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init/Kconfig
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config ARCH string option env="ARCH" config KERNELVERSION string option env="KERNELVERSION" |
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config DEFCONFIG_LIST string |
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depends on !UML |
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option defconfig_list default "/lib/modules/$UNAME_RELEASE/.config" default "/etc/kernel-config" default "/boot/config-$UNAME_RELEASE" |
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default "$ARCH_DEFCONFIG" |
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default "arch/$ARCH/defconfig" |
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config CONSTRUCTORS bool depends on !UML |
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config HAVE_IRQ_WORK bool config IRQ_WORK bool depends on HAVE_IRQ_WORK |
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menu "General setup" |
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config EXPERIMENTAL bool "Prompt for development and/or incomplete code/drivers" ---help--- Some of the various things that Linux supports (such as network drivers, file systems, network protocols, etc.) can be in a state of development where the functionality, stability, or the level of testing is not yet high enough for general use. This is usually known as the "alpha-test" phase among developers. If a feature is currently in alpha-test, then the developers usually discourage uninformed widespread use of this feature by the general public to avoid "Why doesn't this work?" type mail messages. However, active testing and use of these systems is welcomed. Just be aware that it may not meet the normal level of reliability or it may fail to work in some special cases. Detailed bug reports from people familiar with the kernel internals are usually welcomed by the developers (before submitting bug reports, please read the documents <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, <file:Documentation/BUG-HUNTING>, and <file:Documentation/oops-tracing.txt> in the kernel source). This option will also make obsoleted drivers available. These are drivers that have been replaced by something else, and/or are scheduled to be removed in a future kernel release. Unless you intend to help test and develop a feature or driver that falls into this category, or you have a situation that requires using these features, you should probably say N here, which will cause the configurator to present you with fewer choices. If you say Y here, you will be offered the choice of using features or drivers that are currently considered to be in the alpha-test phase. |
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config BROKEN bool |
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config BROKEN_ON_SMP bool depends on BROKEN || !SMP default y |
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config INIT_ENV_ARG_LIMIT int |
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default 32 if !UML default 128 if UML |
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help |
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Maximum of each of the number of arguments and environment variables passed to init from the kernel command line. |
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config CROSS_COMPILE string "Cross-compiler tool prefix" help Same as running 'make CROSS_COMPILE=prefix-' but stored for default make runs in this kernel build directory. You don't need to set this unless you want the configured kernel build directory to select the cross-compiler automatically. |
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config LOCALVERSION string "Local version - append to kernel release" help Append an extra string to the end of your kernel version. This will show up when you type uname, for example. The string you set here will be appended after the contents of any files with a filename matching localversion* in your object and source tree, in that order. Your total string can be a maximum of 64 characters. |
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config LOCALVERSION_AUTO bool "Automatically append version information to the version string" default y help This will try to automatically determine if the current tree is a |
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release tree by looking for git tags that belong to the current top of tree revision. |
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A string of the format -gxxxxxxxx will be added to the localversion |
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if a git-based tree is found. The string generated by this will be |
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appended after any matching localversion* files, and after the value |
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set in CONFIG_LOCALVERSION. |
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(The actual string used here is the first eight characters produced by running the command: $ git rev-parse --verify HEAD which is done within the script "scripts/setlocalversion".) |
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config HAVE_KERNEL_GZIP bool config HAVE_KERNEL_BZIP2 bool config HAVE_KERNEL_LZMA bool |
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config HAVE_KERNEL_XZ bool |
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config HAVE_KERNEL_LZO bool |
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choice |
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prompt "Kernel compression mode" default KERNEL_GZIP |
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depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO |
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help |
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The linux kernel is a kind of self-extracting executable. Several compression algorithms are available, which differ in efficiency, compression and decompression speed. Compression speed is only relevant when building a kernel. Decompression speed is relevant at each boot. If you have any problems with bzip2 or lzma compressed kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older version of this functionality (bzip2 only), for 2.4, was supplied by Christian Ludwig) High compression options are mostly useful for users, who are low on disk space (embedded systems), but for whom ram size matters less. If in doubt, select 'gzip' config KERNEL_GZIP |
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bool "Gzip" depends on HAVE_KERNEL_GZIP help |
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The old and tried gzip compression. It provides a good balance between compression ratio and decompression speed. |
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config KERNEL_BZIP2 bool "Bzip2" |
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depends on HAVE_KERNEL_BZIP2 |
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help Its compression ratio and speed is intermediate. |
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Decompression speed is slowest among the three. The kernel size is about 10% smaller with bzip2, in comparison to gzip. Bzip2 uses a large amount of memory. For modern kernels you will need at least 8MB RAM or more for booting. |
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config KERNEL_LZMA |
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bool "LZMA" depends on HAVE_KERNEL_LZMA help The most recent compression algorithm. Its ratio is best, decompression speed is between the other two. Compression is slowest. The kernel size is about 33% smaller with LZMA in comparison to gzip. |
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config KERNEL_XZ bool "XZ" depends on HAVE_KERNEL_XZ help XZ uses the LZMA2 algorithm and instruction set specific BCJ filters which can improve compression ratio of executable code. The size of the kernel is about 30% smaller with XZ in comparison to gzip. On architectures for which there is a BCJ filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ will create a few percent smaller kernel than plain LZMA. The speed is about the same as with LZMA: The decompression speed of XZ is better than that of bzip2 but worse than gzip and LZO. Compression is slow. |
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config KERNEL_LZO bool "LZO" depends on HAVE_KERNEL_LZO help Its compression ratio is the poorest among the 4. The kernel |
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size is about 10% bigger than gzip; however its speed |
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(both compression and decompression) is the fastest. |
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endchoice |
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config DEFAULT_HOSTNAME string "Default hostname" default "(none)" help This option determines the default system hostname before userspace calls sethostname(2). The kernel traditionally uses "(none)" here, but you may wish to use a different default here to make a minimal system more usable with less configuration. |
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config SWAP bool "Support for paging of anonymous memory (swap)" |
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depends on MMU && BLOCK |
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default y help This option allows you to choose whether you want to have support |
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for so called swap devices or swap files in your kernel that are |
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used to provide more virtual memory than the actual RAM present in your computer. If unsure say Y. config SYSVIPC bool "System V IPC" |
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---help--- Inter Process Communication is a suite of library functions and system calls which let processes (running programs) synchronize and exchange information. It is generally considered to be a good thing, and some programs won't run unless you say Y here. In particular, if you want to run the DOS emulator dosemu under Linux (read the DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), you'll need to say Y here. You can find documentation about IPC with "info ipc" and also in section 6.4 of the Linux Programmer's Guide, available from <http://www.tldp.org/guides.html>. |
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config SYSVIPC_SYSCTL bool depends on SYSVIPC depends on SYSCTL default y |
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config POSIX_MQUEUE bool "POSIX Message Queues" depends on NET && EXPERIMENTAL ---help--- POSIX variant of message queues is a part of IPC. In POSIX message queues every message has a priority which decides about succession of receiving it by a process. If you want to compile and run programs written e.g. for Solaris with use of its POSIX message |
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queues (functions mq_*) say Y here. |
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POSIX message queues are visible as a filesystem called 'mqueue' and can be mounted somewhere if you want to do filesystem operations on message queues. If unsure, say Y. |
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config POSIX_MQUEUE_SYSCTL bool depends on POSIX_MQUEUE depends on SYSCTL default y |
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config BSD_PROCESS_ACCT bool "BSD Process Accounting" help If you say Y here, a user level program will be able to instruct the kernel (via a special system call) to write process accounting information to a file: whenever a process exits, information about that process will be appended to the file by the kernel. The information includes things such as creation time, owning user, command name, memory usage, controlling terminal etc. (the complete list is in the struct acct in <file:include/linux/acct.h>). It is up to the user level program to do useful things with this information. This is generally a good idea, so say Y. config BSD_PROCESS_ACCT_V3 bool "BSD Process Accounting version 3 file format" depends on BSD_PROCESS_ACCT default n help If you say Y here, the process accounting information is written in a new file format that also logs the process IDs of each process and it's parent. Note that this file format is incompatible with previous v0/v1/v2 file formats, so you will need updated tools for processing it. A preliminary version of these tools is available |
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at <http://www.gnu.org/software/acct/>. |
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config FHANDLE bool "open by fhandle syscalls" select EXPORTFS help If you say Y here, a user level program will be able to map file names to handle and then later use the handle for different file system operations. This is useful in implementing userspace file servers, which now track files using handles instead of names. The handle would remain the same even if file names get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2) syscalls. |
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config TASKSTATS bool "Export task/process statistics through netlink (EXPERIMENTAL)" depends on NET default n help Export selected statistics for tasks/processes through the generic netlink interface. Unlike BSD process accounting, the statistics are available during the lifetime of tasks/processes as responses to commands. Like BSD accounting, they are sent to user space on task exit. Say N if unsure. |
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config TASK_DELAY_ACCT bool "Enable per-task delay accounting (EXPERIMENTAL)" |
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depends on TASKSTATS |
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help Collect information on time spent by a task waiting for system resources like cpu, synchronous block I/O completion and swapping in pages. Such statistics can help in setting a task's priorities relative to other tasks for cpu, io, rss limits etc. Say N if unsure. |
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config TASK_XACCT bool "Enable extended accounting over taskstats (EXPERIMENTAL)" depends on TASKSTATS help Collect extended task accounting data and send the data to userland for processing over the taskstats interface. Say N if unsure. config TASK_IO_ACCOUNTING bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" depends on TASK_XACCT help Collect information on the number of bytes of storage I/O which this task has caused. Say N if unsure. |
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config AUDIT bool "Auditing support" |
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depends on NET |
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help Enable auditing infrastructure that can be used with another kernel subsystem, such as SELinux (which requires this for logging of avc messages output). Does not do system-call auditing without CONFIG_AUDITSYSCALL. config AUDITSYSCALL bool "Enable system-call auditing support" |
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depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH) |
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default y if SECURITY_SELINUX help Enable low-overhead system-call auditing infrastructure that can be used independently or with another kernel subsystem, |
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such as SELinux. |
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config AUDIT_WATCH def_bool y depends on AUDITSYSCALL select FSNOTIFY |
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config AUDIT_TREE def_bool y |
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depends on AUDITSYSCALL |
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select FSNOTIFY |
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source "kernel/irq/Kconfig" |
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menu "RCU Subsystem" choice prompt "RCU Implementation" |
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default TREE_RCU |
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config TREE_RCU bool "Tree-based hierarchical RCU" |
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depends on !PREEMPT && SMP |
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help This option selects the RCU implementation that is designed for very large SMP system with hundreds or |
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thousands of CPUs. It also scales down nicely to smaller systems. |
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config TREE_PREEMPT_RCU |
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bool "Preemptible tree-based hierarchical RCU" |
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depends on PREEMPT && SMP |
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help This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response |
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is also required. It also scales down nicely to smaller systems. |
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config TINY_RCU bool "UP-only small-memory-footprint RCU" |
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depends on !PREEMPT && !SMP |
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help This option selects the RCU implementation that is designed for UP systems from which real-time response is not required. This option greatly reduces the memory footprint of RCU. |
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config TINY_PREEMPT_RCU bool "Preemptible UP-only small-memory-footprint RCU" |
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depends on PREEMPT && !SMP |
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help This option selects the RCU implementation that is designed for real-time UP systems. This option greatly reduces the memory footprint of RCU. |
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endchoice |
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config PREEMPT_RCU def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU ) help This option enables preemptible-RCU code that is common between the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations. |
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config RCU_TRACE bool "Enable tracing for RCU" |
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help This option provides tracing in RCU which presents stats in debugfs for debugging RCU implementation. Say Y here if you want to enable RCU tracing Say N if you are unsure. config RCU_FANOUT int "Tree-based hierarchical RCU fanout value" range 2 64 if 64BIT range 2 32 if !64BIT |
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depends on TREE_RCU || TREE_PREEMPT_RCU |
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default 64 if 64BIT default 32 if !64BIT help This option controls the fanout of hierarchical implementations of RCU, allowing RCU to work efficiently on machines with |
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large numbers of CPUs. This value must be at least the fourth root of NR_CPUS, which allows NR_CPUS to be insanely large. The default value of RCU_FANOUT should be used for production systems, but if you are stress-testing the RCU implementation itself, small RCU_FANOUT values allow you to test large-system code paths on small(er) systems. |
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Select a specific number if testing RCU itself. Take the default if unsure. config RCU_FANOUT_EXACT bool "Disable tree-based hierarchical RCU auto-balancing" |
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depends on TREE_RCU || TREE_PREEMPT_RCU |
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default n help This option forces use of the exact RCU_FANOUT value specified, regardless of imbalances in the hierarchy. This is useful for testing RCU itself, and might one day be useful on systems with strong NUMA behavior. Without RCU_FANOUT_EXACT, the code will balance the hierarchy. Say N if unsure. |
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config RCU_FAST_NO_HZ bool "Accelerate last non-dyntick-idle CPU's grace periods" depends on TREE_RCU && NO_HZ && SMP default n help This option causes RCU to attempt to accelerate grace periods in order to allow the final CPU to enter dynticks-idle state more quickly. On the other hand, this option increases the overhead of the dynticks-idle checking, particularly on systems with large numbers of CPUs. Say Y if energy efficiency is critically important, particularly if you have relatively few CPUs. Say N if you are unsure. |
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config TREE_RCU_TRACE |
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def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) |
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select DEBUG_FS help |
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This option provides tracing for the TREE_RCU and TREE_PREEMPT_RCU implementations, permitting Makefile to trivially select kernel/rcutree_trace.c. |
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config RCU_BOOST bool "Enable RCU priority boosting" |
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depends on RT_MUTEXES && PREEMPT_RCU |
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default n help This option boosts the priority of preempted RCU readers that block the current preemptible RCU grace period for too long. This option also prevents heavy loads from blocking RCU callback invocation for all flavors of RCU. Say Y here if you are working with real-time apps or heavy loads Say N here if you are unsure. config RCU_BOOST_PRIO int "Real-time priority to boost RCU readers to" range 1 99 depends on RCU_BOOST default 1 help This option specifies the real-time priority to which preempted RCU readers are to be boosted. If you are working with CPU-bound real-time applications, you should specify a priority higher then the highest-priority CPU-bound application. Specify the real-time priority, or take the default if unsure. config RCU_BOOST_DELAY int "Milliseconds to delay boosting after RCU grace-period start" range 0 3000 depends on RCU_BOOST default 500 help This option specifies the time to wait after the beginning of a given grace period before priority-boosting preempted RCU readers blocking that grace period. Note that any RCU reader blocking an expedited RCU grace period is boosted immediately. Accept the default if unsure. |
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endmenu # "RCU Subsystem" |
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config IKCONFIG |
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tristate "Kernel .config support" |
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---help--- This option enables the complete Linux kernel ".config" file contents to be saved in the kernel. It provides documentation of which kernel options are used in a running kernel or in an on-disk kernel. This information can be extracted from the kernel image file with the script scripts/extract-ikconfig and used as input to rebuild the current kernel or to build another kernel. It can also be extracted from a running kernel by reading /proc/config.gz if enabled (below). config IKCONFIG_PROC bool "Enable access to .config through /proc/config.gz" depends on IKCONFIG && PROC_FS ---help--- This option enables access to the kernel configuration file through /proc/config.gz. |
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config LOG_BUF_SHIFT int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" range 12 21 |
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default 17 |
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help Select kernel log buffer size as a power of 2. |
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Examples: 17 => 128 KB 16 => 64 KB 15 => 32 KB 14 => 16 KB |
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13 => 8 KB 12 => 4 KB |
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# # Architectures with an unreliable sched_clock() should select this: # config HAVE_UNSTABLE_SCHED_CLOCK bool |
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menuconfig CGROUPS boolean "Control Group support" |
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depends on EVENTFD |
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help |
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This option adds support for grouping sets of processes together, for |
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use with process control subsystems such as Cpusets, CFS, memory controls or device isolation. See |
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- Documentation/scheduler/sched-design-CFS.txt (CFS) |
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- Documentation/cgroups/ (features for grouping, isolation and resource control) |
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Say N if unsure. |
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if CGROUPS |
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config CGROUP_DEBUG bool "Example debug cgroup subsystem" |
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default n help This option enables a simple cgroup subsystem that exports useful debugging information about the cgroups |
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framework. |
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Say N if unsure. |
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config CGROUP_FREEZER |
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bool "Freezer cgroup subsystem" |
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help Provides a way to freeze and unfreeze all tasks in a |
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cgroup. config CGROUP_DEVICE bool "Device controller for cgroups" |
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help Provides a cgroup implementing whitelists for devices which a process in the cgroup can mknod or open. config CPUSETS bool "Cpuset support" |
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help This option will let you create and manage CPUSETs which allow dynamically partitioning a system into sets of CPUs and Memory Nodes and assigning tasks to run only within those sets. This is primarily useful on large SMP or NUMA systems. Say N if unsure. |
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config PROC_PID_CPUSET bool "Include legacy /proc/<pid>/cpuset file" depends on CPUSETS default y |
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config CGROUP_CPUACCT bool "Simple CPU accounting cgroup subsystem" |
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help Provides a simple Resource Controller for monitoring the |
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total CPU consumed by the tasks in a cgroup. |
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config RESOURCE_COUNTERS bool "Resource counters" help This option enables controller independent resource accounting |
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infrastructure that works with cgroups. |
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config CGROUP_MEM_RES_CTLR bool "Memory Resource Controller for Control Groups" |
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depends on RESOURCE_COUNTERS |
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select MM_OWNER |
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help |
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606 |
Provides a memory resource controller that manages both anonymous |
21acb9caa
|
607 |
memory and page cache. (See Documentation/cgroups/memory.txt) |
00f0b8259
|
608 609 |
Note that setting this option increases fixed memory overhead |
84ad6d700
|
610 611 612 613 |
associated with each page of memory in the system. By this, 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory usage tracking struct at boot. Total amount of this is printed out at boot. |
00f0b8259
|
614 615 |
Only enable when you're ok with these trade offs and really |
84ad6d700
|
616 617 618 |
sure you need the memory resource controller. Even when you enable this, you can set "cgroup_disable=memory" at your boot option to disable memory resource controller and you can avoid overheads. |
c9d5409f8
|
619 |
(and lose benefits of memory resource controller) |
00f0b8259
|
620 |
|
cf475ad28
|
621 622 |
This config option also selects MM_OWNER config option, which could in turn add some fork/exit overhead. |
c077719be
|
623 |
config CGROUP_MEM_RES_CTLR_SWAP |
65e0e8116
|
624 625 |
bool "Memory Resource Controller Swap Extension" depends on CGROUP_MEM_RES_CTLR && SWAP |
c077719be
|
626 627 628 629 630 631 632 633 634 635 636 |
help Add swap management feature to memory resource controller. When you enable this, you can limit mem+swap usage per cgroup. In other words, when you disable this, memory resource controller has no cares to usage of swap...a process can exhaust all of the swap. This extension is useful when you want to avoid exhaustion swap but this itself adds more overheads and consumes memory for remembering information. Especially if you use 32bit system or small memory system, please be careful about enabling this. When memory resource controller is disabled by boot option, this will be automatically disabled and there will be no overhead from this. Even when you set this config=y, |
00a66d297
|
637 |
if boot option "swapaccount=0" is set, swap will not be accounted. |
627991a20
|
638 639 |
Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page size is 4096bytes, 512k per 1Gbytes of swap. |
a42c390cf
|
640 641 642 643 644 645 646 |
config CGROUP_MEM_RES_CTLR_SWAP_ENABLED bool "Memory Resource Controller Swap Extension enabled by default" depends on CGROUP_MEM_RES_CTLR_SWAP default y help Memory Resource Controller Swap Extension comes with its price in a bigger memory consumption. General purpose distribution kernels |
43d547f9c
|
647 |
which want to enable the feature but keep it disabled by default |
a42c390cf
|
648 649 650 651 |
and let the user enable it by swapaccount boot command line parameter should have this option unselected. For those who want to have the feature enabled by default should select this option (if, for some reason, they need to disable it |
00a66d297
|
652 |
then swapaccount=0 does the trick). |
c077719be
|
653 |
|
e5d1367f1
|
654 655 656 657 658 |
config CGROUP_PERF bool "Enable perf_event per-cpu per-container group (cgroup) monitoring" depends on PERF_EVENTS && CGROUPS help This option extends the per-cpu mode to restrict monitoring to |
2d0f25201
|
659 |
threads which belong to the cgroup specified and run on the |
e5d1367f1
|
660 661 662 |
designated cpu. Say N if unsure. |
7c9414385
|
663 664 |
menuconfig CGROUP_SCHED bool "Group CPU scheduler" |
79ae9c29e
|
665 |
depends on EXPERIMENTAL |
7c9414385
|
666 667 668 669 670 671 672 673 674 675 676 |
default n help This feature lets CPU scheduler recognize task groups and control CPU bandwidth allocation to such task groups. It uses cgroups to group tasks. if CGROUP_SCHED config FAIR_GROUP_SCHED bool "Group scheduling for SCHED_OTHER" depends on CGROUP_SCHED default CGROUP_SCHED |
ab84d31e1
|
677 678 679 680 681 682 683 684 685 686 687 |
config CFS_BANDWIDTH bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED" depends on EXPERIMENTAL depends on FAIR_GROUP_SCHED default n help This option allows users to define CPU bandwidth rates (limits) for tasks running within the fair group scheduler. Groups with no limit set are considered to be unconstrained and will run with no restriction. See tip/Documentation/scheduler/sched-bwc.txt for more information. |
7c9414385
|
688 689 690 691 692 693 694 |
config RT_GROUP_SCHED bool "Group scheduling for SCHED_RR/FIFO" depends on EXPERIMENTAL depends on CGROUP_SCHED default n help This feature lets you explicitly allocate real CPU bandwidth |
32bd7eb5a
|
695 |
to task groups. If enabled, it will also make it impossible to |
7c9414385
|
696 697 698 699 700 |
schedule realtime tasks for non-root users until you allocate realtime bandwidth for them. See Documentation/scheduler/sched-rt-group.txt for more information. endif #CGROUP_SCHED |
afc24d49c
|
701 702 |
config BLK_CGROUP tristate "Block IO controller" |
79ae9c29e
|
703 |
depends on BLOCK |
afc24d49c
|
704 705 706 707 708 709 710 711 |
default n ---help--- Generic block IO controller cgroup interface. This is the common cgroup interface which should be used by various IO controlling policies. Currently, CFQ IO scheduler uses it to recognize task groups and control disk bandwidth allocation (proportional time slice allocation) |
e43473b7f
|
712 713 |
to such task groups. It is also used by bio throttling logic in block layer to implement upper limit in IO rates on a device. |
afc24d49c
|
714 715 |
This option only enables generic Block IO controller infrastructure. |
e43473b7f
|
716 |
One needs to also enable actual IO controlling logic/policy. For |
79e2e7597
|
717 718 |
enabling proportional weight division of disk bandwidth in CFQ, set CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set |
c5e0591ae
|
719 |
CONFIG_BLK_DEV_THROTTLING=y. |
afc24d49c
|
720 721 722 723 724 725 726 727 728 729 |
See Documentation/cgroups/blkio-controller.txt for more information. config DEBUG_BLK_CGROUP bool "Enable Block IO controller debugging" depends on BLK_CGROUP default n ---help--- Enable some debugging help. Currently it exports additional stat files in a cgroup which can be useful for debugging. |
23964d2d0
|
730 |
endif # CGROUPS |
c077719be
|
731 |
|
8dd2a82c2
|
732 |
menuconfig NAMESPACES |
6a108a14f
|
733 734 |
bool "Namespaces support" if EXPERT default !EXPERT |
c5289a694
|
735 736 737 738 739 |
help Provides the way to make tasks work with different objects using the same id. For example same IPC id may refer to different objects or same user id or pid may refer to different tasks when used in different namespaces. |
8dd2a82c2
|
740 |
if NAMESPACES |
58bfdd6de
|
741 742 |
config UTS_NS bool "UTS namespace" |
17a6d4411
|
743 |
default y |
58bfdd6de
|
744 745 746 |
help In this namespace tasks see different info provided with the uname() system call |
ae5e1b22f
|
747 748 |
config IPC_NS bool "IPC namespace" |
8dd2a82c2
|
749 |
depends on (SYSVIPC || POSIX_MQUEUE) |
17a6d4411
|
750 |
default y |
ae5e1b22f
|
751 752 |
help In this namespace tasks work with IPC ids which correspond to |
614b84cf4
|
753 |
different IPC objects in different namespaces. |
ae5e1b22f
|
754 |
|
aee16ce73
|
755 756 |
config USER_NS bool "User namespace (EXPERIMENTAL)" |
8dd2a82c2
|
757 |
depends on EXPERIMENTAL |
17a6d4411
|
758 |
default y |
aee16ce73
|
759 760 761 762 |
help This allows containers, i.e. vservers, to use user namespaces to provide different user info for different servers. If unsure, say N. |
74bd59bb3
|
763 |
config PID_NS |
9bd38c2cd
|
764 |
bool "PID Namespaces" |
17a6d4411
|
765 |
default y |
74bd59bb3
|
766 |
help |
12d2b8f95
|
767 |
Support process id namespaces. This allows having multiple |
692105b8a
|
768 |
processes with the same pid as long as they are in different |
74bd59bb3
|
769 |
pid namespaces. This is a building block of containers. |
d6eb633fe
|
770 771 |
config NET_NS bool "Network namespace" |
8dd2a82c2
|
772 |
depends on NET |
17a6d4411
|
773 |
default y |
d6eb633fe
|
774 775 776 |
help Allow user space to create what appear to be multiple instances of the network stack. |
8dd2a82c2
|
777 |
endif # NAMESPACES |
5091faa44
|
778 779 780 781 782 783 784 785 786 787 788 789 |
config SCHED_AUTOGROUP bool "Automatic process group scheduling" select EVENTFD select CGROUPS select CGROUP_SCHED select FAIR_GROUP_SCHED help This option optimizes the scheduler for common desktop workloads by automatically creating and populating task groups. This separation of workloads isolates aggressive CPU burners (like build jobs) from desktop applications. Task group autogeneration is currently based upon task session. |
7af37bec4
|
790 791 792 793 |
config MM_OWNER bool config SYSFS_DEPRECATED |
5d6a4ea57
|
794 |
bool "Enable deprecated sysfs features to support old userspace tools" |
7af37bec4
|
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 |
depends on SYSFS default n help This option adds code that switches the layout of the "block" class devices, to not show up in /sys/class/block/, but only in /sys/block/. This switch is only active when the sysfs.deprecated=1 boot option is passed or the SYSFS_DEPRECATED_V2 option is set. This option allows new kernels to run on old distributions and tools, which might get confused by /sys/class/block/. Since 2007/2008 all major distributions and tools handle this just fine. Recent distributions and userspace tools after 2009/2010 depend on the existence of /sys/class/block/, and will not work with this option enabled. Only if you are using a new kernel on an old distribution, you might need to say Y here. config SYSFS_DEPRECATED_V2 |
5d6a4ea57
|
817 |
bool "Enable deprecated sysfs features by default" |
7af37bec4
|
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 |
default n depends on SYSFS depends on SYSFS_DEPRECATED help Enable deprecated sysfs by default. See the CONFIG_SYSFS_DEPRECATED option for more details about this option. Only if you are using a new kernel on an old distribution, you might need to say Y here. Even then, odds are you would not need it enabled, you can always pass the boot option if absolutely necessary. config RELAY bool "Kernel->user space relay support (formerly relayfs)" help This option enables support for relay interface support in certain file systems (such as debugfs). It is designed to provide an efficient mechanism for tools and facilities to relay large amounts of data from kernel space to user space. If unsure, say N. |
f991633de
|
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 |
config BLK_DEV_INITRD bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" depends on BROKEN || !FRV help The initial RAM filesystem is a ramfs which is loaded by the boot loader (loadlin or lilo) and that is mounted as root before the normal boot procedure. It is typically used to load modules needed to mount the "real" root file system, etc. See <file:Documentation/initrd.txt> for details. If RAM disk support (BLK_DEV_RAM) is also included, this also enables initial RAM disk (initrd) support and adds 15 Kbytes (more on some other architectures) to the kernel size. If unsure say Y. |
c33df4eaa
|
856 |
if BLK_DEV_INITRD |
dbec48663
|
857 |
source "usr/Kconfig" |
c33df4eaa
|
858 |
endif |
c45b4f1f1
|
859 |
config CC_OPTIMIZE_FOR_SIZE |
96fffeb4b
|
860 |
bool "Optimize for size" |
c45b4f1f1
|
861 862 863 |
help Enabling this option will pass "-Os" instead of "-O2" to gcc resulting in a smaller kernel. |
775a7229a
|
864 |
If unsure, say Y. |
c45b4f1f1
|
865 |
|
0847062ad
|
866 867 |
config SYSCTL bool |
b943c460f
|
868 869 |
config ANON_INODES bool |
6a108a14f
|
870 871 |
menuconfig EXPERT bool "Configure standard kernel features (expert users)" |
f505c553d
|
872 873 |
# Unhide debug options, to make the on-by-default options visible select DEBUG_KERNEL |
1da177e4c
|
874 875 876 877 878 |
help This option allows certain base kernel options and settings to be disabled or tweaked. This is for specialized environments which can tolerate a "non-standard" kernel. Only use this if you really know what you are doing. |
ae81f9e37
|
879 |
config UID16 |
6a108a14f
|
880 |
bool "Enable 16-bit UID system calls" if EXPERT |
09337f501
|
881 |
depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) |
ae81f9e37
|
882 883 884 |
default y help This enables the legacy 16-bit UID syscall wrappers. |
b89a81712
|
885 |
config SYSCTL_SYSCALL |
6a108a14f
|
886 |
bool "Sysctl syscall support" if EXPERT |
26a7034b4
|
887 |
depends on PROC_SYSCTL |
c736de60a
|
888 |
default n |
b89a81712
|
889 |
select SYSCTL |
ae81f9e37
|
890 |
---help--- |
13bb7e37e
|
891 892 893 894 |
sys_sysctl uses binary paths that have been found challenging to properly maintain and use. The interface in /proc/sys using paths with ascii names is now the primary path to this information. |
b89a81712
|
895 |
|
13bb7e37e
|
896 897 898 |
Almost nothing using the binary sysctl interface so if you are trying to save some space it is probably safe to disable this, making your kernel marginally smaller. |
b89a81712
|
899 |
|
c736de60a
|
900 |
If unsure say N here. |
ae81f9e37
|
901 |
|
1da177e4c
|
902 |
config KALLSYMS |
6a108a14f
|
903 |
bool "Load all symbols for debugging/ksymoops" if EXPERT |
1da177e4c
|
904 905 906 907 908 909 910 911 912 913 |
default y help Say Y here to let the kernel print out symbolic crash information and symbolic stack backtraces. This increases the size of the kernel somewhat, as all symbols have to be loaded into the kernel image. config KALLSYMS_ALL bool "Include all symbols in kallsyms" depends on DEBUG_KERNEL && KALLSYMS help |
71a83ec7d
|
914 915 916 917 918 919 920 921 922 923 924 925 |
Normally kallsyms only contains the symbols of functions for nicer OOPS messages and backtraces (i.e., symbols from the text and inittext sections). This is sufficient for most cases. And only in very rare cases (e.g., when a debugger is used) all symbols are required (e.g., names of variables from the data sections, etc). This option makes sure that all symbols are loaded into the kernel image (i.e., symbols from all sections) in cost of increased kernel size (depending on the kernel configuration, it may be 300KiB or something like this). Say N unless you really need all symbols. |
d59745ce3
|
926 |
|
712f47cea
|
927 |
config HOTPLUG |
6a108a14f
|
928 |
bool "Support for hot-pluggable devices" if EXPERT |
712f47cea
|
929 930 931 932 933 934 |
default y help This option is provided for the case where no hotplug or uevent capabilities is wanted by the kernel. You should only consider disabling this option for embedded systems that do not use modules, a dynamic /dev tree, or dynamic device discovery. Just say Y. |
d59745ce3
|
935 936 |
config PRINTK default y |
6a108a14f
|
937 |
bool "Enable support for printk" if EXPERT |
d59745ce3
|
938 939 940 941 942 943 |
help This option enables normal printk support. Removing it eliminates most of the message strings from the kernel image and makes the kernel more or less silent. As this makes it very difficult to diagnose system problems, saying N here is strongly discouraged. |
c8538a7aa
|
944 |
config BUG |
6a108a14f
|
945 |
bool "BUG() support" if EXPERT |
c8538a7aa
|
946 947 948 949 950 951 952 |
default y help Disabling this option eliminates support for BUG and WARN, reducing the size of your kernel image and potentially quietly ignoring numerous fatal conditions. You should only consider disabling this option for embedded systems with no facilities for reporting errors. Just say Y. |
708e9a794
|
953 954 |
config ELF_CORE default y |
6a108a14f
|
955 |
bool "Enable ELF core dumps" if EXPERT |
708e9a794
|
956 957 |
help Enable support for generating core dumps. Disabling saves about 4k. |
8761f1ab7
|
958 |
|
e5e1d3cb2
|
959 |
config PCSPKR_PLATFORM |
6a108a14f
|
960 |
bool "Enable PC-Speaker support" if EXPERT |
8761f1ab7
|
961 |
depends on HAVE_PCSPKR_PLATFORM |
15f304b66
|
962 |
select I8253_LOCK |
e5e1d3cb2
|
963 964 965 966 |
default y help This option allows to disable the internal PC-Speaker support, saving some memory. |
8761f1ab7
|
967 968 |
config HAVE_PCSPKR_PLATFORM bool |
1da177e4c
|
969 970 |
config BASE_FULL default y |
6a108a14f
|
971 |
bool "Enable full-sized data structures for core" if EXPERT |
1da177e4c
|
972 973 974 975 976 977 |
help Disabling this option reduces the size of miscellaneous core kernel data structures. This saves memory on small machines, but may reduce performance. config FUTEX |
6a108a14f
|
978 |
bool "Enable futex support" if EXPERT |
1da177e4c
|
979 |
default y |
23f78d4a0
|
980 |
select RT_MUTEXES |
1da177e4c
|
981 982 983 984 985 986 |
help Disabling this option will cause the kernel to be built without support for "fast userspace mutexes". The resulting kernel may not run glibc-based applications correctly. config EPOLL |
6a108a14f
|
987 |
bool "Enable eventpoll support" if EXPERT |
1da177e4c
|
988 |
default y |
448e3cee8
|
989 |
select ANON_INODES |
1da177e4c
|
990 991 992 |
help Disabling this option will cause the kernel to be built without support for epoll family of system calls. |
fba2afaae
|
993 |
config SIGNALFD |
6a108a14f
|
994 |
bool "Enable signalfd() system call" if EXPERT |
448e3cee8
|
995 |
select ANON_INODES |
fba2afaae
|
996 997 998 999 1000 1001 |
default y help Enable the signalfd() system call that allows to receive signals on a file descriptor. If unsure, say Y. |
b215e2839
|
1002 |
config TIMERFD |
6a108a14f
|
1003 |
bool "Enable timerfd() system call" if EXPERT |
448e3cee8
|
1004 |
select ANON_INODES |
b215e2839
|
1005 1006 1007 1008 1009 1010 |
default y help Enable the timerfd() system call that allows to receive timer events on a file descriptor. If unsure, say Y. |
e1ad7468c
|
1011 |
config EVENTFD |
6a108a14f
|
1012 |
bool "Enable eventfd() system call" if EXPERT |
448e3cee8
|
1013 |
select ANON_INODES |
e1ad7468c
|
1014 1015 1016 1017 1018 1019 |
default y help Enable the eventfd() system call that allows to receive both kernel notification (ie. KAIO) or userspace notifications. If unsure, say Y. |
1da177e4c
|
1020 |
config SHMEM |
6a108a14f
|
1021 |
bool "Use full shmem filesystem" if EXPERT |
1da177e4c
|
1022 1023 1024 1025 1026 1027 1028 1029 |
default y depends on MMU help The shmem is an internal filesystem used to manage shared memory. It is backed by swap and manages resource limits. It is also exported to userspace as tmpfs if TMPFS is enabled. Disabling this option replaces shmem and tmpfs with the much simpler ramfs code, which may be appropriate on small systems without swap. |
ebf3f09c6
|
1030 |
config AIO |
6a108a14f
|
1031 |
bool "Enable AIO support" if EXPERT |
ebf3f09c6
|
1032 1033 1034 1035 1036 |
default y help This option enables POSIX asynchronous I/O which may by used by some high performance threaded applications. Disabling this option saves about 7k. |
6befe5f69
|
1037 1038 1039 1040 1041 1042 1043 |
config EMBEDDED bool "Embedded system" select EXPERT help This option should be enabled if compiling the kernel for an embedded system so certain expert options are available for configuration. |
cdd6c482c
|
1044 |
config HAVE_PERF_EVENTS |
0793a61d4
|
1045 |
bool |
018df72dd
|
1046 1047 |
help See tools/perf/design.txt for details. |
0793a61d4
|
1048 |
|
906010b21
|
1049 1050 1051 1052 |
config PERF_USE_VMALLOC bool help See tools/perf/design.txt for details |
57c0c15b5
|
1053 |
menu "Kernel Performance Events And Counters" |
0793a61d4
|
1054 |
|
cdd6c482c
|
1055 |
config PERF_EVENTS |
57c0c15b5
|
1056 1057 |
bool "Kernel performance events and counters" default y if (PROFILING || PERF_COUNTERS) |
cdd6c482c
|
1058 |
depends on HAVE_PERF_EVENTS |
4c59e4676
|
1059 |
select ANON_INODES |
e360adbe2
|
1060 |
select IRQ_WORK |
0793a61d4
|
1061 |
help |
57c0c15b5
|
1062 1063 |
Enable kernel support for various performance events provided by software and hardware. |
0793a61d4
|
1064 |
|
dd77038d2
|
1065 |
Software events are supported either built-in or via the |
57c0c15b5
|
1066 |
use of generic tracepoints. |
0793a61d4
|
1067 |
|
57c0c15b5
|
1068 1069 |
Most modern CPUs support performance events via performance counter registers. These registers count the number of certain |
0793a61d4
|
1070 1071 1072 1073 1074 |
types of hw events: such as instructions executed, cachemisses suffered, or branches mis-predicted - without slowing down the kernel or applications. These registers can also trigger interrupts when a threshold number of events have passed - and can thus be used to profile the code that runs on that CPU. |
57c0c15b5
|
1075 |
The Linux Performance Event subsystem provides an abstraction of |
dd77038d2
|
1076 |
these software and hardware event capabilities, available via a |
57c0c15b5
|
1077 |
system call and used by the "perf" utility in tools/perf/. It |
0793a61d4
|
1078 1079 1080 1081 |
provides per task and per CPU counters, and it provides event capabilities on top of those. Say Y if unsure. |
57c0c15b5
|
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 |
config PERF_COUNTERS bool "Kernel performance counters (old config option)" depends on HAVE_PERF_EVENTS help This config has been obsoleted by the PERF_EVENTS config option - please see that one for details. It has no effect on the kernel whether you enable it or not, it is a compatibility placeholder. Say N if unsure. |
906010b21
|
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 |
config DEBUG_PERF_USE_VMALLOC default n bool "Debug: use vmalloc to back perf mmap() buffers" depends on PERF_EVENTS && DEBUG_KERNEL select PERF_USE_VMALLOC help Use vmalloc memory to back perf mmap() buffers. Mostly useful for debugging the vmalloc code on platforms that don't require it. Say N if unsure. |
0793a61d4
|
1105 |
endmenu |
f8891e5e1
|
1106 1107 |
config VM_EVENT_COUNTERS default y |
6a108a14f
|
1108 |
bool "Enable VM event counters for /proc/vmstat" if EXPERT |
f8891e5e1
|
1109 |
help |
2aea4fb61
|
1110 1111 |
VM event counters are needed for event counts to be shown. This option allows the disabling of the VM event counters |
6a108a14f
|
1112 |
on EXPERT systems. /proc/vmstat will only show page counts |
2aea4fb61
|
1113 |
if VM event counters are disabled. |
f8891e5e1
|
1114 |
|
3d1373102
|
1115 1116 |
config PCI_QUIRKS default y |
6a108a14f
|
1117 |
bool "Enable PCI quirk workarounds" if EXPERT |
61cfc7e44
|
1118 |
depends on PCI |
3d1373102
|
1119 1120 1121 1122 |
help This enables workarounds for various PCI chipset bugs/quirks. Disable this only if your target machine is unaffected by PCI quirks. |
41ecc55b8
|
1123 1124 |
config SLUB_DEBUG default y |
6a108a14f
|
1125 |
bool "Enable SLUB debugging support" if EXPERT |
f6acb6350
|
1126 |
depends on SLUB && SYSFS |
41ecc55b8
|
1127 1128 1129 1130 1131 |
help SLUB has extensive debug support features. Disabling these can result in significant savings in code size. This also disables SLUB sysfs support. /sys/slab will not exist and there will be no support for cache validation etc. |
b943c460f
|
1132 1133 1134 1135 1136 1137 1138 |
config COMPAT_BRK bool "Disable heap randomization" default y help Randomizing heap placement makes heap exploits harder, but it also breaks ancient binaries (including anything libc5 based). This option changes the bootup default to heap randomization |
692105b8a
|
1139 |
disabled, and can be overridden at runtime by setting |
b943c460f
|
1140 1141 1142 |
/proc/sys/kernel/randomize_va_space to 2. On non-ancient distros (post-2000 ones) N is usually a safe choice. |
81819f0fc
|
1143 1144 |
choice prompt "Choose SLAB allocator" |
a0acd8208
|
1145 |
default SLUB |
81819f0fc
|
1146 1147 1148 1149 1150 1151 1152 |
help This option allows to select a slab allocator. config SLAB bool "SLAB" help The regular slab allocator that is established and known to work |
34013886e
|
1153 |
well in all environments. It organizes cache hot objects in |
02f562104
|
1154 |
per cpu and per node queues. |
81819f0fc
|
1155 1156 |
config SLUB |
81819f0fc
|
1157 1158 1159 1160 1161 1162 |
bool "SLUB (Unqueued Allocator)" help SLUB is a slab allocator that minimizes cache line usage instead of managing queues of cached objects (SLAB approach). Per cpu caching is realized using slabs of objects instead of queues of objects. SLUB can use memory efficiently |
02f562104
|
1163 1164 |
and has enhanced diagnostics. SLUB is the default choice for a slab allocator. |
81819f0fc
|
1165 1166 |
config SLOB |
6a108a14f
|
1167 |
depends on EXPERT |
81819f0fc
|
1168 1169 |
bool "SLOB (Simple Allocator)" help |
372914582
|
1170 1171 1172 |
SLOB replaces the stock allocator with a drastically simpler allocator. SLOB is generally more space efficient but does not perform as well on large systems. |
81819f0fc
|
1173 1174 |
endchoice |
ea6376395
|
1175 1176 |
config MMAP_ALLOW_UNINITIALIZED bool "Allow mmapped anonymous memory to be uninitialized" |
6a108a14f
|
1177 |
depends on EXPERT && !MMU |
ea6376395
|
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 |
default n help Normally, and according to the Linux spec, anonymous memory obtained from mmap() has it's contents cleared before it is passed to userspace. Enabling this config option allows you to request that mmap() skip that if it is given an MAP_UNINITIALIZED flag, thus providing a huge performance boost. If this option is not enabled, then the flag will be ignored. This is taken advantage of by uClibc's malloc(), and also by ELF-FDPIC binfmt's brk and stack allocator. Because of the obvious security issues, this option should only be enabled on embedded devices where you control what is run in userspace. Since that isn't generally a problem on no-MMU systems, it is normally safe to say Y here. See Documentation/nommu-mmap.txt for more information. |
125e56458
|
1196 |
config PROFILING |
b309a294e
|
1197 |
bool "Profiling support" |
125e56458
|
1198 1199 1200 |
help Say Y here to enable the extended profiling support mechanisms used by profilers such as OProfile. |
5f87f1121
|
1201 1202 1203 1204 |
# # Place an empty function call at each tracepoint site. Can be # dynamically changed for a probe function. # |
97e1c18e8
|
1205 |
config TRACEPOINTS |
5f87f1121
|
1206 |
bool |
97e1c18e8
|
1207 |
|
fb32e03fd
|
1208 |
source "arch/Kconfig" |
1da177e4c
|
1209 |
endmenu # General setup |
ee7e5516b
|
1210 1211 1212 |
config HAVE_GENERIC_DMA_COHERENT bool default n |
158a96242
|
1213 1214 1215 |
config SLABINFO bool depends on PROC_FS |
0f389ec63
|
1216 |
depends on SLAB || SLUB_DEBUG |
158a96242
|
1217 |
default y |
ae81f9e37
|
1218 1219 |
config RT_MUTEXES boolean |
ae81f9e37
|
1220 |
|
1da177e4c
|
1221 1222 1223 1224 |
config BASE_SMALL int default 0 if BASE_FULL default 1 if !BASE_FULL |
66da57332
|
1225 |
menuconfig MODULES |
1da177e4c
|
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 |
bool "Enable loadable module support" help Kernel modules are small pieces of compiled code which can be inserted in the running kernel, rather than being permanently built into the kernel. You use the "modprobe" tool to add (and sometimes remove) them. If you say Y here, many parts of the kernel can be built as modules (by answering M instead of Y where indicated): this is most useful for infrequently used options which are not required for booting. For more information, see the man pages for modprobe, lsmod, modinfo, insmod and rmmod. If you say Y here, you will need to run "make modules_install" to put the modules under /lib/modules/ where modprobe can find them (you may need to be root to do this). If unsure, say Y. |
0b0de1443
|
1244 |
if MODULES |
826e4506a
|
1245 1246 |
config MODULE_FORCE_LOAD bool "Forced module loading" |
826e4506a
|
1247 1248 |
default n help |
91e37a793
|
1249 1250 1251 |
Allow loading of modules without version information (ie. modprobe --force). Forced module loading sets the 'F' (forced) taint flag and is usually a really bad idea. |
826e4506a
|
1252 |
|
1da177e4c
|
1253 1254 |
config MODULE_UNLOAD bool "Module unloading" |
1da177e4c
|
1255 1256 1257 |
help Without this option you will not be able to unload any modules (note that some modules may not be unloadable |
f7f5b6755
|
1258 1259 |
anyway), which makes your kernel smaller, faster and simpler. If unsure, say Y. |
1da177e4c
|
1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 |
config MODULE_FORCE_UNLOAD bool "Forced module unloading" depends on MODULE_UNLOAD && EXPERIMENTAL help This option allows you to force a module to unload, even if the kernel believes it is unsafe: the kernel will remove the module without waiting for anyone to stop using it (using the -f option to rmmod). This is mainly for kernel developers and desperate users. If unsure, say N. |
1da177e4c
|
1270 |
config MODVERSIONS |
0d5416433
|
1271 |
bool "Module versioning support" |
1da177e4c
|
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 |
help Usually, you have to use modules compiled with your kernel. Saying Y here makes it sometimes possible to use modules compiled for different kernels, by adding enough information to the modules to (hopefully) spot any changes which would make them incompatible with the kernel you are running. If unsure, say N. config MODULE_SRCVERSION_ALL bool "Source checksum for all modules" |
1da177e4c
|
1282 1283 1284 1285 1286 1287 1288 1289 |
help Modules which contain a MODULE_VERSION get an extra "srcversion" field inserted into their modinfo section, which contains a sum of the source files which made it. This helps maintainers see exactly which source was used to build a module (since others sometimes change the module source without updating the version). With this option, such a "srcversion" field will be created for all modules. If unsure, say N. |
0b0de1443
|
1290 |
endif # MODULES |
98a79d6a5
|
1291 1292 1293 1294 1295 1296 1297 |
config INIT_ALL_POSSIBLE bool help Back when each arch used to define their own cpu_online_map and cpu_possible_map, some of them chose to initialize cpu_possible_map with all 1s, and others with all 0s. When they were centralised, it was better to provide this option than to break all the archs |
692105b8a
|
1298 |
and have several arch maintainers pursuing me down dark alleys. |
98a79d6a5
|
1299 |
|
1da177e4c
|
1300 1301 1302 1303 1304 1305 |
config STOP_MACHINE bool default y depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU help Need stop_machine() primitive. |
3a65dfe8c
|
1306 |
|
3a65dfe8c
|
1307 |
source "block/Kconfig" |
e98c32029
|
1308 1309 1310 |
config PREEMPT_NOTIFIERS bool |
e260be673
|
1311 |
|
16295bec6
|
1312 1313 1314 |
config PADATA depends on SMP bool |
6beb00092
|
1315 |
source "kernel/Kconfig.locks" |