24 Apr, 2008
2 commits
-
Use the __weak macro instead of the longer __attribute__ ((weak)) form
in one place in init/main.c.Signed-off-by: Benjamin Herrenschmidt
Acked-by: Andrew Morton
--init/main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Signed-off-by: Paul Mackerras -
Some architectures need to maintain a kmem cache for thread info
structures. The next commit adds that to powerpc to fix an alignment
problem.There is no good arch callback to use to initialize that cache
that I can find, so this adds a new one in the form of a weak
function whose default is empty.Signed-off-by: Benjamin Herrenschmidt
Acked-by: Andrew Morton
Signed-off-by: Paul Mackerras
20 Apr, 2008
2 commits
-
Move the setting of nr_cpu_ids from sched_init() to start_kernel()
so that it's available as early as possible.Note that an arch has the option of setting it even earlier if need be,
but it should not result in a different value than the setup_nr_cpu_ids()
function.Signed-off-by: Mike Travis
Signed-off-by: Ingo Molnar -
* Add a static cpumask_t variable "CPU_MASK_ALL_PTR" to use as
a pointer reference to CPU_MASK_ALL. This reduces where possible
the instances where CPU_MASK_ALL allocates and fills a large
array on the stack. Used only if NR_CPUS > BITS_PER_LONG.* Change init/main.c to use new set_cpus_allowed_ptr().
Depends on:
[sched-devel]: sched: add new set_cpus_allowed_ptr functionCc: H. Peter Anvin
Signed-off-by: Mike Travis
Signed-off-by: Ingo Molnar
16 Mar, 2008
1 commit
-
This essentially reverts commit 71fc47a9adf8ee89e5c96a47222915c5485ac437
("ACPI: basic initramfs DSDT override support"), because the code simply
isn't ready.It did ugly things to the init sequence to populate the rootfs image
early, but that just ended up showing other problems with the whole
approach. The fact is, the VFS layer simply isn't initialized this
early, and the relevant ACPI code should either run much later, or this
shouldn't be done at all.For 2.6.25, we'll just pick the latter option. We can revisit this
concept later if necessary.Cc: Dave Hansen
Cc: Tilman Schmidt
Cc: Andrew Morton
Cc: Thomas Renninger
Cc: Eric Piel
Cc: Len Brown
Cc: Christoph Hellwig
Cc: Markus Gaugusch
Signed-off-by: Linus Torvalds
05 Mar, 2008
1 commit
-
Keith Mannthey said:
The parameter hotadd_percent is setup right but there is a "Malformed
early option 'numa'" message.Rusty Russell said:
This happens when the function registered with early_param() returns
non-zero. __setup() functions return 1 if OK, module_param() and
early_param() return 0 or a -ve error code.For instance:
Linux version 2.6.25-rc3-t (raa@steel) (gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)) #22 SMP PREEMPT Tue Feb 26
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000003fff0000 (usable)
BIOS-e820: 000000003fff0000 - 000000003fff3000 (ACPI NVS)
BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data)
BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
Malformed early option 'loglevel'
127MB HIGHMEM available.
896MB LOWMEM available.Command line:
BOOT_IMAGE=2.6.25-t ro root=809 ro console=ttyS0,57600n8 console=tty0 loglevel=5
Acked-by: Yinghai Lu
Cc: Rusty Russell
Cc: Keith Mannthey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
10 Feb, 2008
1 commit
-
DEBUG_PAGEALLOC must not be enabled before mem_init(). Before this
point there is nothing to allocate.Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar
09 Feb, 2008
3 commits
-
So we can use them for the early console like console=uart8250 or
earlycon=uart8250 or early_printkSigned-off-by: Yinghai Lu
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
As Eric pointed out, there is no problem with init starting with sid == pgid
== 0, and this was historical linux behavior changed in 2.6.18.Remove kernel_init()->__set_special_pids(), this is unneeded and complicates
the rules for sys_setsid().This change and the previous change in daemonize() mean that /sbin/init does
not need the special "session != 1" hack in sys_setsid() any longer. We can't
remove this check yet, we should cleanup copy_process(CLONE_NEWPID) first, so
update the comment only.Signed-off-by: Oleg Nesterov
Acked-by: "Eric W. Biederman"
Cc: Pavel Emelyanov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Change set_special_pids() to work with struct pid, not pid_t from global name
space. This again speedups and imho cleanups the code, also a preparation for
the next patch.Signed-off-by: Oleg Nesterov
Acked-by: "Eric W. Biederman"
Acked-by: Pavel Emelyanov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Feb, 2008
2 commits
-
The basics of DSDT from initramfs. In case this option is selected,
populate_rootfs() is called a bit earlier to have the initramfs content
available during ACPI initialization.This is a very similar path to the one available at
http://gaugusch.at/kernel.shtml but with some update in the
documentation, default set to No and the change of populate_rootfs() the
"Jeff Mahony way" (which avoids reading the initramfs twice).Signed-off-by: Thomas Renninger
Signed-off-by: Eric Piel
Signed-off-by: Len Brown -
Add a proper prototype for signals_init() in include/linux/signal.h
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Jan, 2008
4 commits
-
get more testing of the c_p_a() code done by not turning off
PSE on DEBUG_PAGEALLOC.this simplifies the early pagetable setup code, and tests
the largepage-splitup code quite heavily.In the end, all the largepages will be split up pretty quickly,
so there's no difference to how DEBUG_PAGEALLOC worked before.Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
On VMs implemented using JITs that cache translated code changing the lock
prefixes is a quite costly operation that forces the JIT to throw away and
retranslate a lot of code.Previously a SMP kernel would rewrite the locks once for each CPU which
is quite unnecessary. This patch changes the code to never switch at boot in
the normal case (SMP kernel booting with >1 CPU) or only once for SMP kernel
on UP.This makes a significant difference in boot up performance on AMD SimNow!
Also I expect it to be a little faster on native systems too because a smp
switch does a lot of text_poke()s which each synchronize the pipeline.v1->v2: Rename max_cpus
v1->v2: Fix off by one in UP check (Thomas Gleixner)Signed-off-by: Andi Kleen
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner -
The use of the __GENERIC_PERCPU is a bit problematic since arches
may want to run their own percpu setup while using the generic
percpu definitions. Replace it through a kconfig variable.Cc: Rusty Russell
Cc: Andi Kleen
Signed-off-by: Christoph Lameter
Signed-off-by: Mike Travis
Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar
26 Jan, 2008
1 commit
-
This patch implements a Refcount + Waitqueue based model for
cpu-hotplug.Now, a thread which wants to prevent cpu-hotplug, will bump up a global
refcount and the thread which wants to perform a cpu-hotplug operation
will block till the global refcount goes to zero.The readers, if any, during an ongoing cpu-hotplug operation are blocked
until the cpu-hotplug operation is over.Signed-off-by: Gautham R Shenoy
Signed-off-by: Paul Jackson [For !CONFIG_HOTPLUG_CPU ]
Signed-off-by: Ingo Molnar
10 Nov, 2007
1 commit
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This patch adds a proper prototype for migration_init() in
include/linux/sched.hSince there's no point in always returning 0 to a caller that doesn't check
the return value it also changes the function to return void.Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Ingo Molnar
20 Oct, 2007
3 commits
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Spelling fix in init/.
Signed-off-by: Simon Arlott
Signed-off-by: Adrian Bunk -
The header file already enforces a suitably recent
version of gcc, so there's no point checking for that again.Signed-off-by: Robert P. J. Day
Signed-off-by: Adrian Bunk -
Generic Process Control Groups
--------------------------There have recently been various proposals floating around for
resource management/accounting and other task grouping subsystems in
the kernel, including ResGroups, User BeanCounters, NSProxy
cgroups, and others. These all need the basic abstraction of being
able to group together multiple processes in an aggregate, in order to
track/limit the resources permitted to those processes, or control
other behaviour of the processes, and all implement this grouping in
different ways.This patchset provides a framework for tracking and grouping processes
into arbitrary "cgroups" and assigning arbitrary state to those
groupings, in order to control the behaviour of the cgroup as an
aggregate.The intention is that the various resource management and
virtualization/cgroup efforts can also become task cgroup
clients, with the result that:- the userspace APIs are (somewhat) normalised
- it's easier to test e.g. the ResGroups CPU controller in
conjunction with the BeanCounters memory controller, or use either of
them as the resource-control portion of a virtual server system.- the additional kernel footprint of any of the competing resource
management systems is substantially reduced, since it doesn't need
to provide process grouping/containment, hence improving their
chances of getting into the kernelThis patch:
Add the main task cgroups framework - the cgroup filesystem, and the
basic structures for tracking membership and associating subsystem state
objects to tasks.Signed-off-by: Paul Menage
Cc: Serge E. Hallyn
Cc: "Eric W. Biederman"
Cc: Dave Hansen
Cc: Balbir Singh
Cc: Paul Jackson
Cc: Kirill Korotaev
Cc: Herbert Poetzl
Cc: Srivatsa Vaddagiri
Cc: Cedric Le Goater
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
31 Aug, 2007
1 commit
-
Alexey Dobriyan reports that maxcpus=1 is still broken in 2.6.23-rc4:
if CONFIG_HOTPLUG_CPU is not set, x86_64 bootup oopses in show_stat() -
for_each_possible_cpu accesses a per-cpu area which was never set up.Alexey identified commit 61ec7567db103d537329b0db9a887db570431ff4
(ACPI: boot correctly with "nosmp" or "maxcpus=0") as the origin;
but it's not really to blame, just exposes a bug in 2.6.23-rc1's commit
8b3b295502444340dd0701855ac422fbf32e161d (Especially when !CONFIG_HOTPLUG_CPU,
avoid needlessy allocating resources for CPUs that can never become available).rc1's test for max_cpus < 2 in start_kernel() wasn't working because
max_cpus was still NR_CPUS at that point: until rc4 moved the maxcpus
parsing earlier. Now it sets cpu_possible_map to 1 before allocating
all possible per-cpu areas; then smp_init() expands cpu_possible_map
to cpu_present_map (0xf in my case) later on.rc1's commit has good intentions, but expects cpu_present_map to be
limited by maxcpus, which is only the case on i386. cpus_and(possible,
possible,present) might be good, but needs an audit of cpu_present_map
uses - there may well be assumptions that any cpu present is possible.So stay safe for now and just revert those #ifndef CONFIG_HOTPLUG_CPU
optimizations in rc1's commit.Signed-off-by: Hugh Dickins
Cc: Alexey Dobriyan
Cc: Len Brown
Cc: Andrew Morton
Cc: Jan Beulich
Signed-off-by: Linus Torvalds
28 Aug, 2007
1 commit
-
Commit 61ec7567db103d537329b0db9a887db570431ff4 ('ACPI: boot correctly
with "nosmp" or "maxcpus=0"') broke 'maxcpus=' handling on x86[-64].maxcpus=N is now having no effect on x86_64, and freezing bootup on i386
(because of inconsistency with the separate maxcpus parsing down in
arch/i386, I guess). That's because early_param parsing is a little
different from __setup parsing, and needs the "=" omitted: then it seems
to work as the original commit intended (no mention of IO-APIC in
/proc/interrupts when maxcpus=0).Signed-off-by: Hugh Dickins
Cc: Andrew Morton
Cc: Len Brown
Cc: Andi Kleen
Cc: Rusty Russell
Signed-off-by: Linus Torvalds
21 Aug, 2007
1 commit
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In MPS mode, "nosmp" and "maxcpus=0" boot a UP kernel with IOAPIC disabled.
However, in ACPI mode, these parameters didn't completely disable
the IO APIC initialization code and boot failed.init/main.c:
Disable the IO_APIC if "nosmp" or "maxcpus=0"
undefine disable_ioapic_setup() when it doesn't apply.i386:
delete ioapic_setup(), it was a duplicate of parse_noapic()
delete undefinition of disable_ioapic_setup()x86_64:
rename disable_ioapic_setup() to parse_noapic() to match i386
define disable_ioapic_setup() in header to match i386http://bugzilla.kernel.org/show_bug.cgi?id=1641
Acked-by: Andi Kleen
Signed-off-by: Len Brown
17 Jul, 2007
3 commits
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Especially when !CONFIG_HOTPLUG_CPU, avoid needlessy allocating resources for
CPUs that can never become available.Signed-off-by: Jan Beulich
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
It's useful sometimes to disable the softlockup checker at boottime.
Especially if it triggers during a distro install.Signed-off-by: Dave Jones
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Beacuse SERIAL_PORT_DFNS is removed from include/asm-i386/serial.h and
include/asm-x86_64/serial.h. the serial8250_ports need to be probed late in
serial initializing stage. the console_init=>serial8250_console_init=>
register_console=>serial8250_console_setup will return -ENDEV, and console
ttyS0 can not be enabled at that time. need to wait till uart_add_one_port in
drivers/serial/serial_core.c to call register_console to get console ttyS0.
that is too late.Make early_uart to use early_param, so uart console can be used earlier. Make
it to be bootconsole with CON_BOOT flag, so can use console handover feature.
and it will switch to corresponding normal serial console automatically.new command line will be:
console=uart8250,io,0x3f8,9600n8
console=uart8250,mmio,0xff5e0000,115200n8
or
earlycon=uart8250,io,0x3f8,9600n8
earlycon=uart8250,mmio,0xff5e0000,115200n8it will print in very early stage:
Early serial console at I/O port 0x3f8 (options '9600n8')
console [uart0] enabled
later for console it will print:
console handover: boot [uart0] -> real [ttyS0]Signed-off-by:
Cc: Andi Kleen
Cc: Bjorn Helgaas
Cc: Russell King
Cc: Gerd Hoffmann
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
10 Jul, 2007
1 commit
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add the init_idle_bootup_task() callback to the bootup thread,
unused at the moment. (CFS will use it to switch the scheduling
class of the boot thread to the idle class)Signed-off-by: Ingo Molnar
19 May, 2007
1 commit
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Kill a special case in modpost by introducing the
__init_refok marker.Signed-off-by: Sam Ravnborg
11 May, 2007
1 commit
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Explicitly set pgid and sid of init process to 1.
Signed-off-by: Sukadev Bhattiprolu
Cc: Cedric Le Goater
Cc: Dave Hansen
Cc: Serge Hallyn
Cc: Eric Biederman
Cc: Herbert Poetzl
Cc:
Acked-by: Eric W. Biederman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
10 May, 2007
1 commit
-
Currently there is a circular reference between work queue initialization
and kthread initialization. This prevents the kthread infrastructure from
initializing until after work queues have been initialized.We want the properties of tasks created with kthread_create to be as close
as possible to the init_task and to not be contaminated by user processes.
The later we start our kthreadd that creates these tasks the harder it is
to avoid contamination from user processes and the more of a mess we have
to clean up because the defaults have changed on us.So this patch modifies the kthread support to not use work queues but to
instead use a simple list of structures, and to have kthreadd start from
init_task immediately after our kernel thread that execs /sbin/init.By being a true child of init_task we only have to change those process
settings that we want to have different from init_task, such as our process
name, the cpus that are allowed, blocking all signals and setting SIGCHLD
to SIG_IGN so that all of our children are reaped automatically.By being a true child of init_task we also naturally get our ppid set to 0
and do not wind up as a child of PID == 1. Ensuring that tasks generated
by kthread_create will not slow down the functioning of the wait family of
functions.[akpm@linux-foundation.org: use interruptible sleeps]
Signed-off-by: Eric W. Biederman
Cc: Oleg Nesterov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 May, 2007
2 commits
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enhance the initcall_debug boot option:
- measure the time the initcall took to execute and report
it in units of milliseconds.- show the return code of initcalls (useful to see failures and
to make sure that an initcall hung)[akpm@linux-foundation.org: fix printk warning]
Signed-off-by: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add a proper protype for prepare_namespace() in include/linux/init.h.
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
08 May, 2007
1 commit
-
The nr_cpu_ids value is currently only calculated in smp_init. However, it
may be needed before (SLUB needs it on kmem_cache_init!) and other kernel
components may also want to allocate dynamically sized per cpu array before
smp_init. So move the determination of possible cpus into sched_init()
where we already loop over all possible cpus early in boot.Also initialize both nr_node_ids and nr_cpu_ids with the highest value they
could take. If we have accidental users before these values are determined
then the current valud of 0 may cause too small per cpu and per node arrays
to be allocated. If it is set to the maximum possible then we only waste
some memory for early boot users.Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 May, 2007
1 commit
-
* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild: (38 commits)
kconfig: fix mconf segmentation fault
kbuild: enable use of code from a different dir
kconfig: error out if recursive dependencies are found
kbuild: scripts/basic/fixdep segfault on pathological string-o-death
kconfig: correct minor typo in Kconfig warning message.
kconfig: fix path to modules.txt in Kconfig help
usr/Kconfig: fix typo
kernel-doc: alphabetically-sorted entries in index.html of 'htmldocs'
kbuild: be more explicit on missing .config file
kbuild: clarify the creation of the LOCALVERSION_AUTO string.
kbuild: propagate errors from find in scripts/gen_initramfs_list.sh
kconfig: refer to qt3 if we cannot find qt libraries
kbuild: handle compressed cpio initramfs-es
kbuild: ignore section mismatch warning for references from .paravirtprobe to .init.text
kbuild: remove stale comment in modpost.c
kbuild/mkuboot.sh: allow spaces in CROSS_COMPILE
kbuild: fix make mrproper for Documentation/DocBook/man
kbuild: remove kconfig binaries during make mrproper
kconfig/menuconfig: do not hardcode '.config'
kbuild: override build timestamp & version
...
03 May, 2007
2 commits
-
In init/main.c we have a reference from rest_init() to .init.text
which is intentional.
Rename the function 'init' to 'kernel_init' to make it a
kernel wide unique symbol and whitelist the reference.Signed-off-by: Sam Ravnborg
-
Let's allow page-alignment in general for per-cpu data (wanted by Xen, and
Ingo suggested KVM as well).Because larger alignments can use more room, we increase the max per-cpu
memory to 64k rather than 32k: it's getting a little tight.Signed-off-by: Rusty Russell
Signed-off-by: Jeremy Fitzhardinge
Signed-off-by: Andi Kleen
Acked-by: Ingo Molnar
Cc: Andi Kleen
Signed-off-by: Andrew Morton
21 Feb, 2007
1 commit
-
We frequently need the maximum number of possible processors in order to
allocate arrays for all processors. So far this was done using
highest_possible_processor_id(). However, we do need the number of
processors not the highest id. Moreover the number was so far dynamically
calculated on each invokation. The number of possible processors does not
change when the system is running. We can therefore calculate that number
once.Signed-off-by: Christoph Lameter
Cc: Frederik Deweerdt
Cc: Neil Brown
Cc: Trond Myklebust
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
20 Feb, 2007
1 commit
-
powerpc gets:
init/main.c: In function `do_basic_setup':
init/main.c:714: warning: implicit declaration of function `init_irq_proc'but we cannot include linux/irq.h in generic code.
Fix it by moving the declaration into linux/interrupt.h instead.
And make sure all code that defines init_irq_proc() is including
linux/interrupt.h.And nuke an ifdef-in-C
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Feb, 2007
1 commit
-
With Ingo Molnar
The tick-management code is the first user of the clockevents layer. It takes
clock event devices from the clock events core and uses them to provide the
periodic tick.Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar
Cc: john stultz
Cc: Roman Zippel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds