03 Jul, 2010
1 commit
-
…l/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sched: Cure nr_iowait_cpu() users
init: Fix comment
init, sched: Fix race between init and kthreadd
30 Jun, 2010
1 commit
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Apparently "pid-1" confuses people...
Requested-by: Randy Dunlap
Signed-off-by: Peter Zijlstra
Cc: torvalds@linux-foundation.org
Cc: randy.dunlap@oracle.com
Cc: Ilya Loginov
LKML-Reference:
Signed-off-by: Ingo Molnar
29 Jun, 2010
1 commit
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Ilya reported that on a very slow machine he could reliably
reproduce a race between forking init and kthreadd. We first
fork init so that it obtains pid-1, however since the scheduler
is already fully running at this point it can preempt and run
the init thread before we spawn and set kthreadd_task.The init thread can then attempt spawning kthreads without
kthreadd being present which results in an OOPS.Reported-by: Ilya Loginov
Signed-off-by: Peter Zijlstra
Acked-by: Linus Torvalds
LKML-Reference:
Signed-off-by: Ingo Molnar
10 Jun, 2010
1 commit
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Patch is against latest Linus master branch and is expected to be
safe bug fix.You get:
ACPI: HARDWARE addr space,NOT supported yet
for each ACPI defined CPU which status is active, but exceeds
maxcpus= count.As these "not booted" CPUs do not run an idle routine
and echo X >/proc/acpi/processor/*/throttling did not work
I couldn't find a way to really access not onlined/booted
machines. Still this should get fixed and
/proc/acpi/processor/X dirs of cores exceeding maxcpus
should not show up.I wonder whether this could get cleaned up by truncating possible cpu mask
and nr_cpu_ids to setup_max_cpus early some day
(and not exporting setup_max_cpus anymore then).
But this needs touching of a lot other places...Signed-off-by: Thomas Renninger
CC: travis@sgi.com
CC: linux-acpi@vger.kernel.org
CC: lenb@kernel.org
Signed-off-by: Len Brown
25 May, 2010
1 commit
-
For each new populated zone of hotadded node, need to update its pagesets
with dynamically allocated per_cpu_pageset struct for all possible CPUs:1) Detach zone->pageset from the shared boot_pageset
at end of __build_all_zonelists().2) Use mutex to protect zone->pageset when it's still
shared in onlined_pages()Otherwises, multiple zones of different nodes would share same boot strapping
boot_pageset for same CPU, which will finally cause below kernel panic:------------[ cut here ]------------
kernel BUG at mm/page_alloc.c:1239!
invalid opcode: 0000 [#1] SMP
...
Call Trace:
[] __alloc_pages_nodemask+0x131/0x7b0
[] alloc_pages_current+0x87/0xd0
[] __page_cache_alloc+0x67/0x70
[] __do_page_cache_readahead+0x120/0x260
[] ra_submit+0x21/0x30
[] ondemand_readahead+0x166/0x2c0
[] page_cache_async_readahead+0x80/0xa0
[] generic_file_aio_read+0x364/0x670
[] nfs_file_read+0xca/0x130
[] do_sync_read+0xfa/0x140
[] vfs_read+0xb5/0x1a0
[] sys_read+0x51/0x80
[] system_call_fastpath+0x16/0x1b
RIP [] get_page_from_freelist+0x883/0x900
RSP
---[ end trace 4bda28328b9990db ][akpm@linux-foundation.org: merge fix]
Signed-off-by: Haicheng Li
Signed-off-by: Wu Fengguang
Reviewed-by: Andi Kleen
Reviewed-by: Christoph Lameter
Cc: Mel Gorman
Cc: Tejun Heo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
21 May, 2010
2 commits
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The kernel debugger can operate well before mm_init(), but the x86
hardware breakpoint code which uses the perf api requires that the
kernel allocators are initialized.This means the kernel debug core needs to provide an optional arch
specific call back to allow the initialization functions to run after
the kernel has been further initialized.The kdb shell already had a similar restriction with an early
initialization and late initialization. The kdb_init() was moved into
the debug core's version of the late init which is called
dbg_late_init();CC: kgdb-bugreport@lists.sourceforge.net
Signed-off-by: Jason Wessel -
This patch contains the hooks and instrumentation into kernel which
live outside the kernel/debug directory, which the kdb core
will call to run commands like lsmod, dmesg, bt etc...CC: linux-arch@vger.kernel.org
Signed-off-by: Jason Wessel
Signed-off-by: Martin Hicks
30 Mar, 2010
1 commit
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…it slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
25 Mar, 2010
1 commit
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cpuset_mem_spread_node() returns an offline node, and causes an oops.
This patch fixes it by initializing task->mems_allowed to
node_states[N_HIGH_MEMORY], and updating task->mems_allowed when doing
memory hotplug.Signed-off-by: Miao Xie
Acked-by: David Rientjes
Reported-by: Nick Piggin
Tested-by: Nick Piggin
Cc: Paul Menage
Cc: Li Zefan
Cc: Ingo Molnar
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Mar, 2010
3 commits
-
The only in tree external users of the symbol setup_max_cpus are in
arch/x86/. The files ./kernel/alternative.c, ./kernel/visws_quirks.c, and
./mm/kmemcheck/kmemcheck.c are all guarded by CONFIG_SMP being defined.
For this case the symbol is an unsigned int and declared as an extern in
include/linux/smp.h.When CONFIG_SMP is not defined the symbol setup_max_cpus is
a constant value that is only used in init/main.c. Make the symbol
static for this case.Signed-off-by: H Hartley Sweeten
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- new Documentation/init.txt file describing various forms of failure
trying to load the init binary after kernel bootup- extend the init/main.c init failure message to direct to
Documentation/init.txtSigned-off-by: Andreas Mohr
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There are quite a few GFP_KERNEL memory allocations made during
suspend/hibernation and resume that may cause the system to hang, because
the I/O operations they depend on cannot be completed due to the
underlying devices being suspended.Avoid this problem by clearing the __GFP_IO and __GFP_FS bits in
gfp_allowed_mask before suspend/hibernation and restoring the original
values of these bits in gfp_allowed_mask durig the subsequent resume.[akpm@linux-foundation.org: fix CONFIG_PM=n linkage]
Signed-off-by: Rafael J. Wysocki
Reported-by: Maxim Levitsky
Cc: Sebastian Ott
Cc: Benjamin Herrenschmidt
Cc: KOSAKI Motohiro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
05 Mar, 2010
1 commit
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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (52 commits)
init: Open /dev/console from rootfs
mqueue: fix typo "failues" -> "failures"
mqueue: only set error codes if they are really necessary
mqueue: simplify do_open() error handling
mqueue: apply mathematics distributivity on mq_bytes calculation
mqueue: remove unneeded info->messages initialization
mqueue: fix mq_open() file descriptor leak on user-space processes
fix race in d_splice_alias()
set S_DEAD on unlink() and non-directory rename() victims
vfs: add NOFOLLOW flag to umount(2)
get rid of ->mnt_parent in tomoyo/realpath
hppfs can use existing proc_mnt, no need for do_kern_mount() in there
Mirror MS_KERNMOUNT in ->mnt_flags
get rid of useless vfsmount_lock use in put_mnt_ns()
Take vfsmount_lock to fs/internal.h
get rid of insanity with namespace roots in tomoyo
take check for new events in namespace (guts of mounts_poll()) to namespace.c
Don't mess with generic_permission() under ->d_lock in hpfs
sanitize const/signedness for udf
nilfs: sanitize const/signedness in dealing with ->d_name.name
...Fix up fairly trivial (famous last words...) conflicts in
drivers/infiniband/core/uverbs_main.c and security/tomoyo/realpath.c
04 Mar, 2010
2 commits
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To avoid potential problems with an empty /dev open /dev/console
from rootfs instead of waiting to mount our root filesystem and
mounting it there. This effectively guarantees that there will
be a device node, and it won't be on a filesystem that we will
ever unmount, so there are no issues with leaving /dev/console
open and pinning the filesystem.This is actually more effective than automatically mounting
devtmpfs on /dev because it removes removes the occasionally
problematic assumption that /dev/console exists from the boot
code.With this patch I was able to throw busybox on my /boot partition
(which has no /dev directory) and boot into userspace without
problems.The only possible negative consequence I can think of is that
someone out there deliberately used did not use a character device
that is major 5 minor 2 for /dev/console. Does anyone know of a
situation in which that could make sense?Signed-off-by: Eric W. Biederman
Signed-off-by: Al Viro -
* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (25 commits)
x86: Fix out of order of gsi
x86: apic: Fix mismerge, add arch_probe_nr_irqs() again
x86, irq: Keep chip_data in create_irq_nr and destroy_irq
xen: Remove unnecessary arch specific xen irq functions.
smp: Use nr_cpus= to set nr_cpu_ids early
x86, irq: Remove arch_probe_nr_irqs
sparseirq: Use radix_tree instead of ptrs array
sparseirq: Change irq_desc_ptrs to static
init: Move radix_tree_init() early
irq: Remove unnecessary bootmem code
x86: Add iMac9,1 to pci_reboot_dmi_table
x86: Convert i8259_lock to raw_spinlock
x86: Convert nmi_lock to raw_spinlock
x86: Convert ioapic_lock and vector_lock to raw_spinlock
x86: Avoid race condition in pci_enable_msix()
x86: Fix SCI on IOAPIC != 0
x86, ia32_aout: do not kill argument mapping
x86, irq: Move __setup_vector_irq() before the first irq enable in cpu online path
x86, irq: Update the vector domain for legacy irqs handled by io-apic
x86, irq: Don't block IRQ0_VECTOR..IRQ15_VECTOR's on all cpu's
...
25 Feb, 2010
1 commit
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Update the rcu_dereference() usages to take advantage of the new
lockdep-based checking.Signed-off-by: Paul E. McKenney
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference:
[ -v2: fix allmodconfig missing symbol export build failure on x86 ]
Signed-off-by: Ingo Molnar
18 Feb, 2010
2 commits
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On x86, before prefill_possible_map(), nr_cpu_ids will be NR_CPUS aka
CONFIG_NR_CPUS.Add nr_cpus= to set nr_cpu_ids. so we can simulate cpus
LKML-Reference:
Acked-by: Linus Torvalds
Signed-off-by: H. Peter Anvin
Cc: Tony Luck -
Prepare for using radix trees in early_irq_init().
Signed-off-by: Yinghai Lu
LKML-Reference:
Signed-off-by: H. Peter Anvin
07 Feb, 2010
1 commit
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ima wants to create an inode information struct (iint) when inodes are
allocated. This means that at least the part of ima which does this
allocation (the allocation is filled with information later) should
before any inodes are created. To accomplish this we split the ima
initialization routine placing the kmem cache allocator inside a
security_initcall() function. Since this makes use of radix trees we also
need to make sure that is initialized before security_initcall().Signed-off-by: Eric Paris
Acked-by: Mimi Zohar
Signed-off-by: Al Viro
17 Dec, 2009
1 commit
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A UP machine has 1 active cpu, not having the boot-cpu in the
active map when starting the scheduler confuses things.Signed-off-by: Peter Zijlstra
Cc: Mike Galbraith
LKML-Reference:
Signed-off-by: Ingo Molnar
16 Dec, 2009
1 commit
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The symbol 'call' is a static symbol used for initcall_debug. This same
symbol name is used locally by a couple functions and produces the
following sparse warnings:warning: symbol 'call' shadows an earlier one
Fix this noise by renaming the local symbols.
Signed-off-by: H Hartley Sweeten
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
03 Dec, 2009
1 commit
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Jon confirms that recent modprobe will look in /proc/cmdline, so these
cmdline options can still be used.See http://bugzilla.kernel.org/show_bug.cgi?id=14164
Reported-by: Adam Williamson
Cc: stable@kernel.org
Signed-off-by: Rusty Russell
Signed-off-by: Linus Torvalds
09 Oct, 2009
1 commit
-
…/git/tip/linux-2.6-tip
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
futex: fix requeue_pi key imbalance
futex: Fix typo in FUTEX_WAIT/WAKE_BITSET_PRIVATE definitions
rcu: Place root rcu_node structure in separate lockdep class
rcu: Make hot-unplugged CPU relinquish its own RCU callbacks
rcu: Move rcu_barrier() to rcutree
futex: Move exit_pi_state() call to release_mm()
futex: Nullify robust lists after cleanup
futex: Fix locking imbalance
panic: Fix panic message visibility by calling bust_spinlocks(0) before dying
rcu: Replace the rcu_barrier enum with pointer to call_rcu*() function
rcu: Clean up code based on review feedback from Josh Triplett, part 4
rcu: Clean up code based on review feedback from Josh Triplett, part 3
rcu: Fix rcu_lock_map build failure on CONFIG_PROVE_LOCKING=y
rcu: Clean up code to address Ingo's checkpatch feedback
rcu: Clean up code based on review feedback from Josh Triplett, part 2
rcu: Clean up code based on review feedback from Josh Triplett
24 Sep, 2009
5 commits
-
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: (39 commits)
cpumask: Move deprecated functions to end of header.
cpumask: remove unused deprecated functions, avoid accusations of insanity
cpumask: use new-style cpumask ops in mm/quicklist.
cpumask: use mm_cpumask() wrapper: x86
cpumask: use mm_cpumask() wrapper: um
cpumask: use mm_cpumask() wrapper: mips
cpumask: use mm_cpumask() wrapper: mn10300
cpumask: use mm_cpumask() wrapper: m32r
cpumask: use mm_cpumask() wrapper: arm
cpumask: Use accessors for cpu_*_mask: um
cpumask: Use accessors for cpu_*_mask: powerpc
cpumask: Use accessors for cpu_*_mask: mips
cpumask: Use accessors for cpu_*_mask: m32r
cpumask: remove arch_send_call_function_ipi
cpumask: arch_send_call_function_ipi_mask: s390
cpumask: arch_send_call_function_ipi_mask: powerpc
cpumask: arch_send_call_function_ipi_mask: mips
cpumask: arch_send_call_function_ipi_mask: m32r
cpumask: arch_send_call_function_ipi_mask: alpha
cpumask: remove obsolete topology_core_siblings and topology_thread_siblings: ia64
... -
* remove asm/atomic.h inclusion from linux/utsname.h --
not needed after kref conversion
* remove linux/utsname.h inclusion from files which do not need itNOTE: it looks like fs/binfmt_elf.c do not need utsname.h, however
due to some personality stuff it _is_ needed -- cowardly leave ELF-related
headers and files alone.Signed-off-by: Alexey Dobriyan
Signed-off-by: Linus Torvalds -
It's only defined for NR_CPUS > BITS_PER_LONG; cpu_all_mask is always
defined (and const).Signed-off-by: Rusty Russell
-
These issues identified during an old-fashioned face-to-face code
review extending over many hours.o Add comments for tricky parts of code, and correct comments
that have passed their sell-by date.o Get rid of the vestiges of rcu_init_sched(), which is no
longer needed now that PREEMPT_RCU is gone.o Move the #include of rcutree_plugin.h to the end of
rcutree.c, which means that, rather than having a random
collection of forward declarations, the new set of forward
declarations document the set of plugins. The new home for
this #include also allows __rcu_init_preempt() to move into
rcutree_plugin.h.o Fix rcu_preempt_check_callbacks() to be static.
Suggested-by: Josh Triplett
Signed-off-by: Paul E. McKenney
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference:
Signed-off-by: Ingo Molnar
Peter Zijlstra -
* 'sfi-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-sfi-2.6:
SFI: remove unneeded includes
sfi: Remove unused code
SFI: Hook PCI MMCONFIG
x86: add arch-specific SFI support
SFI: add capability to parse ACPI tables
SFI: add platform-independent core support
SFI: create linux/sfi.h
SFI: Simple Firmware Interface - MAINTAINERS, Kconfig
22 Sep, 2009
1 commit
-
Sizing of memory allocations shouldn't depend on the number of physical
pages found in a system, as that generally includes (perhaps a huge amount
of) non-RAM pages. The amount of what actually is usable as storage
should instead be used as a basis here.Some of the calculations (i.e. those not intending to use high memory)
should likely even use (totalram_pages - totalhigh_pages).Signed-off-by: Jan Beulich
Acked-by: Rusty Russell
Acked-by: Ingo Molnar
Cc: Dave Airlie
Cc: Kyle McMartin
Cc: Jeremy Fitzhardinge
Cc: Pekka Enberg
Cc: Hugh Dickins
Cc: "David S. Miller"
Cc: Patrick McHardy
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
19 Sep, 2009
1 commit
-
Conflicts:
arch/x86/kernel/setup.c
drivers/acpi/power.c
init/main.cSigned-off-by: Len Brown
16 Sep, 2009
3 commits
-
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev
debugfs: Modify default debugfs directory for debugging pktcdvd.
debugfs: Modified default dir of debugfs for debugging UHCI.
debugfs: Change debugfs directory of IWMC3200
debugfs: Change debuhgfs directory of trace-events-sample.h
debugfs: Fix mount directory of debugfs by default in events.txt
hpilo: add poll f_op
hpilo: add interrupt handler
hpilo: staging for interrupt handling
driver core: platform_device_add_data(): use kmemdup()
Driver core: Add support for compatibility classes
uio: add generic driver for PCI 2.3 devices
driver-core: move dma-coherent.c from kernel to driver/base
mem_class: fix bug
mem_class: use minor as index instead of searching the array
driver model: constify attribute groups
UIO: remove 'default n' from Kconfig
Driver core: Add accessor for device platform data
Driver core: move dev_get/set_drvdata to drivers/base/dd.c
Driver core: add new device to bus's list before probing -
Devtmpfs lets the kernel create a tmpfs instance called devtmpfs
very early at kernel initialization, before any driver-core device
is registered. Every device with a major/minor will provide a
device node in devtmpfs.Devtmpfs can be changed and altered by userspace at any time,
and in any way needed - just like today's udev-mounted tmpfs.
Unmodified udev versions will run just fine on top of it, and will
recognize an already existing kernel-created device node and use it.
The default node permissions are root:root 0600. Proper permissions
and user/group ownership, meaningful symlinks, all other policy still
needs to be applied by userspace.If a node is created by devtmps, devtmpfs will remove the device node
when the device goes away. If the device node was created by
userspace, or the devtmpfs created node was replaced by userspace, it
will no longer be removed by devtmpfs.If it is requested to auto-mount it, it makes init=/bin/sh work
without any further userspace support. /dev will be fully populated
and dynamic, and always reflect the current device state of the kernel.
With the commonly used dynamic device numbers, it solves the problem
where static devices nodes may point to the wrong devices.It is intended to make the initial bootup logic simpler and more robust,
by de-coupling the creation of the inital environment, to reliably run
userspace processes, from a complex userspace bootstrap logic to provide
a working /dev.Signed-off-by: Kay Sievers
Signed-off-by: Jan Blunck
Tested-By: Harald Hoyer
Tested-By: Scott James Remnant
Signed-off-by: Greg Kroah-Hartman -
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (46 commits)
powerpc64: convert to dynamic percpu allocator
sparc64: use embedding percpu first chunk allocator
percpu: kill lpage first chunk allocator
x86,percpu: use embedding for 64bit NUMA and page for 32bit NUMA
percpu: update embedding first chunk allocator to handle sparse units
percpu: use group information to allocate vmap areas sparsely
vmalloc: implement pcpu_get_vm_areas()
vmalloc: separate out insert_vmalloc_vm()
percpu: add chunk->base_addr
percpu: add pcpu_unit_offsets[]
percpu: introduce pcpu_alloc_info and pcpu_group_info
percpu: move pcpu_lpage_build_unit_map() and pcpul_lpage_dump_cfg() upward
percpu: add @align to pcpu_fc_alloc_fn_t
percpu: make @dyn_size mandatory for pcpu_setup_first_chunk()
percpu: drop @static_size from first chunk allocators
percpu: generalize first chunk allocator selection
percpu: build first chunk allocators selectively
percpu: rename 4k first chunk allocator to page
percpu: improve boot messages
percpu: fix pcpu_reclaim() locking
...Fix trivial conflict as by Tejun Heo in kernel/sched.c
12 Sep, 2009
1 commit
-
…/git/tip/linux-2.6-tip
* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (64 commits)
sched: Fix sched::sched_stat_wait tracepoint field
sched: Disable NEW_FAIR_SLEEPERS for now
sched: Keep kthreads at default priority
sched: Re-tune the scheduler latency defaults to decrease worst-case latencies
sched: Turn off child_runs_first
sched: Ensure that a child can't gain time over it's parent after fork()
sched: enable SD_WAKE_IDLE
sched: Deal with low-load in wake_affine()
sched: Remove short cut from select_task_rq_fair()
sched: Turn on SD_BALANCE_NEWIDLE
sched: Clean up topology.h
sched: Fix dynamic power-balancing crash
sched: Remove reciprocal for cpu_power
sched: Try to deal with low capacity, fix update_sd_power_savings_stats()
sched: Try to deal with low capacity
sched: Scale down cpu_power due to RT tasks
sched: Implement dynamic cpu_power
sched: Add smt_gain
sched: Update the cpu_power sum during load-balance
sched: Add SD_PREFER_SIBLING
...
04 Sep, 2009
1 commit
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Ingo was getting warnings from rcu_scheduler_starting()
indicating that context switches had occurred before RCU ended
its special early-boot handling of grace periods.This is a dangerous condition, as it indicates that RCU might
have prematurely ended grace periods. This exploratory fix
moves rcu_scheduler_starting() earlier in boot.Reported-by: Ingo Molnar
Signed-off-by: Paul E. McKenney
Signed-off-by: Ingo Molnar
29 Aug, 2009
1 commit
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drivers/sfi/sfi_core.c contains the generic SFI implementation.
It has a private header, sfi_core.h, for its own use and the
private use of future files in drivers/sfi/Signed-off-by: Feng Tang
Signed-off-by: Len Brown
27 Aug, 2009
1 commit
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Some architectures initialize clocks and timers in late_time_init and
x86 wants to do the same to avoid FIXMAP hackery for calibrating the
TSC. That would result in undefined sched_clock readout and wreckaged
printk timestamps again. We probably have those already on archs which
do all their time/clock setup in late_time_init.There is no harm to move that after late_time_init except that a few
more boot timestamps are stale. The scheduler is not active at that
point so no real wreckage is expected.Signed-off-by: Thomas Gleixner
LKML-Reference:
Cc: linux-arch@vger.kernel.org
26 Aug, 2009
1 commit
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…nel/git/tip/linux-2.6-tip
* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
tracing: Fix too large stack usage in do_one_initcall()
tracing: handle broken names in ftrace filter
ftrace: Unify effect of writing to trace_options and option/*
21 Aug, 2009
1 commit
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One of my testboxes triggered this nasty stack overflow crash
during SCSI probing:[ 5.874004] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 5.875004] device: 'sda': device_add
[ 5.878004] BUG: unable to handle kernel NULL pointer dereference at 00000a0c
[ 5.878004] IP: [] print_context_stack+0x81/0x110
[ 5.878004] *pde = 00000000
[ 5.878004] Thread overran stack, or stack corrupted
[ 5.878004] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 5.878004] last sysfs file:
[ 5.878004]
[ 5.878004] Pid: 1, comm: swapper Not tainted (2.6.31-rc6-tip-01272-g9919e28-dirty #5685)
[ 5.878004] EIP: 0060:[] EFLAGS: 00010083 CPU: 0
[ 5.878004] EIP is at print_context_stack+0x81/0x110
[ 5.878004] EAX: cf8a3000 EBX: cf8a3fe4 ECX: 00000049 EDX: 00000000
[ 5.878004] ESI: b1cfce84 EDI: 00000000 EBP: cf8a3018 ESP: cf8a2ff4
[ 5.878004] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 5.878004] Process swapper (pid: 1, ti=cf8a2000 task=cf8a8000 task.ti=cf8a3000)
[ 5.878004] Stack:
[ 5.878004] b1004867 fffff000 cf8a3ffc
[ 5.878004] Call Trace:
[ 5.878004] [] ? kernel_thread_helper+0x7/0x10
[ 5.878004] BUG: unable to handle kernel NULL pointer dereference at 00000a0c
[ 5.878004] IP: [] print_context_stack+0x81/0x110
[ 5.878004] *pde = 00000000
[ 5.878004] Thread overran stack, or stack corrupted
[ 5.878004] Oops: 0000 [#2] PREEMPT SMP DEBUG_PAGEALLOCThe oops did not reveal any more details about the real stack
that we have and the system got into an infinite loop of
recursive pagefaults.So i booted with CONFIG_STACK_TRACER=y and the 'stacktrace' boot
parameter. The box did not crash (timings/conditions probably
changed a tiny bit to trigger the catastrophic crash), but the
/debug/tracing/stack_trace file was rather revealing:Depth Size Location (72 entries)
----- ---- --------
0) 3704 52 __change_page_attr+0xb8/0x290
1) 3652 24 __change_page_attr_set_clr+0x43/0x90
2) 3628 60 kernel_map_pages+0x108/0x120
3) 3568 40 prep_new_page+0x7d/0x130
4) 3528 84 get_page_from_freelist+0x106/0x420
5) 3444 116 __alloc_pages_nodemask+0xd7/0x550
6) 3328 36 allocate_slab+0xb1/0x100
7) 3292 36 new_slab+0x1c/0x160
8) 3256 36 __slab_alloc+0x133/0x2b0
9) 3220 4 kmem_cache_alloc+0x1bb/0x1d0
10) 3216 108 create_object+0x28/0x250
11) 3108 40 kmemleak_alloc+0x81/0xc0
12) 3068 24 kmem_cache_alloc+0x162/0x1d0
13) 3044 52 scsi_pool_alloc_command+0x29/0x70
14) 2992 20 scsi_host_alloc_command+0x22/0x70
15) 2972 24 __scsi_get_command+0x1b/0x90
16) 2948 28 scsi_get_command+0x35/0x90
17) 2920 24 scsi_setup_blk_pc_cmnd+0xd4/0x100
18) 2896 128 sd_prep_fn+0x332/0xa70
19) 2768 36 blk_peek_request+0xe7/0x1d0
20) 2732 56 scsi_request_fn+0x54/0x520
21) 2676 12 __generic_unplug_device+0x2b/0x40
22) 2664 24 blk_execute_rq_nowait+0x59/0x80
23) 2640 172 blk_execute_rq+0x6b/0xb0
24) 2468 32 scsi_execute+0xe0/0x140
25) 2436 64 scsi_execute_req+0x152/0x160
26) 2372 60 scsi_vpd_inquiry+0x6c/0x90
27) 2312 44 scsi_get_vpd_page+0x112/0x160
28) 2268 52 sd_revalidate_disk+0x1df/0x320
29) 2216 92 rescan_partitions+0x98/0x330
30) 2124 52 __blkdev_get+0x309/0x350
31) 2072 8 blkdev_get+0xf/0x20
32) 2064 44 register_disk+0xff/0x120
33) 2020 36 add_disk+0x6e/0xb0
34) 1984 44 sd_probe_async+0xfb/0x1d0
35) 1940 44 __async_schedule+0xf4/0x1b0
36) 1896 8 async_schedule+0x12/0x20
37) 1888 60 sd_probe+0x305/0x360
38) 1828 44 really_probe+0x63/0x170
39) 1784 36 driver_probe_device+0x5d/0x60
40) 1748 16 __device_attach+0x49/0x50
41) 1732 32 bus_for_each_drv+0x5b/0x80
42) 1700 24 device_attach+0x6b/0x70
43) 1676 16 bus_attach_device+0x47/0x60
44) 1660 76 device_add+0x33d/0x400
45) 1584 52 scsi_sysfs_add_sdev+0x6a/0x2c0
46) 1532 108 scsi_add_lun+0x44b/0x460
47) 1424 116 scsi_probe_and_add_lun+0x182/0x4e0
48) 1308 36 __scsi_add_device+0xd9/0xe0
49) 1272 44 ata_scsi_scan_host+0x10b/0x190
50) 1228 24 async_port_probe+0x96/0xd0
51) 1204 44 __async_schedule+0xf4/0x1b0
52) 1160 8 async_schedule+0x12/0x20
53) 1152 48 ata_host_register+0x171/0x1d0
54) 1104 60 ata_pci_sff_activate_host+0xf3/0x230
55) 1044 44 ata_pci_sff_init_one+0xea/0x100
56) 1000 48 amd_init_one+0xb2/0x190
57) 952 8 local_pci_probe+0x13/0x20
58) 944 32 pci_device_probe+0x68/0x90
59) 912 44 really_probe+0x63/0x170
60) 868 36 driver_probe_device+0x5d/0x60
61) 832 20 __driver_attach+0x89/0xa0
62) 812 32 bus_for_each_dev+0x5b/0x80
63) 780 12 driver_attach+0x1e/0x20
64) 768 72 bus_add_driver+0x14b/0x2d0
65) 696 36 driver_register+0x6e/0x150
66) 660 20 __pci_register_driver+0x53/0xc0
67) 640 8 amd_init+0x14/0x16
68) 632 572 do_one_initcall+0x2b/0x1d0
69) 60 12 do_basic_setup+0x56/0x6a
70) 48 20 kernel_init+0x84/0xce
71) 28 28 kernel_thread_helper+0x7/0x10There's a lot of fat functions on that stack trace, but
the largest of all is do_one_initcall(). This is due to
the boot trace entry variables being on the stack.Fixing this is relatively easy, initcalls are fundamentally
serialized, so we can move the local variables to file scope.Note that this large stack footprint was present for a
couple of months already - what pushed my system over
the edge was the addition of kmemleak to the call-chain:6) 3328 36 allocate_slab+0xb1/0x100
7) 3292 36 new_slab+0x1c/0x160
8) 3256 36 __slab_alloc+0x133/0x2b0
9) 3220 4 kmem_cache_alloc+0x1bb/0x1d0
10) 3216 108 create_object+0x28/0x250
11) 3108 40 kmemleak_alloc+0x81/0xc0
12) 3068 24 kmem_cache_alloc+0x162/0x1d0
13) 3044 52 scsi_pool_alloc_command+0x29/0x70This pushes the total to ~3800 bytes, only a tiny bit
more was needed to corrupt the on-kernel-stack thread_info.The fix reduces the stack footprint from 572 bytes
to 28 bytes.Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: Frederic Weisbecker
Cc: Steven Rostedt
Cc: Catalin Marinas
Cc: Jens Axboe
Cc: Linus Torvalds
Cc:
LKML-Reference:
Signed-off-by: Ingo Molnar
14 Aug, 2009
1 commit
-
Conflicts:
arch/sparc/kernel/smp_64.c
arch/x86/kernel/cpu/perf_counter.c
arch/x86/kernel/setup_percpu.c
drivers/cpufreq/cpufreq_ondemand.c
mm/percpu.cConflicts in core and arch percpu codes are mostly from commit
ed78e1e078dd44249f88b1dd8c76dafb39567161 which substituted many
num_possible_cpus() with nr_cpu_ids. As for-next branch has moved all
the first chunk allocators into mm/percpu.c, the changes are moved
from arch code to mm/percpu.c.Signed-off-by: Tejun Heo