Peter Zijlstra 1e40c2edef mutex: Fix/document access-once assumption in mutex_can_spin_on_owner() ...

mutex_can_spin_on_owner() is technically broken in that it would
in theory allow the compiler to load lock->owner twice, seeing a
pointer first time and a NULL pointer the second time.

Linus pointed out that a compiler has to be seriously broken to
not compile this correctly - but nevertheless this change
is correct as it will better document the implementation.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Acked-by: Waiman Long <Waiman.Long@hp.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Link: http://lkml.kernel.org/r/20130719183101.GA20909@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2013-07-22 10:33:39 +02:00

..

cpu

idle: Enable interrupts in the weak arch_cpu_idle() implementation

2013-06-14 23:01:05 +02:00

debug

kgdb/sysrq: fix inconstistent help message of sysrq key

2013-04-30 17:04:10 -07:00

events

perf: Drop sample rate when sampling is too slow

2013-06-23 11:52:57 +02:00

gcov

kernel/gcov: remove depends on CONFIG_EXPERIMENTAL

2013-01-11 11:39:33 -08:00

irq

irqdomain refactoring for v3.11

2013-07-06 12:37:04 -07:00

power

Merge branch 'akpm' (updates from Andrew Morton)

2013-07-03 17:12:13 -07:00

sched

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-07-06 14:09:38 -07:00

time

clocksource: Reselect clocksource when watchdog validated high-res capability

2013-07-05 11:09:28 +02:00

trace

tracing: Fix outputting formats of x86-tsc and counter when use trace_clock

2013-06-11 13:58:46 -04:00

.gitignore

kernel/hz.bc: ignore.

2013-04-22 07:09:06 -07:00

acct.c

fs: Fix hang with BSD accounting on frozen filesystem

2013-05-04 14:57:58 -04:00

async.c

async: rename and redefine async_func_ptr

2013-03-12 13:59:14 -07:00

audit_tree.c

kernel/audit_tree.c:audit_add_tree_rule(): protect `rule' from kill_rules()

2013-06-12 16:29:46 -07:00

audit_watch.c

audit: catch possible NULL audit buffers

2013-01-11 14:54:55 -08:00

audit.c

audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE

2013-06-12 16:29:45 -07:00

audit.h

audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record

2013-07-09 10:33:19 -07:00

auditfilter.c

audit: Fix decimal constant description

2013-07-09 10:33:19 -07:00

auditsc.c

audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record

2013-07-09 10:33:19 -07:00

backtracetest.c

…

bounds.c

…

capability.c

Add file_ns_capable() helper function for open-time capability checking

2013-04-14 10:06:31 -07:00

cgroup_freezer.c

cgroup: rename ->create/post_create/pre_destroy/destroy() to ->css_alloc/online/offline/free()

2012-11-19 08:13:38 -08:00

cgroup.c

cgroup: CGRP_ROOT_SUBSYS_BOUND should also be ignored when mounting an existing hierarchy

2013-06-29 14:06:10 -07:00

compat.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-05-01 07:21:43 -07:00

configs.c

proc: Supply PDE attribute setting accessor functions

2013-05-01 17:29:18 -04:00

context_tracking.c

Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-06-20 08:18:35 -10:00

cpu_pm.c

…

cpu.c

CPU hotplug: provide a generic helper to disable/enable CPU hotplug

2013-06-12 16:29:44 -07:00

cpuset.c

Merge branch 'for-3.11-cpuset' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2013-07-02 20:04:25 -07:00

crash_dump.c

…

cred.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2012-12-18 10:55:28 -08:00

delayacct.c

cputime: Use accessors to read task cputime stats

2013-01-27 19:23:31 +01:00

dma.c

…

elfcore.c

…

exec_domain.c

…

exit.c

ptrace: revert "Prepare to fix racy accesses on task breakpoints"

2013-07-09 10:33:26 -07:00

extable.c

extable: Flip the sorting message

2013-04-15 13:25:16 +02:00

fork.c

kernel/fork.c:copy_process(): consolidate the lockless CLONE_THREAD checks

2013-07-03 16:08:03 -07:00

freezer.c

freezer: skip waking up tasks with PF_FREEZER_SKIP set

2013-05-12 14:16:22 +02:00

futex_compat.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

futex.c

futex: Use freezable blocking call

2013-06-25 23:11:19 +02:00

groups.c

…

hrtimer.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-07-06 14:09:38 -07:00

hung_task.c

…

irq_work.c

Merge branch 'nohz/printk-v8' into irq/core

2013-02-05 00:48:46 +01:00

itimer.c

…

jump_label.c

jump_label: Export jump_label_rate_limit()

2012-08-06 19:00:35 +03:00

kallsyms.c

kernel: kallsyms: memory override issue, need check destination buffer length

2013-04-15 15:17:26 +09:30

kcmp.c

kcmp: include linux/ptrace.h

2012-12-20 17:40:19 -08:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

locking: Fix copy/paste errors of "ARCH_INLINE_*_UNLOCK_BH"

2013-05-28 08:50:00 +02:00

Kconfig.preempt

…

kexec.c

kexec: Use min() and min_t() to simplify logic

2013-04-30 17:04:07 -07:00

kmod.c

usermodehelper: kill the sub_info->path[0] check

2013-07-03 16:08:02 -07:00

kprobes.c

kprobes: handle empty/invalid input to debugfs "enabled" file

2013-07-03 16:07:46 -07:00

ksysfs.c

Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-12-11 18:10:49 -08:00

kthread.c

kthread: implement probe_kthread_data()

2013-04-30 17:04:02 -07:00

latencytop.c

…

lglock.c

lglock: Update lockdep annotations to report recursive local locks

2013-07-12 13:51:19 +02:00

lockdep_internals.h

…

lockdep_proc.c

lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()

2012-10-24 12:39:09 +02:00

lockdep_states.h

…

lockdep.c

lockdep: remove task argument from debug_check_no_locks_held

2013-05-12 14:16:21 +02:00

Makefile

reboot: move shutdown/reboot related functions to kernel/reboot.c

2013-07-09 10:33:29 -07:00

modsign_certificate.S

CONFIG_SYMBOL_PREFIX: cleanup.

2013-03-15 15:09:43 +10:30

modsign_pubkey.c

keys: use keyring_alloc() to create module signing keyring

2012-12-20 17:40:21 -08:00

module_signing.c

MODSIGN: Don't use enum-type bitfields in module signature info block

2012-12-05 11:27:24 +10:30

module-internal.h

MODSIGN: Move the magic string to the end of a module and eliminate the search

2012-10-19 17:30:40 -07:00

module.c

kmemleak: No need for scanning specific module sections

2013-05-17 09:53:36 +01:00

mutex-debug.c

…

mutex-debug.h

…

mutex.c

mutex: Fix/document access-once assumption in mutex_can_spin_on_owner()

2013-07-22 10:33:39 +02:00

mutex.h

…

notifier.c

…

nsproxy.c

proc: Split the namespace stuff out into linux/proc_ns.h

2013-05-01 17:29:39 -04:00

padata.c

padata: use __this_cpu_read per-cpu helper

2012-12-06 17:16:23 +08:00

panic.c

panic: add cpu/pid to warn_slowpath_common in WARNING printk()s

2013-07-09 10:33:25 -07:00

params.c

params: Fix potential memory leak in add_sysfs_param()

2013-03-18 11:40:21 +00:00

pid_namespace.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-05-01 17:51:54 -07:00

pid.c

kernel/pid.c: move statement

2013-07-03 16:08:05 -07:00

posix-cpu-timers.c

posix_timers: fix racy timer delta caching on task exit

2013-07-03 16:54:42 +02:00

posix-timers.c

posix-timers: Remove unused variable

2013-04-18 12:51:19 +02:00

printk.c

kmsg: honor dmesg_restrict sysctl on /dev/kmsg

2013-06-12 16:29:44 -07:00

profile.c

proc: Supply PDE attribute setting accessor functions

2013-05-01 17:29:18 -04:00

ptrace.c

ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)

2013-07-09 10:33:26 -07:00

range.c

range: Do not add new blank slot with add_range_with_merge

2013-06-18 11:32:10 -05:00

rcu.h

rcu: Provide RCU CPU stall warnings for tiny RCU

2013-01-28 22:06:21 -08:00

rcupdate.c

Merge branches 'cbnum.2013.06.10a', 'doc.2013.06.10a', 'fixes.2013.06.10a', 'srcu.2013.06.10a' and 'tiny.2013.06.10a' into HEAD

2013-06-10 13:46:44 -07:00

rcutiny_plugin.h

rcu: Shrink TINY_RCU by reworking CPU-stall ifdefs

2013-06-10 13:45:53 -07:00

rcutiny.c

rcu: Shrink TINY_RCU by reworking CPU-stall ifdefs

2013-06-10 13:45:53 -07:00

rcutorture.c

rcu: Remove srcu_read_lock_raw() and srcu_read_unlock_raw().

2013-06-10 13:45:25 -07:00

rcutree_plugin.h

Merge branches 'cbnum.2013.06.10a', 'doc.2013.06.10a', 'fixes.2013.06.10a', 'srcu.2013.06.10a' and 'tiny.2013.06.10a' into HEAD

2013-06-10 13:46:44 -07:00

rcutree_trace.c

rcutrace: single_open() leaks

2013-05-05 00:16:35 -04:00

rcutree.c

drivers: avoid parsing names as kthread_run() format strings

2013-07-03 16:07:41 -07:00

rcutree.h

rcu: Drive quiescent-state-forcing delay from HZ

2013-06-10 13:44:56 -07:00

reboot.c

reboot: move arch/x86 reboot= handling to generic kernel

2013-07-09 10:33:29 -07:00

relay.c

Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block

2013-05-08 10:13:35 -07:00

res_counter.c

res_counter: return amount of charges after res_counter_uncharge()

2012-12-18 15:02:12 -08:00

resource.c

kernel/resource.c: remove the unneeded assignment in function __find_resource

2013-07-03 16:08:06 -07:00

rtmutex_common.h

…

rtmutex-debug.c

sched/rt: Move rt specific bits into new header file

2013-02-07 20:51:08 +01:00

rtmutex-debug.h

…

rtmutex-tester.c

locking/rtmutex/tester: Set correct permissions on sysfs files

2013-04-10 14:48:37 +02:00

rtmutex.c

rtmutex: Document rt_mutex_adjust_prio_chain()

2013-05-28 09:23:52 +02:00

rtmutex.h

…

rwsem.c

Revert "rw_semaphore: remove up/down_read_non_owner"

2013-03-23 15:53:52 -07:00

seccomp.c

seccomp: allow BPF_XOR based ALU instructions.

2013-03-26 11:07:19 +11:00

semaphore.c

semaphore: use `bool' type for semaphore_waiter's up

2013-04-30 17:04:08 -07:00

signal.c

sigtimedwait: use freezable blocking call

2013-05-12 14:16:23 +02:00

smp.c

kernel/smp.c: cleanups

2013-04-30 17:04:03 -07:00

smpboot.c

kthread: Prevent unpark race which puts threads on the wrong cpu

2013-04-12 14:18:43 +02:00

smpboot.h

smpboot: Provide infrastructure for percpu hotplug threads

2012-08-13 17:01:07 +02:00

softirq.c

Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-07-02 16:14:35 -07:00

spinlock.c

…

srcu.c

srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()

2013-02-07 15:19:36 -08:00

stacktrace.c

…

stop_machine.c

stop_machine: Mark per cpu stopper enabled early

2013-02-26 22:25:17 +01:00

sys_ni.c

unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE

2013-05-09 13:46:38 -04:00

sys.c

reboot: move shutdown/reboot related functions to kernel/reboot.c

2013-07-09 10:33:29 -07:00

sysctl_binary.c

switch compat_sys_sysctl to COMPAT_SYSCALL_DEFINE

2013-05-09 14:53:20 -04:00

sysctl.c

perf: Drop sample rate when sampling is too slow

2013-06-23 11:52:57 +02:00

task_work.c

task_work: task_work_add() should not succeed after exit_task_work()

2012-09-13 16:47:34 +02:00

taskstats.c

taskstats: cgroupstats_user_cmd() may leak on error

2012-10-06 03:05:31 +09:00

test_kprobes.c

kernel/: rename random32() to prandom_u32()

2013-04-29 18:28:42 -07:00

time.c

sched: Rename sched.c as sched/core.c in comments and Documentation

2013-06-19 12:58:42 +02:00

timeconst.bc

kernel: Replace timeconst.pl with a bc script

2013-02-16 23:17:25 +01:00

timer.c

timer: Fix jiffies wrap behavior of round_jiffies_common()

2013-06-28 17:10:11 +02:00

tracepoint.c

Tracing updates for Linux 3.10

2013-04-29 13:55:38 -07:00

tsacct.c

cputime: Use accessors to read task cputime stats

2013-01-27 19:23:31 +01:00

uid16.c

make SYSCALL_DEFINE<n>-generated wrappers do asmlinkage_protect

2013-03-03 22:58:33 -05:00

up.c

…

user_namespace.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-05-01 17:51:54 -07:00

user-return-notifier.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

user.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-05-01 17:51:54 -07:00

utsname_sysctl.c

kernel/utsname_sysctl.c: put get/get_uts() into CONFIG_PROC_SYSCTL code block

2013-02-27 19:10:22 -08:00

utsname.c

proc: Split the namespace stuff out into linux/proc_ns.h

2013-05-01 17:29:39 -04:00

wait.c

Add wait_on_atomic_t() and wake_up_atomic_t()

2013-05-15 13:50:38 +01:00

watchdog.c

watchdog: Add comments to explain the watchdog_disabled variable

2013-03-14 08:24:05 +01:00

workqueue_internal.h

sched: Rename sched.c as sched/core.c in comments and Documentation

2013-06-19 12:58:42 +02:00

workqueue.c

Merge branch 'for-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2013-07-02 19:53:30 -07:00