Jason Baron 5cd08fbfdb sched: Fix static_key race with sched_feat() ...

As pointed out by Andi Kleen, the usage of static keys can be racy in
sched_feat_disable() vs. sched_feat_enable(). Currently, we first check the
value of keys->enabled, and subsequently update the branch direction. This,
can be racy and can potentially leave the keys in an inconsistent state.

Take the i_mutex around these calls to resolve the race.

Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: rostedt@goodmis.org
Link: http://lkml.kernel.org/r/9d7780c83db26683955cd01e6bc654ee2586e67f.1404315388.git.jbaron@akamai.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2014-07-16 13:38:21 +02:00

..

debug

kernel/printk: use symbolic defines for console loglevels

2014-06-04 16:54:17 -07:00

events

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

2014-06-12 19:18:49 -07:00

gcov

gcov: add support for GCC 4.9

2014-06-10 15:34:46 -07:00

irq

genirq: Improve documentation to match current implementation

2014-05-27 10:16:44 +02:00

locking

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

2014-06-12 18:48:15 -07:00

power

Merge branch 'pm-sleep'

2014-06-12 13:43:08 +02:00

printk

kernel/printk: use symbolic defines for console loglevels

2014-06-04 16:54:17 -07:00

rcu

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

2014-06-03 12:57:53 -07:00

sched

sched: Fix static_key race with sched_feat()

2014-07-16 13:38:21 +02:00

time

nohz: Support nohz full remote kick

2014-06-16 16:26:54 +02:00

trace

Merge tag 'trace-3.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2014-06-12 21:07:25 -07:00

.gitignore

…

acct.c

ipc, kernel: clear whitespace

2014-06-06 16:08:14 -07:00

async.c

…

audit_tree.c

…

audit_watch.c

…

audit.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2014-06-12 14:27:40 -07:00

audit.h

…

auditfilter.c

Merge git://git.infradead.org/users/eparis/audit

2014-04-12 12:38:53 -07:00

auditsc.c

auditsc: audit_krule mask accesses need bounds checking

2014-06-10 08:44:40 -07:00

backtracetest.c

kernel/backtracetest.c: replace no level printk by pr_info()

2014-06-04 16:54:14 -07:00

bounds.c

…

capability.c

fs,userns: Change inode_capable to capable_wrt_inode_uidgid

2014-06-10 13:57:22 -07:00

cgroup_freezer.c

cgroup: remove css_parent()

2014-05-16 13:22:48 -04:00

cgroup.c

Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2014-06-09 15:03:33 -07:00

compat.c

kernel/compat.c: use sizeof() instead of sizeof

2014-06-04 16:54:19 -07:00

configs.c

…

context_tracking.c

asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*

2014-05-05 16:07:46 -07:00

cpu_pm.c

…

cpu.c

sched: Rework check_for_tasks()

2014-07-05 11:17:45 +02:00

cpuset.c

Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2014-06-09 15:03:33 -07:00

crash_dump.c

…

cred.c

…

delayacct.c

…

dma.c

…

elfcore.c

…

exec_domain.c

kernel/exec_domain.c: code clean-up

2014-06-04 16:54:15 -07:00

exit.c

signals: mv {dis,}allow_signal() from sched.h/exit.c to signal.[ch]

2014-06-06 16:08:11 -07:00

extable.c

…

fork.c

sched/deadline: Kill task_struct->pi_top_task

2014-07-16 13:38:18 +02:00

freezer.c

…

futex_compat.c

…

futex.c

Merge branch 'next' (accumulated 3.16 merge window patches) into master

2014-06-08 11:31:16 -07:00

groups.c

…

hrtimer.c

Merge branch 'perf/urgent' into perf/core, to resolve conflict and to prepare for new patches

2014-06-06 07:55:06 +02:00

hung_task.c

kernel/hung_task.c: convert simple_strtoul to kstrtouint

2014-06-04 16:54:15 -07:00

irq_work.c

irq_work: Remove BUG_ON in irq_work_run()

2014-07-05 11:17:26 +02:00

itimer.c

…

jump_label.c

…

kallsyms.c

…

kcmp.c

…

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

locking/rwlocks: Introduce 'qrwlocks' - fair, queued rwlocks

2014-06-06 07:58:28 +02:00

Kconfig.preempt

…

kexec.c

kernel/kexec.c: convert printk to pr_foo()

2014-06-06 16:08:12 -07:00

kmod.c

signals: change wait_for_helper() to use kernel_sigaction()

2014-06-06 16:08:12 -07:00

kprobes.c

kprobes: Show blacklist entries via debugfs

2014-04-24 10:26:41 +02:00

ksysfs.c

kobject: Make support for uevent_helper optional.

2014-04-25 12:00:49 -07:00

kthread.c

kthread: fix return value of kthread_create() upon SIGKILL.

2014-06-04 16:53:51 -07:00

latencytop.c

kernel/latencytop.c: convert seq_printf to seq_puts

2014-06-04 16:54:15 -07:00

Makefile

…

module_signing.c

…

module-internal.h

…

module.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2014-06-11 16:09:14 -07:00

notifier.c

kprobes, notifier: Use NOKPROBE_SYMBOL macro in notifier

2014-04-24 10:26:39 +02:00

nsproxy.c

…

padata.c

…

panic.c

kernel/panic.c: add "crash_kexec_post_notifiers" option for kdump after panic_notifers

2014-06-06 16:08:12 -07:00

params.c

param: hand arguments after -- straight to init

2014-04-28 11:48:34 +09:30

pid_namespace.c

…

pid.c

…

posix-cpu-timers.c

…

posix-timers.c

…

profile.c

kernel/profile.c: use static const char instead of static char

2014-06-06 16:08:13 -07:00

ptrace.c

…

range.c

…

reboot.c

kernel/reboot.c: convert simple_strtoul to kstrtoint

2014-06-04 16:54:15 -07:00

relay.c

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

2014-04-12 14:49:50 -07:00

res_counter.c

kernel/res_counter.c: replace simple_strtoull by kstrtoull

2014-06-04 16:54:15 -07:00

resource.c

resources: Clarify sanity check message

2014-05-23 10:47:21 -06:00

seccomp.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2014-06-12 14:27:40 -07:00

signal.c

signals: introduce kernel_sigaction()

2014-06-06 16:08:12 -07:00

smp.c

irq_work: Implement remote queueing

2014-06-16 16:26:54 +02:00

smpboot.c

…

smpboot.h

…

softirq.c

Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

2014-05-22 11:36:10 +02:00

stacktrace.c

…

stop_machine.c

kernel/stop_machine.c: kernel-doc warning fix

2014-06-04 16:54:15 -07:00

sys_ni.c

sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL

2014-06-04 16:54:14 -07:00

sys.c

sched: Consolidate open coded implementations of nice level frobbing into nice_to_rlimit() and rlimit_to_nice()

2014-05-22 11:16:36 +02:00

sysctl_binary.c

…

sysctl.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2014-06-12 14:27:40 -07:00

system_certificates.S

…

system_keyring.c

…

task_work.c

…

taskstats.c

…

test_kprobes.c

…

time.c

…

timeconst.bc

…

timer.c

timer: Prevent overflow in apply_slack

2014-04-30 13:46:17 +02:00

torture.c

torture: Remove __init from torture_init_begin/end

2014-05-14 09:46:30 -07:00

tracepoint.c

kernel/tracepoint.c: kernel-doc fixes

2014-06-04 16:54:15 -07:00

tsacct.c

…

uid16.c

…

up.c

…

user_namespace.c

kernel/user_namespace.c: kernel-doc/checkpatch fixes

2014-06-06 16:08:13 -07:00

user-return-notifier.c

…

user.c

kernel/user.c: drop unused field 'files' from user_struct

2014-06-04 16:54:16 -07:00

utsname_sysctl.c

sysctl: convert use of typedef ctl_table to struct ctl_table

2014-06-06 16:08:16 -07:00

utsname.c

…

watchdog.c

kernel/watchdog.c:touch_softlockup_watchdog(): use raw_cpu_write()

2014-04-18 16:40:08 -07:00

workqueue_internal.h

workqueue: rename manager_mutex to attach_mutex

2014-05-20 10:59:32 -04:00

workqueue.c

Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2014-06-09 14:56:49 -07:00