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Frederic Weisbecker e5ab012c32 nohz: Make tick_nohz_irq_exit() irq safe ... As it stands, irq_exit() may or may not be called with irqs disabled, depending on __ARCH_IRQ_EXIT_IRQS_DISABLED that the arch can define. It makes tick_nohz_irq_exit() unsafe. For example two interrupts can race in tick_nohz_stop_sched_tick(): the inner most one computes the expiring time on top of the timer list, then it's interrupted right before reprogramming the clock. The new interrupt enqueues a new timer list timer, it reprogram the clock to take it into account and it exits. The CPUs resumes the inner most interrupt and performs the clock reprogramming without considering the new timer list timer. This regression has been introduced by: 280f06774a ("nohz: Separate out irq exit and idle loop dyntick logic") Let's fix it right now with the appropriate protections. A saner long term solution will be to remove __ARCH_IRQ_EXIT_IRQS_DISABLED and mandate that irq_exit() is called with interrupts disabled. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linuxfoundation.org> Cc: <stable@vger.kernel.org> #v3.2+ Link: http://lkml.kernel.org/r/1361373336-11337-1-git-send-email-fweisbec@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		12 years ago
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debug	module: add new state MODULE_STATE_UNFORMED.	12 years ago
events	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
gcov	…
irq	Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
power	Merge branch 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	12 years ago
sched	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
time	nohz: Make tick_nohz_irq_exit() irq safe	12 years ago
trace	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	locking: Adjust spin lock inlining Kconfig options	13 years ago
Kconfig.preempt	…
Makefile	Nothing all that exciting; a new module-from-fd syscall for those who want	12 years ago
acct.c	cputime: Use accessors to read task cputime stats	12 years ago
async.c	async: fix __lowest_in_progress()	12 years ago
audit.c	kernel/audit.c: avoid negative sleep durations	12 years ago
audit.h	audit: optimize audit_compare_dname_path	12 years ago
audit_tree.c	audit: catch possible NULL audit buffers	12 years ago
audit_watch.c	audit: catch possible NULL audit buffers	12 years ago
auditfilter.c	audit: fix auditfilter.c kernel-doc warnings	12 years ago
auditsc.c	audit: catch possible NULL audit buffers	12 years ago
backtracetest.c	…
bounds.c	…
capability.c	…
cgroup.c	Merge branch 'akpm' (Andrew's patch-bomb)	12 years ago
cgroup_freezer.c	cgroup: rename ->create/post_create/pre_destroy/destroy() to ->css_alloc/online/offline/free()	12 years ago
compat.c	x32: fix sigtimedwait	12 years ago
configs.c	…
context_tracking.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
cpu.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
cpu_pm.c	…
cpuset.c	cpuset: use N_MEMORY instead N_HIGH_MEMORY	12 years ago
crash_dump.c	…
cred.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	12 years ago
delayacct.c	cputime: Use accessors to read task cputime stats	12 years ago
dma.c	…
elfcore.c	…
exec_domain.c	…
exit.c	cputime: Use accessors to read task cputime stats	12 years ago
extable.c	…
fork.c	This implements the cputime accounting on full dynticks CPUs.	12 years ago
freezer.c	freezer: change ptrace_stop/do_signal_stop to use freezable_schedule()	12 years ago
futex.c	sched/rt: Move rt specific bits into new header file	12 years ago
futex_compat.c	…
groups.c	…
hrtimer.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
hung_task.c	…
irq_work.c	Merge branch 'nohz/printk-v8' into irq/core	12 years ago
itimer.c	…
jump_label.c	jump_label: Export jump_label_rate_limit()	13 years ago
kallsyms.c	…
kcmp.c	kcmp: include linux/ptrace.h	12 years ago
kexec.c	kdump: remove unneeded include	13 years ago
kfifo.c	…
kmod.c	Bury the conditionals from kernel_thread/kernel_execve series	12 years ago
kprobes.c	kprobes/x86: Move ftrace-based kprobe code into kprobes-ftrace.c	12 years ago
ksysfs.c	Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
kthread.c	kthread: use N_MEMORY instead N_HIGH_MEMORY	12 years ago
latencytop.c	…
lglock.c	…
lockdep.c	lockdep: Check if nested lock is actually held	13 years ago
lockdep_internals.h	…
lockdep_proc.c	lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()	12 years ago
lockdep_states.h	…
modsign_certificate.S	MODSIGN: Avoid using .incbin in C source	12 years ago
modsign_pubkey.c	keys: use keyring_alloc() to create module signing keyring	12 years ago
module-internal.h	MODSIGN: Move the magic string to the end of a module and eliminate the search	12 years ago
module.c	module: fix missing module_mutex unlock	12 years ago
module_signing.c	MODSIGN: Don't use enum-type bitfields in module signature info block	12 years ago
mutex-debug.c	…
mutex-debug.h	…
mutex.c	sched/rt: Move rt specific bits into new header file	12 years ago
mutex.h	…
notifier.c	…
nsproxy.c	userns: Implement unshare of the user namespace	12 years ago
padata.c	padata: use __this_cpu_read per-cpu helper	12 years ago
panic.c	panic: fix a possible deadlock in panic()	13 years ago
params.c	…
pid.c	kernel/pid.c: reenable interrupts when alloc_pid() fails because init has exited	12 years ago
pid_namespace.c	pidns: Stop pid allocation when init dies	12 years ago
posix-cpu-timers.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
posix-timers.c	posix-timers: Fix clock_adjtime to always return timex data on success	12 years ago
printk.c	Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
profile.c	profiling: Remove unused timer hook	12 years ago
ptrace.c	uprobes: Add exports for module use	12 years ago
range.c	…
rcu.h	rcu: Provide RCU CPU stall warnings for tiny RCU	12 years ago
rcupdate.c	Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD	12 years ago
rcutiny.c	Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD	12 years ago
rcutiny_plugin.h	rcu: Provide RCU CPU stall warnings for tiny RCU	12 years ago
rcutorture.c	rcu: Allow rcutorture to be built at low optimization levels	12 years ago
rcutree.c	Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD	12 years ago
rcutree.h	Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD	12 years ago
rcutree_plugin.h	rcu: Make rcu_nocb_poll an early_param instead of module_param	12 years ago
rcutree_trace.c	rcu: Separate accounting of callbacks from callback-free CPUs	12 years ago
relay.c	…
res_counter.c	res_counter: return amount of charges after res_counter_uncharge()	12 years ago
resource.c	kernel/resource.c: fix stack overflow in __reserve_region_with_split()	13 years ago
rtmutex-debug.c	sched/rt: Move rt specific bits into new header file	12 years ago
rtmutex-debug.h	…
rtmutex-tester.c	sched/rt: Move rt specific bits into new header file	12 years ago
rtmutex.c	sched/rt: Move rt specific bits into new header file	12 years ago
rtmutex.h	…
rtmutex_common.h	…
rwsem.c	lockdep, rwsem: provide down_write_nest_lock()	12 years ago
seccomp.c	seccomp: Make syscall skipping and nr changes more consistent	13 years ago
semaphore.c	…
signal.c	This implements the cputime accounting on full dynticks CPUs.	12 years ago
smp.c	smp: Fix SMP function call empty cpu mask race	12 years ago
smpboot.c	smpboot: Allow selfparking per cpu threads	12 years ago
smpboot.h	smpboot: Provide infrastructure for percpu hotplug threads	13 years ago
softirq.c	cputime: Safely read cputime of full dynticks CPUs	12 years ago
spinlock.c	…
srcu.c	srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()	12 years ago
stacktrace.c	…
stop_machine.c	stop_machine: Use smpboot threads	12 years ago
sys.c	cputime: Rename thread_group_times to thread_group_cputime_adjusted	12 years ago
sys_ni.c	module: add syscall to load module from fd	12 years ago
sysctl.c	sched/rt: Add a tuning knob to allow changing SCHED_RR timeslice	12 years ago
sysctl_binary.c	pidns: Use task_active_pid_ns where appropriate	12 years ago
task_work.c	task_work: task_work_add() should not succeed after exit_task_work()	13 years ago
taskstats.c	taskstats: cgroupstats_user_cmd() may leak on error	13 years ago
test_kprobes.c	…
time.c	time, Fix setting of hardware clock in NTP code	12 years ago
timeconst.pl	timeconst.pl: Eliminate Perl warning	12 years ago
timer.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	12 years ago
tracepoint.c	…
tsacct.c	cputime: Use accessors to read task cputime stats	12 years ago
uid16.c	…
up.c	…
user-return-notifier.c	…
user.c	proc: Usable inode numbers for the namespace file descriptors.	12 years ago
user_namespace.c	userns: Fix typo in description of the limitation of userns_install	12 years ago
utsname.c	userns: Require CAP_SYS_ADMIN for most uses of setns.	12 years ago
utsname_sysctl.c	…
wait.c	propagate name change to comments in kernel source	12 years ago
watchdog.c	sched/rt: Move rt specific bits into new header file	12 years ago
workqueue.c	Merge branch 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	12 years ago
workqueue_sched.h	…