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android_kernel_xiaomi_sm8350/kernel
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Peter Zijlstra c33a0bc4e4 perf_counter: fix race in perf_output_* 
When two (or more) contexts output to the same buffer, it is possible
to observe half written output.

Suppose we have CPU0 doing perf_counter_mmap(), CPU1 doing
perf_counter_overflow(). If CPU1 does a wakeup and exposes head to
user-space, then CPU2 can observe the data CPU0 is still writing.

[ Impact: fix occasionally corrupted profiling records ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090501102533.007821627@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-05-01 13:23:43 +02:00
..
irq x86, irq: Remove IRQ_DISABLED check in process context IRQ move 2009-04-14 15:21:13 +02:00
power PM/Hibernate: Fix waiting for image device to appear on resume 2009-04-24 15:31:30 -07:00
time clocksource: add enable() and disable() callbacks 2009-04-21 13:41:47 -07:00
trace tracing: Fix branch tracer header 2009-04-14 02:30:36 +02:00
.gitignore
acct.c
async.c async: remove the temporary (2.6.29) "async is off by default" code 2009-03-28 13:05:30 -07:00
audit_tree.c No need for crossing to mountpoint in audit_tag_tree() 2009-04-20 23:01:15 -04:00
audit.c Audit: remove spaces from audit_log_d_path 2009-04-05 13:49:04 -04:00
audit.h
auditfilter.c make the e->rule.xxx shorter in kernel auditfilter.c 2009-04-05 13:40:33 -04:00
auditsc.c Audit: remove spaces from audit_log_d_path 2009-04-05 13:49:04 -04:00
backtracetest.c
bounds.c
capability.c
cgroup_debug.c debug cgroup: remove unneeded cgroup_lock 2009-04-02 19:04:54 -07:00
cgroup_freezer.c
cgroup.c memcg: fix OOM killer under memcg 2009-04-02 19:04:55 -07:00
compat.c signals: implement sys_rt_tgsigqueueinfo 2009-04-30 19:24:24 +02:00
configs.c
cpu.c cpumask: use set_cpu_active in init/main.c 2009-03-30 22:05:12 +10:30
cpuset.c cpusets: prevent PF_THREAD_BOUND tasks from attaching to non-root cpusets 2009-04-02 19:04:57 -07:00
cred-internals.h
cred.c
delayacct.c
dma-coherent.c
dma.c
exec_domain.c Get rid of indirect include of fs_struct.h 2009-03-31 23:00:27 -04:00
exit.c Merge commit 'v2.6.30-rc1' into perfcounters/core 2009-04-08 10:35:30 +02:00
extable.c Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-05 11:04:19 -07:00
fork.c Merge branch 'linus' into perfcounters/core 2009-04-29 14:47:05 +02:00
freezer.c
futex_compat.c
futex.c futex: comment requeue key reference semantics 2009-04-02 23:39:53 +02:00
hrtimer.c hrtimer: fix rq->lock inversion (again) 2009-03-31 14:52:52 +02:00
hung_task.c
itimer.c
kallsyms.c Ksplice: Add functions for walking kallsyms symbols 2009-03-31 13:05:32 +10:30
Kconfig.freezer
Kconfig.hz
Kconfig.preempt
kexec.c kexec: vmcoreinfo_data[] can become static 2009-04-02 19:05:04 -07:00
kfifo.c
kgdb.c
kmod.c module: create a request_module_nowait() 2009-03-31 13:05:35 +10:30
kprobes.c kprobes: support per-kprobe disabling 2009-04-07 08:31:08 -07:00
ksysfs.c
kthread.c kthread: move sched-realeted initialization from kthreadd context 2009-04-09 09:50:37 +09:30
latencytop.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
lockdep.c lockdep: more robust lockdep_map init sequence 2009-04-17 18:00:00 +02:00
Makefile Merge commit 'v2.6.30-rc1' into perfcounters/core 2009-04-08 10:35:30 +02:00
marker.c
module.c async: Fix module loading async-work regression 2009-04-11 12:44:49 -07:00
mutex-debug.c
mutex-debug.h
mutex.c Merge branch 'linus' into perfcounters/core 2009-04-29 14:47:05 +02:00
mutex.h
notifier.c
ns_cgroup.c cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups 2009-04-02 19:04:53 -07:00
nsproxy.c
panic.c locking: clarify kernel-taint warning message 2009-04-23 09:36:52 +02:00
params.c param: fix charp parameters set via sysfs 2009-03-31 13:05:30 +10:30
perf_counter.c perf_counter: fix race in perf_output_* 2009-05-01 13:23:43 +02:00
pid_namespace.c signals: zap_pid_ns_process() should use force_sig() 2009-04-02 19:04:58 -07:00
pid.c pids: refactor vnr/nr_ns helpers to make them safe 2009-04-02 19:05:02 -07:00
pm_qos_params.c
posix-cpu-timers.c Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-09 10:37:28 -07:00
posix-timers.c
printk.c Merge branch 'printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-05 10:23:25 -07:00
profile.c
ptrace.c ptrace: ptrace_attach: fix the usage of ->cred_exec_mutex 2009-04-27 20:30:51 +10:00
rcuclassic.c kmemtrace, rcu: fix linux/rcutree.h and linux/rcuclassic.h dependencies 2009-04-03 12:23:02 +02:00
rcupdate.c RCU: Don't try and predeclare inline funcs as it upsets some versions of gcc 2009-04-15 13:55:14 -07:00
rcupreempt_trace.c
rcupreempt.c kmemtrace, rcu: fix rcupreempt.c data structure dependencies 2009-04-03 12:23:04 +02:00
rcutorture.c cpumask: convert rcutorture.c 2009-03-30 22:05:16 +10:30
rcutree_trace.c rcu: Make hierarchical RCU less IPI-happy 2009-04-14 11:31:50 +02:00
rcutree.c rcu: Make hierarchical RCU less IPI-happy 2009-04-14 11:31:50 +02:00
rcutree.h kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies 2009-04-03 12:23:03 +02:00
relay.c Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-05 11:04:19 -07:00
res_counter.c
resource.c Remove 'recurse into child resources' logic from 'reserve_region_with_split()' 2009-04-18 21:44:24 -07:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rwsem.c
sched_clock.c Merge branch 'tracing/core-v2' into tracing-for-linus 2009-04-02 00:49:02 +02:00
sched_cpupri.c sched_rt: don't allocate cpumask in fastpath 2009-04-01 13:24:51 +02:00
sched_cpupri.h cpumask: remove cpumask_t from core 2009-03-30 22:05:17 +10:30
sched_debug.c sched: remove unused fields from struct rq 2009-03-24 23:16:51 +01:00
sched_fair.c
sched_features.h Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-03-30 17:17:35 -07:00
sched_idletask.c
sched_rt.c Merge commit 'v2.6.30-rc1' into sched/urgent 2009-04-08 17:26:00 +02:00
sched_stats.h sched: remove unused fields from struct rq 2009-03-24 23:16:51 +01:00
sched.c Merge branch 'linus' into perfcounters/core 2009-04-29 14:47:05 +02:00
seccomp.c
semaphore.c
signal.c signals: implement sys_rt_tgsigqueueinfo 2009-04-30 19:24:24 +02:00
slow-work.c Delete slow-work timers properly 2009-04-24 07:47:59 -07:00
smp.c generic-ipi: eliminate WARN_ON()s during oops/panic 2009-03-13 10:47:34 +01:00
softirq.c kernel/softirq.c: fix sparse warning 2009-04-17 01:57:54 +02:00
softlockup.c
spinlock.c Allow rwlocks to re-enable interrupts 2009-04-02 19:05:11 -07:00
srcu.c
stacktrace.c
stop_machine.c cpumask: remove cpumask_t from core 2009-03-30 22:05:17 +10:30
sys_ni.c
sys.c Merge branch 'linus' into perfcounters/core 2009-04-29 14:47:05 +02:00
sysctl_check.c
sysctl.c Merge branch 'linus' into perfcounters/core 2009-04-29 14:47:05 +02:00
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c Merge branch 'linus' into perfcounters/core 2009-04-29 14:47:05 +02:00
tracepoint.c tracepoints: dont update zero-sized tracepoint sections 2009-03-18 19:55:00 +01:00
tsacct.c Fix fixpoint divide exception in acct_update_integrals 2009-03-09 08:13:35 -07:00
uid16.c
up.c
user_namespace.c
user.c Merge branch 'master' into next 2009-03-24 10:52:46 +11:00
utsname_sysctl.c proc_sysctl: use CONFIG_PROC_SYSCTL around ipc and utsname proc_handlers 2009-04-02 19:05:01 -07:00
utsname.c
wait.c
workqueue.c work_on_cpu(): rewrite it to create a kernel thread on demand 2009-04-09 09:50:37 +09:30