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0c96c5979a522c3323c30a078a70120e29b5bdbc
android_kernel_samsung_sm8750/kernel
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Thomas Gleixner 0c96c5979a hrtimer: raise softirq unlocked to avoid circular lock dependency 
The scheduler hrtimer bits in 2.6.25 introduced a circular lock
dependency in a rare code path:

=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.25-sched-devel.git-x86-latest.git #19
-------------------------------------------------------
X/2980 is trying to acquire lock:
 (&rq->rq_lock_key#2){++..}, at: [<ffffffff80230146>] task_rq_lock+0x56/0xa0

but task is already holding lock:
 (&cpu_base->lock){++..}, at: [<ffffffff80257ae1>] lock_hrtimer_base+0x31/0x60

which lock already depends on the new lock.

The scenario which leads to this is:

posix-timer signal is delivered
 -> posix-timer is rearmed
    timer is already expired in hrtimer_enqueue()
     -> softirq is raised

To prevent this we need to move the raise of the softirq out of the
base->lock protected code path.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2008-04-28 22:22:21 +02:00
..
irq
cpumask: Cleanup more uses of CPU_MASK and NODE_MASK
2008-04-19 19:44:58 +02:00
power
PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch
2008-04-28 08:58:36 -07:00
time
softlockup: fix NOHZ wakeup
2008-04-25 00:25:08 +02:00
.gitignore
Update kernel/.gitignore with new auto-generated files
2008-02-09 23:27:01 -08:00
acct.c
bsd_acct: using task_struct->tgid is not right in pid-namespaces
2008-03-24 19:22:20 -07:00
audit_tree.c
Introduce path_put()
2008-02-14 21:13:33 -08:00
audit.c
Audit: internally use the new LSM audit hooks
2008-04-19 09:52:37 +10:00
audit.h
SELinux: use new audit hooks, remove redundant exports
2008-04-19 09:53:46 +10:00
auditfilter.c
Audit: Final renamings and cleanup
2008-04-19 09:59:43 +10:00
auditsc.c
Audit: Final renamings and cleanup
2008-04-19 09:59:43 +10:00
backtracetest.c
x86: add a simple backtrace test module
2008-01-30 13:33:08 +01:00
bounds.c
mm: Get rid of __ZONE_COUNT
2008-04-28 08:58:22 -07:00
capability.c
Add 64-bit capability support to the kernel
2008-02-05 09:44:20 -08:00
cgroup_debug.c
Task Control Groups: simple task cgroup debug info subsystem
2007-10-19 11:53:36 -07:00
cgroup.c
cgroup: fix a race condition in manipulating tsk->cg_list
2008-04-18 08:17:57 -07:00
compat.c
generic: reduce stack pressure in sched_affinity
2008-04-19 19:44:59 +02:00
configs.c
use simple_read_from_buffer in kernel/
2007-05-09 12:30:49 -07:00
cpu.c
generic: use new set_cpus_allowed_ptr function
2008-04-19 19:44:58 +02:00
cpuset.c
mempolicy: rename mpol_copy to mpol_dup
2008-04-28 08:58:23 -07:00
delayacct.c
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
dma.c
whitespace fixes: DMA channel allocator
2007-10-18 14:37:24 -07:00
exec_domain.c
whitespace fixes: execution domains
2007-10-18 14:37:26 -07:00
exit.c
mempolicy: rename mpol_free to mpol_put
2008-04-28 08:58:23 -07:00
extable.c
module: Don't report discarded init pages as kernel text.
2008-01-29 17:13:18 +11:00
fork.c
mempolicy: rename mpol_copy to mpol_dup
2008-04-28 08:58:23 -07:00
futex_compat.c
futex_compat __user annotation
2008-03-30 14:18:41 -07:00
futex.c
NULL noise: fs/*, mm/*, kernel/*
2008-03-30 14:18:41 -07:00
hrtimer.c
hrtimer: raise softirq unlocked to avoid circular lock dependency
2008-04-28 22:22:21 +02:00
itimer.c
ITIMER_REAL: convert to use struct pid
2008-02-08 09:22:29 -08:00
kallsyms.c
remove support for un-needed _extratext section
2008-02-06 10:41:01 -08:00
Kconfig.hz
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
Kconfig.preempt
rcu: move PREEMPT_RCU config option back under PREEMPT
2008-03-10 18:01:20 -07:00
kexec.c
vmcoreinfo: add page flags values
2008-04-28 08:58:23 -07:00
kfifo.c
is_power_of_2: kernel/kfifo.c
2007-07-16 09:05:50 -07:00
kgdb.c
kgdb: always use icache flush for sw breakpoints
2008-04-17 20:05:43 +02:00
kmod.c
generic: use new set_cpus_allowed_ptr function
2008-04-19 19:44:58 +02:00
kprobes.c
kprobes: add (un)register_jprobes for batch registration
2008-04-28 08:58:32 -07:00
ksysfs.c
Kobject: convert remaining kobject_unregister() to kobject_put()
2008-01-24 20:40:40 -08:00
kthread.c
Merge branch 'semaphore' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc
2008-04-21 15:41:27 -07:00
latencytop.c
latencytop: optimize LT_BACKTRACEDEPTH loops a bit
2008-04-19 19:44:57 +02:00
lockdep_internals.h
…
lockdep_proc.c
lockdep: Avoid /proc/lockdep & lock_stat infinite output
2007-10-11 22:11:11 +02:00
lockdep.c
Subject: lockdep: include all lock classes in all_lock_classes
2008-02-25 23:03:02 +01:00
Makefile
Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-kgdb
2008-04-18 08:37:01 -07:00
marker.c
markers: use synchronize_sched()
2008-04-02 15:28:19 -07:00
module.c
kernel: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:17:04 -04:00
mutex-debug.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
mutex-debug.h
…
mutex.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
mutex.h
…
notifier.c
kernel/notifier.c should #include <linux/reboot.h>
2008-02-06 10:41:02 -08:00
ns_cgroup.c
cgroups: implement namespace tracking subsystem
2007-10-19 11:53:37 -07:00
nsproxy.c
namespaces: move the IPC namespace under IPC_NS option
2008-02-08 09:22:23 -08:00
panic.c
ACPI: Taint kernel on ACPI table override (format corrected)
2008-02-06 22:07:51 -05:00
params.c
Add new string functions strict_strto* and convert kernel params to use them
2008-02-08 09:22:41 -08:00
pid_namespace.c
namespaces: cleanup the code managed with PID_NS option
2008-02-08 09:22:23 -08:00
pid.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
pm_qos_params.c
pm qos infrastructure and interface
2008-02-05 09:44:22 -08:00
posix-cpu-timers.c
posix-timers: fix shadowed variables
2008-04-17 12:22:30 +02:00
posix-timers.c
kernel: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:17:04 -04:00
printk.c
Fix locking bug in "acquire_console_semaphore_for_printk()"
2008-04-15 13:09:54 -07:00
profile.c
kernel: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:17:04 -04:00
ptrace.c
ptrace: compat_ptrace_request siginfo
2008-04-21 15:53:41 -07:00
rcuclassic.c
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
rcupdate.c
rcupdate: fix comment
2008-02-13 16:21:18 -08:00
rcupreempt_trace.c
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
rcupreempt.c
generic: reduce stack pressure in sched_affinity
2008-04-19 19:44:59 +02:00
rcutorture.c
generic: use new set_cpus_allowed_ptr function
2008-04-19 19:44:58 +02:00
relay.c
relay: set an spd_release() hook for splice
2008-03-26 12:04:09 +01:00
res_counter.c
Memory Resource Controller use strstrip while parsing arguments
2008-03-04 16:35:09 -08:00
resource.c
PCI: clean up resource alignment management
2008-04-20 21:47:08 -07:00
rtmutex_common.h
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.c
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.h
…
rtmutex-tester.c
Driver core: change sysdev classes to use dynamic kobject names
2008-01-24 20:40:40 -08:00
rtmutex.c
hrtimer: more hrtimer_init_sleeper() fallout.
2008-02-13 15:45:36 +01:00
rtmutex.h
…
rwsem.c
sched: mark rwsem functions as __sched for wchan/profiling
2007-12-18 15:21:13 +01:00
sched_debug.c
sched: build fix
2008-04-19 19:45:01 +02:00
sched_fair.c
sched: debug: show a weight tree
2008-04-19 19:45:00 +02:00
sched_features.h
sched: /debug/sched_features
2008-04-19 19:45:00 +02:00
sched_idletask.c
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
sched_rt.c
sched: rt-group: optimize dequeue_rt_stack
2008-04-19 19:45:00 +02:00
sched_stats.h
cpumask: use new cpus_scnprintf function
2008-04-19 19:44:59 +02:00
sched.c
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
2008-04-25 12:50:00 -07:00
seccomp.c
make seccomp zerocost in schedule
2007-07-16 09:05:50 -07:00
semaphore.c
Improve semaphore documentation
2008-04-17 10:43:01 -04:00
signal.c
trivial: small cleanups
2008-04-21 22:15:06 +00:00
softirq.c
tasklets: execute tasklets in the same order they were queued
2008-04-19 19:44:58 +02:00
softlockup.c
softlockup: fix task state setting
2008-02-29 18:46:53 +01:00
spinlock.c
spinlock: lockbreak cleanup
2008-01-30 13:31:20 +01:00
srcu.c
make srcu_readers_active() static
2008-02-06 10:41:02 -08:00
stacktrace.c
…
stop_machine.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/juhl/trivial
2008-04-21 16:36:46 -07:00
sys_ni.c
timerfd: new timerfd API
2008-02-05 09:44:07 -08:00
sys.c
capabilities: implement per-process securebits
2008-04-28 08:58:26 -07:00
sysctl_check.c
constify tables in kernel/sysctl_check.c
2008-02-08 09:22:31 -08:00
sysctl.c
sched: rt-group: synchonised bandwidth period
2008-04-19 19:44:57 +02:00
taskstats.c
kernel/taskstats.c: fix bogus nlmsg_free()
2007-11-14 18:45:44 -08:00
test_kprobes.c
kprobes: kretprobe user entry-handler
2008-02-06 10:41:11 -08:00
time.c
time: Export set_normalized_timespec.
2008-04-21 19:45:12 -07:00
timeconst.pl
timeconst.pl: correct reversal of USEC_TO_HZ and HZ_TO_USEC
2008-02-12 14:29:26 -08:00
timer.c
timers: simplify lockdep handling
2008-04-17 12:22:31 +02:00
tsacct.c
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
uid16.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
user_namespace.c
namespaces: cleanup the code managed with the USER_NS option
2008-02-08 09:22:23 -08:00
user.c
sched: fix the task_group hierarchy for UID grouping
2008-04-19 19:45:00 +02:00
utsname_sysctl.c
Isolate the UTS namespace's domainname and hostname back
2007-11-29 09:24:53 -08:00
utsname.c
Fix UTS corruption during clone(CLONE_NEWUTS)
2007-09-19 11:24:17 -07:00
wait.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
workqueue.c
timer_list: add annotations to workqueue.c
2008-04-17 12:22:30 +02:00