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Rafael J. Wysocki 25f2f3daad snapshot: Use pm_mutex for mutual exclusion 
We can avoid taking the BKL in snapshot_ioctl() if pm_mutex is used to prevent
the ioctls from being executed concurrently.

In addition, although it is only possible to open /dev/snapshot once, the task
which has done that may spawn a child that will inherit the open descriptor,
so in theory they can call snapshot_write(), snapshot_read() and
snapshot_release() concurrently.  pm_mutex can also be used for mutual
exclusion in such cases.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-07-16 23:27:03 +02:00
..
irq
genirq: remove extraneous checks in manage.c
2008-07-10 07:01:13 +02:00
power
snapshot: Use pm_mutex for mutual exclusion
2008-07-16 23:27:03 +02:00
time
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
trace
Merge branch 'tracing/ftrace' into auto-ftrace-next
2008-07-14 15:58:35 +02:00
.gitignore
…
acct.c
…
audit_tree.c
[PATCH] list_for_each_rcu must die: audit
2008-05-17 03:30:23 -04:00
audit.c
[PATCH] remove useless argument type in audit_filter_user()
2008-06-24 23:36:35 -04:00
audit.h
…
auditfilter.c
[PATCH] remove useless argument type in audit_filter_user()
2008-06-24 23:36:35 -04:00
auditsc.c
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backtracetest.c
backtrace: replace timer with tasklet + completions
2008-06-27 18:09:16 +02:00
bounds.c
Add kbuild.h that contains common definitions for kbuild users
2008-04-29 08:06:29 -07:00
capability.c
security: filesystem capabilities: fix fragile setuid fixup code
2008-07-04 10:40:08 -07:00
cgroup_debug.c
…
cgroup.c
cgroups: remove node_ prefix_from ns subsystem
2008-05-24 09:56:14 -07:00
compat.c
ntp: support for TAI
2008-05-01 08:03:59 -07:00
configs.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
cpu.c
force offline the processor during hot-removal
2008-07-16 23:27:01 +02:00
cpuset.c
Merge commit 'v2.6.26' into sched/devel
2008-07-14 12:19:19 +02:00
delayacct.c
…
dma.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
exec_domain.c
…
exit.c
block: blkdev.h cleanup, move iocontext stuff to iocontext.h
2008-07-03 13:21:14 +02:00
extable.c
…
fork.c
Merge branch 'core/locking' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-14 14:55:13 -07:00
futex_compat.c
…
futex.c
futexes: fix fault handling in futex_lock_pi
2008-06-23 13:31:15 +02:00
hrtimer.c
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
itimer.c
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kallsyms.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
Kconfig.hz
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Kconfig.preempt
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kexec.c
kexec: make extended crashkernel= syntax less confusing
2008-05-01 08:04:00 -07:00
kfifo.c
…
kgdb.c
kgdb: sparse fix
2008-06-24 10:52:55 -05:00
kmod.c
[PATCH] split linux/file.h
2008-05-01 13:08:16 -04:00
kprobes.c
kernel/kprobes.c: Made kprobe_blacklist static.
2008-07-10 10:13:51 -07:00
ksysfs.c
…
kthread.c
Freezer: Introduce PF_FREEZER_NOSIG
2008-07-16 23:27:03 +02:00
latencytop.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep_internals.h
lockdep: add lock_class information to lock_chain and output it
2008-06-24 01:28:20 +02:00
lockdep_proc.c
lockdep: add lock_class information to lock_chain and output it
2008-06-24 01:28:20 +02:00
lockdep.c
Merge branch 'core/locking' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-14 14:55:13 -07:00
Makefile
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
marker.c
Markers - remove extra format argument
2008-05-23 22:25:27 +02:00
module.c
modules: proper cleanup of kobject without CONFIG_SYSFS
2008-05-23 13:09:33 +10:00
mutex-debug.c
mutex-debug: check mutex magic before owner
2008-05-16 16:53:35 +02:00
mutex-debug.h
…
mutex.c
__mutex_lock_common: use signal_pending_state()
2008-06-10 11:45:09 +02:00
mutex.h
…
notifier.c
ipc: re-enable msgmni automatic recomputing msgmni if set to negative
2008-04-29 08:06:13 -07:00
ns_cgroup.c
…
nsproxy.c
ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)
2008-04-29 08:06:14 -07:00
panic.c
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params.c
…
pid_namespace.c
pidns: make pid->level and pid_ns->level unsigned
2008-04-30 08:29:49 -07:00
pid.c
rcu: split list.h and move rcu-protected lists into rculist.h
2008-05-19 10:01:37 +02:00
pm_qos_params.c
pm_qos_params: BKL pushdown
2008-07-02 15:06:24 -06:00
posix-cpu-timers.c
posix-timers: print RT watchdog message
2008-05-24 18:49:22 +02:00
posix-timers.c
signals: join send_sigqueue() with send_group_sigqueue()
2008-04-30 08:29:36 -07:00
printk.c
Merge branch 'core/printk' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-14 15:27:43 -07:00
profile.c
on_each_cpu(): kill unused 'retry' parameter
2008-06-26 11:24:38 +02:00
ptrace.c
Security: split proc ptrace checking into read vs. attach
2008-07-14 15:01:47 +10:00
rcuclassic.c
Merge branch 'core/rcu' into core/rcu-for-linus
2008-07-15 21:10:12 +02:00
rcupdate.c
Merge branch 'generic-ipi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-15 14:12:03 -07:00
rcupreempt_trace.c
rcu: remove duplicated include in kernel/rcupreempt_trace.c
2008-05-19 10:03:39 +02:00
rcupreempt.c
Merge branch 'core/rcu' into core/rcu-for-linus
2008-07-15 21:10:12 +02:00
rcutorture.c
rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)
2008-06-26 09:24:33 +02:00
relay.c
splice: fix sendfile() issue with relay
2008-05-28 14:49:27 +02:00
res_counter.c
memcgroup: add the max_usage member on the res_counter
2008-04-29 08:06:10 -07:00
resource.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -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 'sched/clock' into sched/devel
2008-07-14 12:19:13 +02:00
sched_cpupri.c
sched: use a 2-d bitmap for searching lowest-pri CPU
2008-06-06 15:19:28 +02:00
sched_cpupri.h
sched: fix the cpuprio count really
2008-06-06 15:19:44 +02:00
sched_debug.c
sched: add full schedstats to /proc/sched_debug
2008-06-27 14:31:31 +02:00
sched_fair.c
sched: add avg-overlap support to RT tasks
2008-07-04 12:50:22 +02:00
sched_features.h
sched: bias effective_load() error towards failing wake_affine().
2008-06-27 14:31:47 +02:00
sched_idletask.c
sched: make rt_sched_class, idle_sched_class static
2008-05-05 23:56:17 +02:00
sched_rt.c
sched: make sched_{rt,fair}.c ifdefs more readable
2008-06-27 14:32:05 +02:00
sched_stats.h
sched: fix accounting in task delay accounting & migration
2008-07-04 12:50:23 +02:00
sched.c
Merge branch 'core/softirq' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-14 15:28:42 -07:00
seccomp.c
…
semaphore.c
mmiotrace broken in linux-next (8-bit writes only)
2008-07-01 10:14:06 +02:00
signal.c
posix timers: discard SI_TIMER signals on exec
2008-05-26 10:37:07 -07:00
smp.c
generic ipi function calls: wait on alloc failure fallback
2008-07-15 14:12:20 -07:00
softirq.c
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
softlockup.c
softlockup: print a module list on being stuck
2008-07-05 08:51:24 +02:00
spinlock.c
ftrace: lockdep notrace annotations
2008-05-23 20:39:40 +02:00
srcu.c
…
stacktrace.c
stacktrace: fix modular build, export print_stack_trace and save_stack_trace
2008-06-30 09:20:55 +02:00
stop_machine.c
sched: add new API sched_setscheduler_nocheck: add a flag to control access checks
2008-06-23 22:57:56 +02:00
sys_ni.c
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sys.c
sys_prctl(): fix return of uninitialized value
2008-05-24 09:56:13 -07:00
sysctl_check.c
…
sysctl.c
Merge branch 'core/rcu' into core/rcu-for-linus
2008-07-15 21:10:12 +02:00
taskstats.c
Use find_task_by_vpid in taskstats
2008-04-30 08:29:48 -07:00
test_kprobes.c
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time.c
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timeconst.pl
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timer.c
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
2008-07-14 16:06:58 -07:00
tsacct.c
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uid16.c
…
user_namespace.c
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user.c
alloc_uid: cleanup
2008-04-30 08:29:53 -07:00
utsname_sysctl.c
…
utsname.c
…
wait.c
…
workqueue.c
Christoph has moved
2008-07-04 10:40:04 -07:00