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Thomas Gleixner 307bf9803f sched: Simplify mutex_spin_on_owner() 
It does not make sense to rcu_read_lock/unlock() in every loop
iteration while spinning on the mutex.

Move the rcu protection outside the loop. Also simplify the
return path to always check for lock->owner == NULL which
meets the requirements of both owner changed and need_resched()
caused loop exits.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1106101458350.11814@ionos
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-07-01 10:39:07 +02:00
..
debug
Fix common misspellings
2011-03-31 11:26:23 -03:00
events
Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
2011-06-04 12:13:06 +02:00
gcov
gcov: disable CONFIG_CONSTRUCTORS when not needed by CONFIG_GCOV_KERNEL
2011-06-15 20:04:01 -07:00
irq
genirq: Prevent potential NULL dereference in irq_set_irq_wake()
2011-06-10 10:53:42 +02:00
power
PM: Free memory bitmaps if opening /dev/snapshot fails
2011-06-21 23:20:06 +02:00
time
alarmtimers: Return -ENOTSUPP if no RTC device is present
2011-06-21 16:32:28 -07:00
trace
tracing: Fix regression in printk_formats file
2011-06-09 08:42:15 -04:00
.gitignore
…
acct.c
pass a struct path to vfs_statfs
2010-08-09 16:48:42 -04:00
async.c
async: use workqueue for worker pool
2010-07-14 11:29:46 +02:00
audit_tree.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
audit_watch.c
kill path_lookup()
2011-03-14 09:15:23 -04:00
audit.c
netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms
2011-03-03 10:55:40 -08:00
audit.h
audit: make functions static
2010-10-30 01:42:19 -04:00
auditfilter.c
netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms
2011-03-03 10:55:40 -08:00
auditsc.c
audit: acquire creds selectively to reduce atomic op overhead
2011-04-27 15:11:03 +02:00
backtracetest.c
…
bounds.c
memcg: remove direct page_cgroup-to-page pointer
2011-03-23 19:46:28 -07:00
capability.c
Merge branch 'master' into next
2011-05-19 18:51:57 +10:00
cgroup_freezer.c
cgroups: add per-thread subsystem callbacks
2011-05-26 17:12:34 -07:00
cgroup.c
cgroup: remove the ns_cgroup
2011-05-26 17:12:34 -07:00
compat.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
2011-05-25 15:35:32 -07:00
configs.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
cpu.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
cpuset.c
cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed
2011-05-28 17:02:57 +02:00
crash_dump.c
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
cred.c
Merge branch 'docs-move' of git://git.kernel.org/pub/scm/linux/kernel/git/rdunlap/linux-docs
2011-05-27 10:25:02 -07:00
delayacct.c
…
dma.c
…
elfcore.c
…
exec_domain.c
sys_personality: remove the bogus checks in sys_personality()->__set_personality() path
2010-08-09 20:45:05 -07:00
exit.c
memcg: clear mm->owner when last possible owner leaves
2011-06-15 20:04:01 -07:00
extable.c
extable, core_kernel_data(): Make sure all archs define _sdata
2011-05-20 08:56:56 +02:00
fork.c
mm: Fix boot crash in mm_alloc()
2011-05-29 11:32:28 -07:00
freezer.c
Freezer: Use SMP barriers
2011-05-17 23:19:17 +02:00
futex_compat.c
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
futex.c
futex: Set FLAGS_HAS_TIMEOUT during futex_wait restart setup
2011-04-15 16:34:32 +02:00
groups.c
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
hrtimer.c
hrtimers: Fix typo causing erratic timers
2011-05-25 15:31:58 -07:00
hung_task.c
watchdog, hung_task_timeout: Add Kconfig configurable default
2011-04-28 09:13:17 +02:00
irq_work.c
irq_work: Use per cpu atomics instead of regular atomics
2010-12-18 15:54:48 +01:00
itimer.c
…
jump_label.c
jump_label: Check entries limit in __jump_label_update
2011-05-25 19:56:36 -04:00
kallsyms.c
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-25 17:52:22 -07:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
arch:Kconfig.locks Remove unused config option.
2011-04-10 17:01:05 +02:00
Kconfig.preempt
…
kexec.c
PM: Remove sysdev suspend, resume and shutdown operations
2011-05-11 21:37:15 +02:00
kfifo.c
kfifo: fix scatterlist usage
2010-10-01 10:50:58 -07:00
kmod.c
KEYS/DNS: Fix ____call_usermodehelper() to not lose the session keyring
2011-06-17 09:40:48 -07:00
kprobes.c
Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2011-01-07 17:02:58 -08:00
ksysfs.c
kernel/ksysfs.c: expose file_caps_enabled in sysfs
2011-04-19 16:45:51 -07:00
kthread.c
cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed
2011-05-28 17:02:57 +02:00
latencytop.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
lockdep_internals.h
…
lockdep_proc.c
lockdep: Remove unused 'factor' variable from lockdep_stats_show()
2011-03-23 13:54:47 +01:00
lockdep_states.h
…
lockdep.c
lockdep: Fix lock_is_held() on recursion
2011-06-07 12:25:50 +02:00
Makefile
cgroup: remove the ns_cgroup
2011-05-26 17:12:34 -07:00
module.c
Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6
2011-05-23 12:49:28 -07:00
mutex-debug.c
mutex: Use p->on_cpu for the adaptive spin
2011-04-14 08:52:33 +02:00
mutex-debug.h
mutex: Use p->on_cpu for the adaptive spin
2011-04-14 08:52:33 +02:00
mutex.c
lockdep, mutex: provide mutex_lock_nest_lock
2011-05-25 08:39:17 -07:00
mutex.h
mutex: Use p->on_cpu for the adaptive spin
2011-04-14 08:52:33 +02:00
notifier.c
…
nsproxy.c
cgroup: remove the ns_cgroup
2011-05-26 17:12:34 -07:00
padata.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
panic.c
move x86 specific oops=panic to generic code
2011-03-22 17:44:11 -07:00
params.c
params.c: Use new strtobool function to process boolean inputs
2011-05-19 16:55:28 +09:30
pid_namespace.c
pidns: call pid_ns_prepare_proc() from create_pid_namespace()
2011-03-23 19:46:58 -07:00
pid.c
next_pidmap: fix overflow condition
2011-04-18 10:35:30 -07:00
pm_qos_params.c
Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6
2011-05-29 11:18:09 -07:00
posix-cpu-timers.c
hrtimers: Avoid touching inactive timer bases
2011-05-23 13:59:54 +02:00
posix-timers.c
posix-timers: RCU conversion
2011-05-24 12:10:51 +02:00
printk.c
printk: allocate kernel log buffer earlier
2011-05-25 08:39:48 -07:00
profile.c
kernel/profile.c: remove some duplicate code from profile_hits()
2011-05-26 17:12:37 -07:00
ptrace.c
ptrace: ptrace_resume() shouldn't wake up !TASK_TRACED thread
2011-05-25 19:20:21 +02:00
range.c
kernel/range.c: fix clean_sort_range() for the case of full array
2010-11-12 07:55:31 -08:00
rcupdate.c
rcu: Use WARN_ON_ONCE for DEBUG_OBJECTS_RCU_HEAD warnings
2011-05-05 23:16:57 -07:00
rcutiny_plugin.h
rcu: Converge TINY_RCU expedited and normal boosting
2011-05-05 23:16:58 -07:00
rcutiny.c
sanitize <linux/prefetch.h> usage
2011-05-20 12:50:29 -07:00
rcutorture.c
rcu: mark rcutorture boosting callback as being on-stack
2011-05-05 23:16:57 -07:00
rcutree_plugin.h
rcu: Move RCU_BOOST #ifdefs to header file
2011-06-16 16:12:05 -07:00
rcutree_trace.c
rcu: use softirq instead of kthreads except when RCU_BOOST=y
2011-06-15 23:07:21 -07:00
rcutree.c
rcu: Move RCU_BOOST #ifdefs to header file
2011-06-16 16:12:05 -07:00
rcutree.h
rcu: Move RCU_BOOST #ifdefs to header file
2011-06-16 16:12:05 -07:00
relay.c
Clean up relay_alloc_page_array() slightly by using vzalloc rather than vmalloc and memset
2010-11-05 08:21:34 -07:00
res_counter.c
memcg: res_counter_read_u64(): fix potential races on 32-bit machines
2011-03-23 19:46:22 -07:00
resource.c
resources: add arch hook for preventing allocation in reserved areas
2010-12-17 10:01:09 -08:00
rtmutex_common.h
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex-debug.c
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex-debug.h
…
rtmutex-tester.c
rtmutex: tester: Remove the remaining BKL leftovers
2011-02-22 22:07:22 +01:00
rtmutex.c
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex.h
…
rwsem.c
…
sched_autogroup.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
sched_autogroup.h
sched, autogroup: Stop going ahead if autogroup is disabled
2011-02-23 11:33:59 +01:00
sched_clock.c
sched: Add some clock info to sched_debug
2010-11-23 10:29:08 +01:00
sched_cpupri.c
sched: No need for bootmem special cases
2010-07-17 12:06:22 +02:00
sched_cpupri.h
sched: No need for bootmem special cases
2010-07-17 12:06:22 +02:00
sched_debug.c
sched: Get rid of lock_depth
2011-04-24 13:18:38 +02:00
sched_fair.c
sched: Remove rcu_read_lock() from wake_affine()
2011-07-01 10:39:06 +02:00
sched_features.h
sched: Move the second half of ttwu() to the remote cpu
2011-04-14 08:52:41 +02:00
sched_idletask.c
sched: Drop the rq argument to sched_class::select_task_rq()
2011-04-14 08:52:36 +02:00
sched_rt.c
Merge commit 'v3.0-rc5' into sched/core
2011-07-01 10:34:24 +02:00
sched_stats.h
sched: More sched_domain iterations fixes
2011-05-28 17:02:54 +02:00
sched_stoptask.c
sched: Drop the rq argument to sched_class::select_task_rq()
2011-04-14 08:52:36 +02:00
sched.c
sched: Simplify mutex_spin_on_owner()
2011-07-01 10:39:07 +02:00
seccomp.c
…
semaphore.c
…
signal.c
signal.c: fix kernel-doc notation
2011-06-14 19:12:17 -07:00
smp.c
generic-ipi: Fix kexec boot crash by initializing call_single_queue before enabling interrupts
2011-06-17 10:17:12 +02:00
softirq.c
rcu: Use softirq to address performance regression
2011-06-14 15:25:39 -07:00
spinlock.c
…
srcu.c
rcu: demote SRCU_SYNCHRONIZE_DELAY from kernel-parameter status
2011-01-14 04:56:49 -08:00
stacktrace.c
…
stop_machine.c
kthread: use kthread_create_on_node()
2011-03-22 17:44:01 -07:00
sys_ni.c
ipc: Add missing sys_ni entries for ipc/compat.c functions
2011-05-20 13:53:02 -07:00
sys.c
Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
2011-05-19 18:24:11 -07:00
sysctl_binary.c
open-style analog of vfs_path_lookup()
2011-03-14 09:15:28 -04:00
sysctl_check.c
sysctl_check: drop dead code
2011-03-23 19:46:51 -07:00
sysctl.c
perf: Comment /proc/sys/kernel/perf_event_paranoid to be part of user ABI
2011-06-04 12:22:04 +02:00
taskstats.c
taskstats: don't allow duplicate entries in listener mode
2011-06-27 18:00:13 -07:00
test_kprobes.c
kprobes: Fix selftest to clear flags field for reusing probes
2010-10-14 08:55:27 +02:00
time.c
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-15 18:53:35 -07:00
timeconst.pl
…
timer.c
timers: Consider slack value in mod_timer()
2011-06-03 15:02:32 +02:00
tracepoint.c
jump label: Introduce static_branch() interface
2011-04-04 12:48:08 -04:00
tsacct.c
taskstats: use real microsecond granularity for CPU times
2010-10-27 18:03:17 -07:00
uid16.c
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
up.c
…
user_namespace.c
user_ns: improve the user_ns on-the-slab packaging
2011-01-13 08:03:18 -08:00
user-return-notifier.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
user.c
userns: add a user_namespace as creator/owner of uts_namespace
2011-03-23 19:46:59 -07:00
utsname_sysctl.c
…
utsname.c
ns proc: Add support for the uts namespace
2011-05-10 14:35:35 -07:00
wait.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
watchdog.c
kernel/watchdog.c: Use proper ANSI C prototypes
2011-05-23 21:07:40 -07:00
workqueue_sched.h
workqueue: implement concurrency managed dynamic worker pool
2010-06-29 10:07:14 +02:00
workqueue.c
Merge branch 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2011-05-24 11:53:42 -07:00