mirror/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Files
f1a11e0576c7a73d759d05d776692b2b2d37172b
linux/kernel
History
Thomas Gleixner f1a11e0576 futex: remove the wait queue 
The waitqueue which is used in struct futex_q is a leftover from the
futexfd implementation. There is no need to use a waitqueue at all, as
the waiting task is the only user of it. The waitqueue just adds
additional locking and a loop in the wake up path which both can be
avoided.

We have already a task reference in struct futex_q which is used for
PI futexes. Use it for normal futexes as well and just wake up the
task directly.

The logic of signalling the futex wakeup via setting q->lock_ptr to
NULL is kept with the difference that we set it NULL before doing the
wakeup. This opens an exit race window vs. a non futex wake up of the
to be woken up task, which we prevent with get_task_struct /
put_task_struct on the waiter.

[ Impact: simplification ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2009-05-15 15:24:18 +02:00
..
irq
PM: Introduce functions for suspending and resuming device interrupts
2009-03-30 21:46:54 +02:00
power
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2009-04-03 15:24:35 -07:00
time
Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-26 16:05:42 -07:00
trace
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2009-04-03 15:24:35 -07:00
.gitignore
…
acct.c
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
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
audit: validate comparison operations, store them in sane form
2009-01-04 15:14:42 -05:00
audit.c
[PATCH] fix broken timestamps in AVC generated by kernel threads
2008-12-09 02:27:41 -05:00
audit.h
fixing audit rule ordering mess, part 1
2009-01-04 15:14:41 -05:00
auditfilter.c
audit: validate comparison operations, store them in sane form
2009-01-04 15:14:42 -05:00
auditsc.c
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
backtracetest.c
…
bounds.c
…
capability.c
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
cgroup_debug.c
debug cgroup: remove unneeded cgroup_lock
2009-04-02 19:04:54 -07:00
cgroup_freezer.c
freezer_cg: disable writing freezer.state of root cgroup
2008-11-12 17:17:16 -08:00
cgroup.c
memcg: fix OOM killer under memcg
2009-04-02 19:04:55 -07:00
compat.c
Allow times and time system calls to return small negative values
2009-01-06 15:59:13 -08:00
configs.c
kernel/configs.c: remove useless comments
2008-10-20 08:52:34 -07:00
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: Inaugurate COW credentials
2008-11-14 10:39:23 +11:00
cred.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
2009-01-09 13:59:25 -08:00
delayacct.c
schedstat: consolidate per-task cpu runtime stats
2008-12-18 13:54:01 +01:00
dma-coherent.c
dma-coherent: Restore dma_alloc_from_coherent() large alloc fall back policy.
2009-01-21 18:51:53 +09:00
dma.c
kernel/dma.c: remove a CVS keyword
2008-10-16 11:21:30 -07:00
exec_domain.c
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
exit.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-04-02 21:09:10 -07:00
extable.c
symbols, stacktrace: look up init symbols after module symbols
2009-03-19 13:38:35 +01:00
fork.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-04-02 21:09:10 -07:00
freezer.c
freezer_cg: use thaw_process() in unfreeze_cgroup()
2008-10-30 11:38:45 -07:00
futex_compat.c
CRED: Use RCU to access another task's creds and to release a task's own creds
2008-11-14 10:39:19 +11:00
futex.c
futex: remove the wait queue
2009-05-15 15:24:18 +02:00
hrtimer.c
hrtimer: prevent negative expiry value after clock_was_set()
2009-01-30 22:35:34 +01:00
itimer.c
timers: split process wide cpu clocks/timers
2009-02-05 13:04:33 +01:00
kallsyms.c
Revert "kbuild: strip generated symbols from *.ko"
2009-01-14 21:38:20 +01:00
Kconfig.freezer
container freezer: implement freezer cgroup subsystem
2008-10-20 08:52:34 -07:00
Kconfig.hz
sched: fix SCHED_HRTICK dependency
2008-07-28 14:37:38 +02:00
Kconfig.preempt
rcu: provide RCU options on non-preempt architectures too
2008-12-25 09:31:28 +01:00
kexec.c
kexec: vmcoreinfo_data[] can become static
2009-04-02 19:05:04 -07:00
kfifo.c
…
kgdb.c
kgdb: call touch_softlockup_watchdog on resume
2008-10-06 13:50:59 -05:00
kmod.c
cpumask: remove dangerous CPU_MASK_ALL_PTR, &CPU_MASK_ALL
2009-03-30 22:05:11 +10:30
kprobes.c
kprobes: check CONFIG_FREEZER instead of CONFIG_PM
2009-01-16 14:32:17 -05:00
ksysfs.c
kernel/ksysfs.c:fix dependence on CONFIG_NET
2009-01-06 10:44:31 -08:00
kthread.c
cpumask: remove dangerous CPU_MASK_ALL_PTR, &CPU_MASK_ALL
2009-03-30 22:05:11 +10:30
latencytop.c
sched, latencytop: incorporate review feedback from Andrew Morton
2009-02-11 10:18:04 +01:00
lockdep_internals.h
lockdep: get_user_chars() redo
2009-02-14 23:28:22 +01:00
lockdep_proc.c
lockstat: warn about disabled lock debugging
2009-02-14 23:28:28 +01:00
lockdep_states.h
lockdep: move state bit definitions around
2009-02-14 23:27:59 +01:00
lockdep.c
Merge branch 'linus' into locking-for-linus
2009-03-31 13:53:43 +02:00
Makefile
Create a dynamically sized pool of threads for doing very slow work items
2009-04-03 16:42:35 +01:00
marker.c
markers/tracpoints: fix non-modular build
2008-11-16 09:52:03 +01:00
module.c
Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
2009-03-27 17:28:43 +01:00
mutex-debug.c
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
mutex-debug.h
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
mutex.c
mutex: adaptive spinnning, performance tweaks
2009-01-14 19:03:54 +01:00
mutex.h
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
notifier.c
Merge commit 'v2.6.28-rc6' into core/debug
2008-11-26 08:22:50 +01:00
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
User namespaces: set of cleanups (v2)
2008-11-24 18:57:41 -05:00
panic.c
panic: clean up kernel/panic.c
2009-03-13 11:25:53 +01:00
params.c
Fix compile warning in kernel/params.c
2008-10-23 12:09:00 -07:00
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
pm_qos_requirement might sleep
2008-09-02 19:21:40 -07:00
posix-cpu-timers.c
posix timers: fix RLIMIT_CPU && fork()
2009-03-23 20:43:35 +01:00
posix-timers.c
[CVE-2009-0029] System call wrappers part 05
2009-01-14 14:15:20 +01:00
printk.c
kexec: add dmesg log symbols to /proc/vmcoreinfo lists
2009-04-02 19:05:04 -07:00
profile.c
profiling: fix broken profiling regression
2009-02-10 00:50:37 +01:00
ptrace.c
Merge branch 'core-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-03 17:35:06 -07:00
rcuclassic.c
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcupdate.c
rcu: rcu_barrier VS cpu_hotplug: Ensure callbacks in dead cpu are migrated to online cpu
2009-03-31 00:09:37 +02:00
rcupreempt_trace.c
"Tree RCU": scalable classic RCU implementation
2008-12-18 21:56:04 +01:00
rcupreempt.c
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcutorture.c
cpumask: convert rcutorture.c
2009-03-30 22:05:16 +10:30
rcutree_trace.c
"Tree RCU": scalable classic RCU implementation
2008-12-18 21:56:04 +01:00
rcutree.c
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
relay.c
relay: fix for possible loss/corruption of produced subbufs
2009-04-02 19:05:05 -07:00
res_counter.c
memcg: memory cgroup resource counters for hierarchy
2009-01-08 08:31:05 -08:00
resource.c
resources: fix parameter name and kernel-doc
2009-01-15 16:39:38 -08:00
rtmutex_common.h
rt_mutex: add proxy lock routines
2009-04-06 11:14:02 +02:00
rtmutex-debug.c
…
rtmutex-debug.h
…
rtmutex-tester.c
sysdev: Pass the attribute to the low level sysdev show/store function
2008-07-21 21:55:02 -07:00
rtmutex.c
rt_mutex: add proxy lock routines
2009-04-06 11:14:02 +02:00
rtmutex.h
…
rwsem.c
…
sched_clock.c
sched_clock: cleanups
2009-02-26 21:56:07 +01:00
sched_cpupri.c
sched: fix section mismatch
2009-01-06 11:07:15 +01:00
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
Merge branch 'sched/urgent'; commit 'v2.6.29-rc5' into sched/core
2009-02-15 21:15:16 +01:00
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: add CONFIG_SMP consistency
2008-10-22 10:01:52 +02:00
sched_rt.c
Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
2009-03-27 17:28:43 +01:00
sched_stats.h
sched: remove unused fields from struct rq
2009-03-24 23:16:51 +01:00
sched.c
Merge branch 'ipi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-03 17:33:30 -07:00
seccomp.c
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
semaphore.c
semaphore: __down_common: use signal_pending_state()
2008-08-05 14:33:47 -07:00
signal.c
signals: SI_USER: Masquerade si_pid when crossing pid ns boundary
2009-04-02 19:04:58 -07:00
slow-work.c
Document the slow work thread pool
2009-04-03 16:42:35 +01:00
smp.c
generic-ipi: eliminate WARN_ON()s during oops/panic
2009-03-13 10:47:34 +01:00
softirq.c
Merge branch 'ipi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-03 17:33:30 -07:00
softlockup.c
softlock: fix false panic which can occur if softlockup_thresh is reduced
2009-01-14 11:48:07 +01:00
spinlock.c
Allow rwlocks to re-enable interrupts
2009-04-02 19:05:11 -07:00
srcu.c
…
stacktrace.c
stacktrace: provide save_stack_trace_tsk() weak alias
2008-12-25 11:44:43 +01:00
stop_machine.c
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sys_ni.c
[CVE-2009-0029] Make sys_syslog a conditional system call
2009-01-14 14:15:16 +01:00
sys.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-04-02 21:09:10 -07:00
sysctl_check.c
net: add ARP notify option for devices
2009-02-01 01:04:33 -08:00
sysctl.c
Make the slow work pool configurable
2009-04-03 16:42:35 +01:00
taskstats.c
cpumask: convert rest of files in kernel/
2009-01-01 10:12:28 +10:30
test_kprobes.c
kprobes: add tests for register_kprobes
2009-01-06 15:59:20 -08:00
time.c
[CVE-2009-0029] System call wrappers part 01
2009-01-14 14:15:18 +01:00
timeconst.pl
…
timer.c
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
tracepoint.c
markers/tracpoints: fix non-modular build
2008-11-16 09:52:03 +01:00
tsacct.c
Fix fixpoint divide exception in acct_update_integrals
2009-03-09 08:13:35 -07:00
uid16.c
[CVE-2009-0029] System call wrappers part 19
2009-01-14 14:15:26 +01:00
up.c
smp_call_function_single(): be slightly less stupid, fix #2
2009-01-12 16:04:37 +01:00
user_namespace.c
Fix recursive lock in free_uid()/free_user_ns()
2009-02-27 16:26:21 -08:00
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
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
wait.c
wait: prevent exclusive waiter starvation
2009-02-05 12:56:48 -08:00
workqueue.c
workqueue: avoid recursion in run_workqueue()
2009-04-02 19:05:00 -07:00