Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Thomas Gleixner 83e96c604e futex: Remove warn on in return fixup path ... The WARN_ON() in the fixup return path of futex_lock_pi() can trigger with false positives. The following scenario happens: t1 holds the futex and t2 and t3 are blocked on the kernel side rt_mutex. t1 releases the futex (and the rt_mutex) and assigned t2 to be the next owner of the futex. t2 is interrupted and returns w/o acquiring the rt_mutex, before t1 can release the rtmutex. t1 releases the rtmutex and t3 becomes the pending owner of the rtmutex. t2 notices that it is the designated owner (user space variable) and fails to acquire the rt_mutex via trylock, because it is not allowed to steal the rt_mutex from t3. Now it looks at the rt_mutex pending owner (t3) and assigns the futex and the pi_state to it. During the fixup t4 steals the rtmutex from t3. t2 returns from the fixup and the owner of the rt_mutex has changed from t3 to t4. There is no need to do another round of fixups from t2. The important part (t2 is not returning as the user space visible owner) is done. The further fixups are done, before either t3 or t4 return to user space. For the user space it is not relevant which task (t3 or t4) is the real owner, as long as those are both in the kernel, which is guaranteed by the serialization of the hash bucket lock. Both tasks (which ever returns first to userspace - t4 because it locked the rt_mutex or t3 due to a signal) are going through the lock_futex_pi() return path where the ownership is fixed before the return to user space. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2008-02-01 17:45:14 +01:00
..
irq	genirq: stackdump after the "Trying to free already-free IRQ" message	2008-01-30 13:33:24 +01:00
power	Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc	2008-02-01 11:45:47 +11:00
time	tick-sched: add more debug information	2008-02-01 17:45:14 +01:00
.gitignore
acct.c	acct: real_parent ppid	2008-01-07 14:55:37 -08:00
audit.c	[AUDIT]: Increase skb->truesize in audit_expand	2008-01-31 19:27:08 -08:00
audit.h	[PATCH] audit: watching subtrees	2007-10-21 02:37:45 -04:00
audit_tree.c	[PATCH] audit: watching subtrees	2007-10-21 02:37:45 -04:00
auditfilter.c	[PATCH] audit: watching subtrees	2007-10-21 02:37:45 -04:00
auditsc.c	auditsc: fix kernel-doc param warnings	2007-10-22 19:40:02 -07:00
backtracetest.c	x86: add a simple backtrace test module	2008-01-30 13:33:08 +01:00
capability.c	Uninline find_pid etc set of functions	2007-10-19 11:53:41 -07:00
cgroup.c	Improve cgroup printks	2007-11-14 18:45:37 -08:00
cgroup_debug.c	Task Control Groups: simple task cgroup debug info subsystem	2007-10-19 11:53:36 -07:00
compat.c	Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt	2007-10-18 15:12:41 -07:00
configs.c
cpu.c	cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()	2008-01-25 21:08:02 +01:00
cpuset.c	cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()	2008-01-25 21:08:02 +01:00
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	exit: Use task_is_*	2007-12-06 17:35:17 -05:00
extable.c	module: Don't report discarded init pages as kernel text.	2008-01-29 17:13:18 +11:00
fork.c	KVM: Disallow fork() and similar games when using a VM	2008-01-30 17:53:13 +02:00
futex.c	futex: Remove warn on in return fixup path	2008-02-01 17:45:14 +01:00
futex_compat.c	[FUTEX] Fix address computation in compat code.	2007-11-09 16:13:08 -08:00
hrtimer.c	hrtimer: fix hrtimer_init_sleeper() users	2008-02-01 17:45:13 +01:00
itimer.c	whitespace fixes: interval timers	2007-10-18 14:37:26 -07:00
kallsyms.c	module: make module_address_lookup safe	2008-01-29 17:13:23 +11:00
Kconfig.hz	sched: high-res preemption tick	2008-01-25 21:08:29 +01:00
Kconfig.instrumentation	Tiny clean-up of OPROFILE/KPROBES configuration	2007-12-06 09:41:12 -08:00
Kconfig.preempt	sched: remove the !PREEMPT_BKL code	2008-01-25 21:08:33 +01:00
kexec.c	vmcoreinfo: add the array length of "free_list" for filtering free pages	2008-01-08 16:10:36 -08:00
kfifo.c
kmod.c	Fix unbalanced helper_lock in kernel/kmod.c	2008-01-17 15:38:59 -08:00
kprobes.c	x86: kprobes: add kprobes smoke tests that run on boot	2008-01-30 13:32:53 +01:00
ksysfs.c	Kobject: convert remaining kobject_unregister() to kobject_put()	2008-01-24 20:40:40 -08:00
kthread.c	sched: fix, always create kernel threads with normal priority	2008-01-25 21:08:33 +01:00
latency.c
latencytop.c	sched: latencytop support	2008-01-25 21:08:34 +01:00
lockdep.c	softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks	2008-01-25 21:08:02 +01:00
lockdep_internals.h
lockdep_proc.c
Makefile	x86: add a simple backtrace test module	2008-01-30 13:33:08 +01:00
marker.c	Linux Kernel Markers: fix marker mutex not taken upon module load	2007-11-14 18:45:40 -08:00
module.c	x86/non-x86: percpu, node ids, apic ids x86.git fixup	2008-01-30 13:33:32 +01:00
mutex-debug.c
mutex-debug.h
mutex.c	Add mutex_lock_killable	2007-12-06 17:37:59 -05:00
mutex.h
notifier.c	Add kernel/notifier.c	2007-10-19 11:53:34 -07:00
ns_cgroup.c	cgroups: implement namespace tracking subsystem	2007-10-19 11:53:37 -07:00
nsproxy.c	pid namespaces: allow cloning of new namespace	2007-10-19 11:53:39 -07:00
panic.c	debug: add the end-of-trace marker and the module list to	2008-01-30 13:32:50 +01:00
params.c	module: fix the module name length in param_sysfs_builtin	2008-01-29 17:13:24 +11:00
pid.c	pidns: Place under CONFIG_EXPERIMENTAL	2007-11-14 18:45:43 -08:00
posix-cpu-timers.c	sched: rt-watchdog: fix .rlim_max = RLIM_INFINITY	2008-01-25 21:08:32 +01:00
posix-timers.c	Isolate some explicit usage of task->tgid	2007-10-19 11:53:40 -07:00
printk.c	debug: turn ignore_loglevel into an early param	2008-01-31 22:45:23 +01:00
profile.c	debug: clean up kernel/profile.c	2008-01-25 21:08:33 +01:00
ptrace.c	Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc	2008-02-01 11:45:47 +11:00
rcuclassic.c	Preempt-RCU: implementation	2008-01-25 21:08:24 +01:00
rcupdate.c	Preempt-RCU: fix rcu_barrier for preemptive environment.	2008-01-25 21:08:24 +01:00
rcupreempt.c	Preempt-RCU: CPU Hotplug handling	2008-01-25 21:08:25 +01:00
rcupreempt_trace.c	Preempt-RCU: implementation	2008-01-25 21:08:24 +01:00
rcutorture.c	cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()	2008-01-25 21:08:02 +01:00
relay.c	whitespace fixes: relayfs	2007-10-18 14:37:24 -07:00
resource.c	Add IORESOUCE_BUSY flag for System RAM	2007-11-14 18:45:39 -08:00
rtmutex-debug.c	Use helpers to obtain task pid in printks	2007-10-19 11:53:43 -07:00
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	Use helpers to obtain task pid in printks	2007-10-19 11:53:43 -07:00
rtmutex.h
rtmutex_common.h
rwsem.c	sched: mark rwsem functions as __sched for wchan/profiling	2007-12-18 15:21:13 +01:00
sched.c	Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc	2008-02-01 11:45:47 +11:00
sched_debug.c	sched: keep total / count stats in addition to the max for	2008-01-25 21:08:35 +01:00
sched_fair.c	sched: let +nice tasks have smaller impact	2008-01-31 22:45:22 +01:00
sched_idletask.c	sched: high-res preemption tick	2008-01-25 21:08:29 +01:00
sched_rt.c	sched: fix goto retry in pick_next_task_rt()	2008-01-25 21:08:34 +01:00
sched_stats.h	sched: clean up kernel/sched_stat.h	2007-11-28 15:52:56 +01:00
seccomp.c
signal.c	Ensure that we export __fatal_signal_pending()	2008-02-01 12:58:14 +11:00
softirq.c	time: track accurate idle time with tick_sched.idle_sleeptime	2008-01-30 13:30:04 +01:00
softlockup.c	softlockup: fix signedness	2008-01-25 21:08:34 +01:00
spinlock.c	spinlock: lockbreak cleanup	2008-01-30 13:31:20 +01:00
srcu.c
stacktrace.c
stop_machine.c	cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()	2008-01-25 21:08:02 +01:00
sys.c	x86: ignore the sys_getcpu() tcache parameter	2007-11-17 16:27:00 +01:00
sys_ni.c	[POWERPC] Provide a way to protect 4k subpages when using 64k pages	2008-01-24 10:06:01 +11:00
sysctl.c	x86: various changes and cleanups to in_p/out_p delay details	2008-01-30 13:30:05 +01:00
sysctl_check.c	sysctl: Infrastructure for per namespace sysctls	2008-01-28 14:55:17 -08:00
taskstats.c	kernel/taskstats.c: fix bogus nlmsg_free()	2007-11-14 18:45:44 -08:00
test_kprobes.c	x86: kprobes: add kprobes smoke tests that run on boot	2008-01-30 13:32:53 +01:00
time.c	timekeeping: update xtime_cache when time(zone) changes	2008-02-01 17:45:13 +01:00
timer.c	Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc	2008-02-01 11:45:47 +11:00
tsacct.c	Add scaled time to taskstats based process accounting	2007-10-18 14:37:28 -07:00
uid16.c
user.c	uids: merge multiple error paths in alloc_uid() into one	2008-01-25 21:08:26 +01:00
user_namespace.c
utsname.c
utsname_sysctl.c	Isolate the UTS namespace's domainname and hostname back	2007-11-29 09:24:53 -08:00
wait.c	wait: Use TASK_NORMAL	2007-12-06 17:34:36 -05:00
workqueue.c	cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()	2008-01-25 21:08:02 +01:00