Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Thomas Gleixner 7b7422a566 clocksource: Prevent potential kgdb dead lock ... commit 0f8e8ef7 (clocksource: Simplify clocksource watchdog resume logic) introduced a potential kgdb dead lock. When the kernel is stopped by kgdb inside code which holds watchdog_lock then kgdb dead locks in clocksource_resume_watchdog(). clocksource_resume_watchdog() is called from kbdg via clocksource_touch_watchdog() to avoid that the clock source watchdog marks TSC unstable after the kernel has been stopped. Solve this by replacing spin_lock with a spin_trylock and just return in case the lock is held. Not resetting the watchdog might result in TSC becoming marked unstable, but that's an acceptable penalty for using kgdb. The timekeeping is anyway easily screwed up by kgdb when the system uses either jiffies or a clock source which wraps in short intervals (e.g. pm_timer wraps about every 4.6s), so we really do not have to worry about that occasional TSC marked unstable side effect. The second caller of clocksource_resume_watchdog() is clocksource_resume(). The trylock is safe here as well because the system is UP at this point, interrupts are disabled and nothing else can hold watchdog_lock(). Reported-by: Jason Wessel <jason.wessel@windriver.com> LKML-Reference: <1264480000-6997-4-git-send-email-jason.wessel@windriver.com> Cc: kgdb-bugreport@lists.sourceforge.net Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: John Stultz <johnstul@us.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2010-01-26 14:53:16 +01:00
..
gcov	microblaze: Enable GCOV_PROFILE_ALL	2009-09-21 14:29:21 +02:00
irq	genirq: Convert irq_desc.lock to raw_spinlock	2009-12-14 23:55:33 +01:00
power	vt: introduce and use vt_kmsg_redirect() function	2009-12-15 08:53:28 -08:00
time	clocksource: Prevent potential kgdb dead lock	2010-01-26 14:53:16 +01:00
trace	tracing/filters: Add comment for match callbacks	2010-01-14 22:38:14 -05:00
.gitignore
acct.c	bsdacct: fix uid/gid misreporting	2009-12-15 08:53:10 -08:00
async.c
audit.c	Audit: send signal info if selinux is disabled	2009-09-24 03:50:26 -04:00
audit.h
audit_tree.c	fix more leaks in audit_tree.c tag_chunk()	2009-12-19 09:27:43 -08:00
audit_watch.c	Audit: reorganize struct audit_watch to save 8 bytes	2009-09-24 03:50:25 -04:00
auditfilter.c
auditsc.c	Sanitize f_flags helpers	2009-12-22 12:27:34 -05:00
backtracetest.c
bounds.c	kbuild: move bounds.h to include/generated	2009-12-12 13:08:14 +01:00
capability.c	remove CONFIG_SECURITY_FILE_CAPABILITIES compile option	2009-11-24 15:06:47 +11:00
cgroup.c	cgroups: fix 2.6.32 regression causing BUG_ON() in cgroup_diput()	2010-01-11 09:34:05 -08:00
cgroup_freezer.c	cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time	2009-09-24 07:20:58 -07:00
compat.c
configs.c
cpu.c	sched: Fix set_cpu_active() in cpu_down()	2009-12-16 19:01:53 +01:00
cpuset.c	sched: Fix balance vs hotplug race	2009-12-06 21:10:56 +01:00
cred-internals.h
cred.c	creds_are_invalid() needs to be exported for use by modules:	2009-09-23 11:02:26 -07:00
delayacct.c	headers: taskstats_kern.h trim	2009-09-18 09:48:52 -07:00
dma.c
exec_domain.c
exit.c	do_wait() optimization: do not place sub-threads on task_struct->children list	2009-12-17 15:45:31 -08:00
extable.c
fork.c	do_wait() optimization: do not place sub-threads on task_struct->children list	2009-12-17 15:45:31 -08:00
freezer.c
futex.c	futexes: Remove rw parameter from get_futex_key()	2010-01-13 09:17:36 +01:00
futex_compat.c
groups.c
hrtimer.c	hrtimers: Convert to raw_spinlocks	2009-12-14 23:55:34 +01:00
hung_task.c	softlockup: Fix hung_task_check_count sysctl	2009-11-27 06:21:57 +01:00
hw_breakpoint.c	Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-12-31 11:52:01 -08:00
itimer.c	itimers: Fix racy writes to cpu_itimer fields	2009-11-18 16:32:12 +01:00
kallsyms.c	hw-breakpoints: Fix broken hw-breakpoint sample module	2009-11-10 11:23:29 +01:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks	mutex: Better control mutex adaptive spinning config	2009-12-03 11:50:11 +01:00
Kconfig.preempt
kexec.c	Merge git://git.infradead.org/~dwmw2/mtd-2.6.33	2010-01-24 10:31:34 -08:00
kfifo.c	kfifo: document everywhere that size has to be power of two	2010-01-16 12:15:38 -08:00
kgdb.c	kgdb: Always process the whole breakpoint list on activate or deactivate	2009-12-11 08:43:20 -06:00
kmod.c	kmod: fix resource leak in call_usermodehelper_pipe()	2010-01-11 09:34:04 -08:00
kprobes.c	kprobes: Fix distinct type warning	2009-12-28 10:25:31 +01:00
ksysfs.c	kexec: premit reduction of the reserved memory size	2009-12-16 07:20:13 -08:00
kthread.c	sched: Move kthread_bind() back to kthread.c	2009-12-16 19:01:57 +01:00
latencytop.c
lockdep.c	locking: Convert __raw_spin* functions to arch_spin*	2009-12-14 23:55:32 +01:00
lockdep_internals.h
lockdep_proc.c	seq_file: constify seq_operations	2009-09-23 07:39:29 -07:00
lockdep_states.h
Makefile	Merge branch 'kvm-updates/2.6.33' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2009-12-08 08:02:38 -08:00
module.c	modules: Skip empty sections when exporting section notes	2010-01-06 01:11:29 -08:00
mutex-debug.c	headers: remove sched.h from interrupt.h	2009-10-11 11:20:58 -07:00
mutex-debug.h	locking: Implement new raw_spinlock	2009-12-14 23:55:32 +01:00
mutex.c	mutex: Better control mutex adaptive spinning config	2009-12-03 11:50:11 +01:00
mutex.h
notifier.c	kprobes: Fix to add __kprobes to notify_die	2009-08-30 03:08:26 +02:00
ns_cgroup.c	cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time	2009-09-24 07:20:58 -07:00
nsproxy.c
panic.c	kmsg_dump: Dump on crash_kexec as well	2009-12-31 19:45:04 +00:00
params.c	tree-wide: convert open calls to remove spaces to skip_spaces() lib function	2009-12-15 08:53:32 -08:00
perf_event.c	perf: Honour event state for aux stream data	2010-01-21 13:40:40 +01:00
pid.c	pid: reduce code size by using a pointer to iterate over array	2009-12-16 07:20:12 -08:00
pid_namespace.c	pidns: deny CLONE_PARENT|CLONE_NEWPID combination	2009-09-24 07:21:04 -07:00
pm_qos_params.c	pm_qos: clean up racy global "name" variable	2009-10-14 15:31:10 +02:00
posix-cpu-timers.c	posix-cpu-timers: optimize and document timer_create callback	2009-11-18 12:36:05 +01:00
posix-timers.c	time: Introduce CLOCK_REALTIME_COARSE	2009-08-21 21:43:46 +02:00
printk.c	Merge git://git.infradead.org/~dwmw2/mtd-2.6.33	2010-01-24 10:31:34 -08:00
profile.c	kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_file	2009-09-20 20:15:40 +02:00
ptrace.c	ptrace: __ptrace_detach: do __wake_up_parent() if we reap the tracee	2009-09-24 07:20:59 -07:00
rcupdate.c	rcu: Re-arrange code to reduce #ifdef pain	2009-11-22 18:58:16 +01:00
rcutiny.c	rcu: Eliminate unneeded function wrapping	2009-11-22 18:58:16 +01:00
rcutorture.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2009-12-14 09:58:24 -08:00
rcutree.c	rcu: Add expedited grace-period support for preemptible RCU	2009-12-03 11:35:25 +01:00
rcutree.h	rcu: Add expedited grace-period support for preemptible RCU	2009-12-03 11:35:25 +01:00
rcutree_plugin.h	rcu: Add expedited grace-period support for preemptible RCU	2009-12-03 11:35:25 +01:00
rcutree_trace.c	rcu: Add expedited grace-period support for preemptible RCU	2009-12-03 11:35:25 +01:00
relay.c	const: constify remaining pipe_buf_operations	2009-12-16 07:20:05 -08:00
res_counter.c	memcg: some modification to softlimit under hierarchical memory reclaim.	2009-10-01 16:11:13 -07:00
resource.c	resources: fix call to alignf() in allocate_resource()	2009-12-21 10:42:29 -08:00
rtmutex-debug.c	sched: Convert pi_lock to raw_spinlock	2009-12-14 23:55:33 +01:00
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c	rtmutes: Convert rtmutex.lock to raw_spinlock	2009-12-14 23:55:33 +01:00
rtmutex.h
rtmutex_common.h
rwsem.c
sched.c	sched: Reassign prev and switch_count when reacquire_kernel_lock() fail	2010-01-21 13:39:04 +01:00
sched_clock.c	sched: Fix cpu_clock() in NMIs, on !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK	2009-12-15 09:04:36 +01:00
sched_cpupri.c	sched: Convert cpupri lock to raw_spinlock	2009-12-14 23:55:33 +01:00
sched_cpupri.h	sched: Convert cpupri lock to raw_spinlock	2009-12-14 23:55:33 +01:00
sched_debug.c	sched: Convert rq->lock to raw_spinlock	2009-12-14 23:55:33 +01:00
sched_fair.c	sched: Fix vmark regression on big machines	2010-01-21 13:39:03 +01:00
sched_features.h	sched: Discard some old bits	2009-12-09 10:03:07 +01:00
sched_idletask.c	sched: Restore printk sanity	2009-12-20 19:05:02 +01:00
sched_rt.c	sched: Add pre and post wakeup hooks	2009-12-16 19:01:58 +01:00
sched_stats.h
seccomp.c
semaphore.c
signal.c	kernel/signal.c: fix kernel information leak with print-fatal-signals=1	2010-01-11 09:34:05 -08:00
slow-work-debugfs.c	SLOW_WORK: Move slow_work's proc file to debugfs	2009-12-01 08:20:31 -08:00
slow-work.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6	2009-12-08 07:38:50 -08:00
slow-work.h	SLOW_WORK: Move slow_work's proc file to debugfs	2009-12-01 08:20:31 -08:00
smp.c	smp_call_function_any(): pass the node value to cpumask_of_node()	2010-01-16 12:15:39 -08:00
softirq.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2009-12-14 09:58:24 -08:00
softlockup.c	percpu: make percpu symbols under kernel/ and mm/ unique	2009-10-29 22:34:13 +09:00
spinlock.c	locking: Cleanup the name space completely	2009-12-14 23:55:33 +01:00
srcu.c	rcu: Add synchronize_srcu_expedited()	2009-10-26 09:40:30 +01:00
stacktrace.c
stop_machine.c
sys.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-12-19 09:47:34 -08:00
sys_ni.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2009-12-08 07:55:01 -08:00
sysctl.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6	2009-12-17 16:58:26 -08:00
sysctl_binary.c	SYSCTL: Print binary sysctl warnings (nearly) only once	2009-12-23 21:00:20 +01:00
sysctl_check.c	ipv4 05/05: add sysctl to accept packets with local source addresses	2009-12-03 12:14:38 -08:00
taskstats.c
test_kprobes.c
time.c	Revert "time: Remove xtime_cache"	2009-12-22 14:10:37 -08:00
timeconst.pl
timer.c	perf: Fix perf_event_do_pending() fallback callsite	2010-01-21 13:40:39 +01:00
tracepoint.c	trivial: fix typo "to to" in multiple files	2009-09-21 15:14:55 +02:00
tsacct.c
uid16.c	headers: utsname.h redux	2009-09-23 18:13:10 -07:00
up.c
user-return-notifier.c	core: Clean up user return notifers use of per_cpu	2009-12-02 10:22:59 +01:00
user.c	uids: Prevent tear down race	2009-11-02 16:02:39 +01:00
user_namespace.c
utsname.c
utsname_sysctl.c	sysctl kernel: Remove binary sysctl logic	2009-11-12 02:04:55 -08:00
wait.c
workqueue.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2009-12-10 09:35:44 -08:00