Oleg Nesterov 4ecdafc808 kthread: introduce to_live_kthread() ...

"k->vfork_done != NULL" with a barrier() after to_kthread(k) in
task_get_live_kthread(k) looks unclear, and sub-optimal because we load
->vfork_done twice.

All we need is to ensure that we do not return to_kthread(NULL).  Add a
new trivial helper which loads/checks ->vfork_done once, this also looks
more understandable.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2013-04-29 15:54:25 -07:00

..

debug

Merge tag 'for_linux-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb

2013-03-02 08:31:39 -08:00

events

events: Protect access via task_subsys_state_check()

2013-04-21 11:21:39 +02:00

gcov

kernel/gcov: remove depends on CONFIG_EXPERIMENTAL

2013-01-11 11:39:33 -08:00

irq

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

power

Merge tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2013-02-21 12:05:51 -08:00

sched

Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-04-29 08:21:37 -07:00

time

clockevents: Don't allow dummy broadcast timers

2013-03-07 17:16:11 +01:00

trace

Revert "block: add missing block_bio_complete() tracepoint"

2013-04-18 09:00:26 -07:00

.gitignore

kernel/hz.bc: ignore.

2013-04-22 07:09:06 -07:00

acct.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

async.c

Merge branch 'for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2013-02-19 22:01:33 -08:00

audit_tree.c

audit: catch possible NULL audit buffers

2013-01-11 14:54:55 -08:00

audit_watch.c

audit: catch possible NULL audit buffers

2013-01-11 14:54:55 -08:00

audit.c

kernel/audit.c: avoid negative sleep durations

2013-01-11 14:54:56 -08:00

audit.h

audit: optimize audit_compare_dname_path

2012-10-12 00:32:02 -04:00

auditfilter.c

audit: fix auditfilter.c kernel-doc warnings

2013-01-10 14:35:23 -08:00

auditsc.c

audit: catch possible NULL audit buffers

2013-01-11 14:54:55 -08:00

backtracetest.c

…

bounds.c

…

capability.c

Add file_ns_capable() helper function for open-time capability checking

2013-04-14 10:06:31 -07:00

cgroup_freezer.c

cgroup: rename ->create/post_create/pre_destroy/destroy() to ->css_alloc/online/offline/free()

2012-11-19 08:13:38 -08:00

cgroup.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

compat.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

configs.c

…

context_tracking.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 18:19:48 -08:00

cpu_pm.c

…

cpu.c

Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 19:04:55 -08:00

cpuset.c

Merge branch 'for-3.9-cpuset' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2013-02-20 09:18:31 -08:00

crash_dump.c

…

cred.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2012-12-18 10:55:28 -08:00

delayacct.c

cputime: Use accessors to read task cputime stats

2013-01-27 19:23:31 +01:00

dma.c

…

elfcore.c

…

exec_domain.c

…

exit.c

Revert "lockdep: check that no locks held at freeze time"

2013-03-31 11:38:33 -07:00

extable.c

…

fork.c

userns: Don't allow CLONE_NEWUSER | CLONE_FS

2013-03-13 15:00:20 -07:00

freezer.c

freezer: change ptrace_stop/do_signal_stop to use freezable_schedule()

2012-10-26 14:27:49 -07:00

futex_compat.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

futex.c

futex: fix kernel-doc notation and spello

2013-03-12 20:42:10 -07:00

groups.c

…

hrtimer.c

hrtimer: Don't reinitialize a cpu_base lock on CPU_UP

2013-03-26 21:34:57 +01:00

hung_task.c

…

irq_work.c

Merge branch 'nohz/printk-v8' into irq/core

2013-02-05 00:48:46 +01:00

itimer.c

…

jump_label.c

jump_label: Export jump_label_rate_limit()

2012-08-06 19:00:35 +03:00

kallsyms.c

…

kcmp.c

kcmp: include linux/ptrace.h

2012-12-20 17:40:19 -08:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

locking: Adjust spin lock inlining Kconfig options

2012-09-13 17:56:13 +02:00

Kconfig.preempt

…

kexec.c

kexec: use Crash kernel for Crash kernel low

2013-04-17 12:35:34 -07:00

kmod.c

Merge branch 'master' into for-3.9-async

2013-01-23 09:31:01 -08:00

kprobes.c

kprobes: Fix a double lock bug of kprobe_mutex

2013-04-18 08:58:38 -07:00

ksysfs.c

Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-12-11 18:10:49 -08:00

kthread.c

kthread: introduce to_live_kthread()

2013-04-29 15:54:25 -07:00

latencytop.c

…

lglock.c

…

lockdep_internals.h

…

lockdep_proc.c

lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()

2012-10-24 12:39:09 +02:00

lockdep_states.h

…

lockdep.c

lockdep: Consolidate bug messages into a single print_lockdep_off() function

2013-04-26 08:37:22 +02:00

Makefile

Merge branch 'akpm' (final batch from Andrew)

2013-02-27 20:58:09 -08:00

modsign_certificate.S

MODSIGN: Avoid using .incbin in C source

2012-12-14 13:06:44 +10:30

modsign_pubkey.c

keys: use keyring_alloc() to create module signing keyring

2012-12-20 17:40:21 -08:00

module_signing.c

MODSIGN: Don't use enum-type bitfields in module signature info block

2012-12-05 11:27:24 +10:30

module-internal.h

MODSIGN: Move the magic string to the end of a module and eliminate the search

2012-10-19 17:30:40 -07:00

module.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

mutex-debug.c

…

mutex-debug.h

…

mutex.c

mutex: Back out architecture specific check for negative mutex count

2013-04-19 09:33:36 +02:00

mutex.h

…

notifier.c

…

nsproxy.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

padata.c

padata: use __this_cpu_read per-cpu helper

2012-12-06 17:16:23 +08:00

panic.c

taint: add explicit flag to show whether lock dep is still OK.

2013-01-21 17:17:57 +10:30

params.c

…

pid_namespace.c

pid: Handle the exit of a multi-threaded init.

2013-03-26 03:41:23 -07:00

pid.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

posix-cpu-timers.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 19:05:45 -08:00

posix-timers.c

posix-timers: convert to idr_alloc()

2013-02-27 19:10:19 -08:00

printk.c

printk: Provide a wake_up_klogd() off-case

2013-03-22 16:41:20 -07:00

profile.c

profiling: Remove unused timer hook

2013-01-24 15:37:26 +01:00

ptrace.c

uprobes: Add exports for module use

2013-02-08 17:47:13 +01:00

range.c

…

rcu.h

rcu: Provide RCU CPU stall warnings for tiny RCU

2013-01-28 22:06:21 -08:00

rcupdate.c

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-28 22:25:21 -08:00

rcutiny_plugin.h

rcu: Provide RCU CPU stall warnings for tiny RCU

2013-01-28 22:06:21 -08:00

rcutiny.c

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-28 22:25:21 -08:00

rcutorture.c

rcu: Allow rcutorture to be built at low optimization levels

2013-02-04 12:18:20 -08:00

rcutree_plugin.h

rcu: Make rcu_nocb_poll an early_param instead of module_param

2013-01-08 14:12:19 -08:00

rcutree_trace.c

rcu: Separate accounting of callbacks from callback-free CPUs

2012-11-16 10:05:57 -08:00

rcutree.c

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-28 22:25:21 -08:00

rcutree.h

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-28 22:25:21 -08:00

relay.c

new helper: file_inode(file)

2013-02-22 23:31:31 -05:00

res_counter.c

res_counter: return amount of charges after res_counter_uncharge()

2012-12-18 15:02:12 -08:00

resource.c

kernel/resource.c: fix stack overflow in __reserve_region_with_split()

2012-10-06 03:05:31 +09:00

rtmutex_common.h

…

rtmutex-debug.c

sched/rt: Move rt specific bits into new header file

2013-02-07 20:51:08 +01:00

rtmutex-debug.h

…

rtmutex-tester.c

locking/rtmutex/tester: Set correct permissions on sysfs files

2013-04-10 14:48:37 +02:00

rtmutex.c

sched/rt: Move rt specific bits into new header file

2013-02-07 20:51:08 +01:00

rtmutex.h

…

rwsem.c

lockdep, rwsem: provide down_write_nest_lock()

2013-01-11 14:54:55 -08:00

seccomp.c

seccomp: Make syscall skipping and nr changes more consistent

2012-10-02 21:14:29 +10:00

semaphore.c

…

signal.c

kernel/signal.c: stop info leak via the tkill and the tgkill syscalls

2013-04-17 16:10:45 -07:00

smp.c

smp: make smp_call_function_many() use logic similar to smp_call_function_single()

2013-02-21 17:22:20 -08:00

smpboot.c

kthread: Prevent unpark race which puts threads on the wrong cpu

2013-04-12 14:18:43 +02:00

smpboot.h

smpboot: Provide infrastructure for percpu hotplug threads

2012-08-13 17:01:07 +02:00

softirq.c

Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-03-05 18:10:04 -08:00

spinlock.c

…

srcu.c

srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()

2013-02-07 15:19:36 -08:00

stacktrace.c

…

stop_machine.c

stop_machine: Mark per cpu stopper enabled early

2013-02-26 22:25:17 +01:00

sys_ni.c

module: add syscall to load module from fd

2012-12-14 13:05:22 +10:30

sys.c

PM / reboot: call syscore_shutdown() after disable_nonboot_cpus()

2013-04-08 22:10:40 +02:00

sysctl_binary.c

sysctl: fix null checking in bin_dn_node_address()

2013-02-27 19:10:21 -08:00

sysctl.c

Merge tag 'arc-v3.9-rc1-late' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

2013-03-02 07:58:56 -08:00

task_work.c

task_work: task_work_add() should not succeed after exit_task_work()

2012-09-13 16:47:34 +02:00

taskstats.c

taskstats: cgroupstats_user_cmd() may leak on error

2012-10-06 03:05:31 +09:00

test_kprobes.c

…

time.c

time: don't inline EXPORT_SYMBOL functions

2013-02-21 17:22:19 -08:00

timeconst.bc

kernel: Replace timeconst.pl with a bc script

2013-02-16 23:17:25 +01:00

timer.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 18:19:48 -08:00

tracepoint.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

tsacct.c

cputime: Use accessors to read task cputime stats

2013-01-27 19:23:31 +01:00

uid16.c

…

up.c

…

user_namespace.c

userns: Changing any namespace id mappings should require privileges

2013-04-14 18:11:32 -07:00

user-return-notifier.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

user.c

userns: Restrict when proc and sysfs can be mounted

2013-03-27 07:50:08 -07:00

utsname_sysctl.c

kernel/utsname_sysctl.c: put get/get_uts() into CONFIG_PROC_SYSCTL code block

2013-02-27 19:10:22 -08:00

utsname.c

kernel/utsname.c: fix wrong comment about clone_uts_ns()

2013-02-27 19:10:22 -08:00

wait.c

propagate name change to comments in kernel source

2012-12-06 10:39:54 +01:00

watchdog.c

Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-22 19:25:09 -08:00

workqueue_internal.h

workqueue: rename cpu_workqueue to pool_workqueue

2013-02-13 19:29:12 -08:00

workqueue.c

Merge branch 'for-3.9-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2013-03-18 18:47:07 -07:00