lisa/android_kernel_xiaomi_sm8350
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
db70089722
android_kernel_xiaomi_sm8350/kernel
History
Oleg Nesterov db70089722 workqueues: implement flush_work() 
Most of users of flush_workqueue() can be changed to use cancel_work_sync(),
but sometimes we really need to wait for the completion and cancelling is not
an option. schedule_on_each_cpu() is good example.

Add the new helper, flush_work(work), which waits for the completion of the
specific work_struct. More precisely, it "flushes" the result of of the last
queue_work() which is visible to the caller.

For example, this code

	queue_work(wq, work);
	/* WINDOW */
	queue_work(wq, work);

	flush_work(work);

doesn't necessary work "as expected". What can happen in the WINDOW above is

	- wq starts the execution of work->func()

	- the caller migrates to another CPU

now, after the 2nd queue_work() this work is active on the previous CPU, and
at the same time it is queued on another. In this case flush_work(work) may
return before the first work->func() completes.

It is trivial to add another helper

	int flush_work_sync(struct work_struct *work)
	{
		return flush_work(work) || wait_on_work(work);
	}

which works "more correctly", but it has to iterate over all CPUs and thus
it much slower than flush_work().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Max Krasnyansky <maxk@qualcomm.com>
Acked-by: Jarek Poplawski <jarkao2@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25 10:53:40 -07:00
..
irq kernel/irq/manage.c: replace a printk + WARN_ON() to a WARN() 2008-07-25 10:53:29 -07:00
power pm: fix try_to_freeze_tasks()'s use of do_div() 2008-07-24 10:47:24 -07:00
time Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-24 12:55:01 -07:00
trace cpumask: Replace cpumask_of_cpu with cpumask_of_cpu_ptr 2008-07-18 22:02:57 +02:00
.gitignore
acct.c
audit_tree.c
audit.c [PATCH] remove useless argument type in audit_filter_user() 2008-06-24 23:36:35 -04:00
audit.h
auditfilter.c [PATCH] remove useless argument type in audit_filter_user() 2008-06-24 23:36:35 -04:00
auditsc.c x86_64 syscall audit fast-path 2008-07-23 17:47:32 -07:00
backtracetest.c backtrace: replace timer with tasklet + completions 2008-06-27 18:09:16 +02:00
bounds.c
capability.c security: filesystem capabilities refactor kernel code 2008-07-24 10:47:22 -07:00
cgroup_debug.c
cgroup.c cgroup_clone: use pid of newly created task for new cgroup 2008-07-25 10:53:37 -07:00
compat.c
configs.c
cpu.c Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 19:36:53 -07:00
cpuset.c cpuset: two minor code-cleanups 2008-07-25 10:53:38 -07:00
delayacct.c
dma.c
exec_domain.c remove CONFIG_KMOD from core kernel code 2008-07-22 19:24:31 +10:00
exit.c coredump: kill mm->core_done 2008-07-25 10:53:40 -07:00
extable.c
fork.c coredump: move mm->core_waiters into struct core_state 2008-07-25 10:53:39 -07:00
futex_compat.c
futex.c futexes: fix fault handling in futex_lock_pi 2008-06-23 13:31:15 +02:00
hrtimer.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
itimer.c
kallsyms.c kallsyms: fix potential overflow in binary search 2008-07-25 10:53:27 -07:00
Kconfig.hz sched: fix hrtick & generic-ipi dependency 2008-07-23 11:18:28 +02:00
Kconfig.preempt
kexec.c
kfifo.c
kgdb.c kgdb: sparse fix 2008-06-24 10:52:55 -05:00
kmod.c call_usermodehelper(): increase reliability 2008-07-25 10:53:28 -07:00
kprobes.c kprobes: remove redundant config check 2008-07-25 10:53:30 -07:00
ksysfs.c
kthread.c kthread: reduce stack pressure in create_kthread and kthreadd 2008-07-18 18:46:58 +02:00
latencytop.c
lockdep_internals.h lockdep: add lock_class information to lock_chain and output it 2008-06-24 01:28:20 +02:00
lockdep_proc.c lockdep: add lock_class information to lock_chain and output it 2008-06-24 01:28:20 +02:00
lockdep.c Merge branch 'core/locking' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 14:55:13 -07:00
Makefile build kernel/profile.o only when requested 2008-07-25 10:53:27 -07:00
marker.c
module.c modules: Take a shortcut for checking if an address is in a module 2008-07-22 19:24:28 +10:00
mutex-debug.c
mutex-debug.h
mutex.c __mutex_lock_common: use signal_pending_state() 2008-06-10 11:45:09 +02:00
mutex.h
notifier.c
ns_cgroup.c cgroup_clone: use pid of newly created task for new cgroup 2008-07-25 10:53:37 -07:00
nsproxy.c cgroup_clone: use pid of newly created task for new cgroup 2008-07-25 10:53:37 -07:00
panic.c Add a WARN() macro; this is WARN_ON() + printk arguments 2008-07-25 10:53:29 -07:00
params.c
pid_namespace.c
pid.c
pm_qos_params.c pm_qos_params: BKL pushdown 2008-07-02 15:06:24 -06:00
posix-cpu-timers.c posix-timers: print RT watchdog message 2008-05-24 18:49:22 +02:00
posix-timers.c posix timers: release_posix_timer: kill the bogus put_task_struct(->it_process); 2008-07-25 10:53:38 -07:00
printk.c printk ratelimiting rewrite 2008-07-25 10:53:29 -07:00
profile.c build kernel/profile.o only when requested 2008-07-25 10:53:27 -07:00
ptrace.c ptrace children revamp 2008-07-16 18:02:33 -07:00
rcuclassic.c Merge branch 'linus' into cpus4096 2008-07-16 00:29:07 +02:00
rcupdate.c Merge branch 'generic-ipi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-15 14:12:03 -07:00
rcupreempt_trace.c
rcupreempt.c Merge branch 'linus' into cpus4096 2008-07-16 00:29:07 +02:00
rcutorture.c rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers) 2008-06-26 09:24:33 +02:00
relay.c splice: fix sendfile() issue with relay 2008-05-28 14:49:27 +02:00
res_counter.c cgroup files: convert res_counter_write() to be a cgroups write_string() handler 2008-07-25 10:53:36 -07:00
resource.c
rtmutex_common.h
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
rtmutex.h
rwsem.c
sched_clock.c Merge branch 'sched/clock' into sched/devel 2008-07-14 12:19:13 +02:00
sched_cpupri.c sched: use a 2-d bitmap for searching lowest-pri CPU 2008-06-06 15:19:28 +02:00
sched_cpupri.h sched: fix the cpuprio count really 2008-06-06 15:19:44 +02:00
sched_debug.c sched: add full schedstats to /proc/sched_debug 2008-06-27 14:31:31 +02:00
sched_fair.c Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 19:36:53 -07:00
sched_features.h sched: bias effective_load() error towards failing wake_affine(). 2008-06-27 14:31:47 +02:00
sched_idletask.c
sched_rt.c Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-24 12:53:51 -07:00
sched_stats.h sched: fix accounting in task delay accounting & migration 2008-07-04 12:50:23 +02:00
sched.c Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 19:36:53 -07:00
seccomp.c
semaphore.c mmiotrace broken in linux-next (8-bit writes only) 2008-07-01 10:14:06 +02:00
signal.c coredump: move mm->core_waiters into struct core_state 2008-07-25 10:53:39 -07:00
smp.c generic ipi function calls: wait on alloc failure fallback 2008-07-15 14:12:20 -07:00
softirq.c Merge branch 'linus' into timers/nohz 2008-07-18 19:53:16 +02:00
softlockup.c softlockup: print a module list on being stuck 2008-07-05 08:51:24 +02:00
spinlock.c
srcu.c
stacktrace.c stacktrace: fix modular build, export print_stack_trace and save_stack_trace 2008-06-30 09:20:55 +02:00
stop_machine.c cpumask: Replace cpumask_of_cpu with cpumask_of_cpu_ptr 2008-07-18 22:02:57 +02:00
sys_ni.c flag parameters: fix compile error of sys_epoll_create1 2008-07-25 10:53:26 -07:00
sys.c call_usermodehelper(): increase reliability 2008-07-25 10:53:28 -07:00
sysctl_check.c
sysctl.c printk ratelimiting rewrite 2008-07-25 10:53:29 -07:00
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-14 16:06:58 -07:00
tsacct.c
uid16.c
user_namespace.c
user.c
utsname_sysctl.c
utsname.c
wait.c
workqueue.c workqueues: implement flush_work() 2008-07-25 10:53:40 -07:00