Tejun Heo f56c3196f2 async: fix __lowest_in_progress() ... Commit 083b804c4d ("async: use workqueue for worker pool") made it possible that async jobs are moved from pending to running out-of-order. While pending async jobs will be queued and dispatched for execution in the same order, nothing guarantees they'll enter "1) move self to the running queue" of async_run_entry_fn() in the same order. Before the conversion, async implemented its own worker pool. An async worker, upon being woken up, fetches the first item from the pending list, which kept the executing lists sorted. The conversion to workqueue was done by adding work_struct to each async_entry and async just schedules the work item. The queueing and dispatching of such work items are still in order but now each worker thread is associated with a specific async_entry and moves that specific async_entry to the executing list. So, depending on which worker reaches that point earlier, which is non-deterministic, we may end up moving an async_entry with larger cookie before one with smaller one. This broke __lowest_in_progress(). running->domain may not be properly sorted and is not guaranteed to contain lower cookies than pending list when not empty. Fix it by ensuring sort-inserting to the running list and always looking at both pending and running when trying to determine the lowest cookie. Over time, the async synchronization implementation became quite messy. We better restructure it such that each async_entry is linked to two lists - one global and one per domain - and not move it when execution starts. There's no reason to distinguish pending and running. They behave the same for synchronization purposes. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-01-22 16:21:24 -08:00
..
debug	module: add new state MODULE_STATE_UNFORMED.	2013-01-12 13:27:05 +10:30
events	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-12-17 15:44:47 -08:00
gcov
irq	irq: tsk->comm is an array	2012-12-18 15:02:11 -08:00
power	Merge branch 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-12-12 08:18:24 -08:00
sched	wake_up_process() should be never used to wakeup a TASK_STOPPED/TRACED task	2013-01-22 10:08:17 -08:00
time	Merge tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2012-12-13 15:31:08 -08:00
trace	ftrace: Be first to run code modification on modules	2013-01-21 13:21:50 -05:00
.gitignore
acct.c	vfs: make path_openat take a struct filename pointer	2012-10-12 20:15:09 -04:00
async.c	async: fix __lowest_in_progress()	2013-01-22 16:21:24 -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
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
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
cgroup.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-12-17 20:58:12 -08:00
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
compat.c	x32: fix sigtimedwait	2012-12-26 01:15:03 -05:00
configs.c
context_tracking.c	context_tracking: New context tracking susbsystem	2012-11-30 11:40:07 -08:00
cpu.c	Merge branch 'x86-bsp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-12-11 19:56:33 -08:00
cpu_pm.c
cpuset.c	cpuset: use N_MEMORY instead N_HIGH_MEMORY	2012-12-12 17:38:32 -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
dma.c
elfcore.c
exec_domain.c
exit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-12-17 15:44:47 -08:00
extable.c
fork.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	2013-01-20 13:58:48 -08:00
freezer.c	freezer: change ptrace_stop/do_signal_stop to use freezable_schedule()	2012-10-26 14:27:49 -07:00
futex.c	futex: avoid wake_futex() for a PI futex_q	2012-11-26 17:41:24 -08:00
futex_compat.c
groups.c
hrtimer.c
hung_task.c
irq_work.c
itimer.c
jump_label.c
kallsyms.c
kcmp.c	kcmp: include linux/ptrace.h	2012-12-20 17:40:19 -08:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kdump: remove unneeded include	2012-10-06 03:05:19 +09:00
kfifo.c
kmod.c	Bury the conditionals from kernel_thread/kernel_execve series	2012-12-19 18:07:38 -05:00
kprobes.c
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: use N_MEMORY instead N_HIGH_MEMORY	2012-12-12 17:38:33 -08:00
latencytop.c
lglock.c
lockdep.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
Makefile	Nothing all that exciting; a new module-from-fd syscall for those who want	2012-12-19 07:55:08 -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-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	module: fix missing module_mutex unlock	2013-01-20 20:22:58 -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
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c	userns: Implement unshare of the user namespace	2012-11-20 04:18:14 -08:00
padata.c	padata: use __this_cpu_read per-cpu helper	2012-12-06 17:16:23 +08:00
panic.c
params.c
pid.c	pidns: Stop pid allocation when init dies	2012-12-25 16:10:05 -08:00
pid_namespace.c	pidns: Stop pid allocation when init dies	2012-12-25 16:10:05 -08:00
posix-cpu-timers.c	A few /dev/random improvements for the v3.8 merge window.	2012-12-19 20:23:37 -08:00
posix-timers.c
printk.c	printk: fix incorrect length from print_time() when seconds > 99999	2013-01-04 16:11:48 -08:00
profile.c	propagate name change to comments in kernel source	2012-12-06 10:39:54 +01:00
ptrace.c	ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL	2013-01-22 10:08:00 -08:00
range.c
rcu.h	rcu: Add a module parameter to force use of expedited RCU primitives	2012-10-23 14:54:08 -07:00
rcupdate.c	rcu: Add a module parameter to force use of expedited RCU primitives	2012-10-23 14:54:08 -07:00
rcutiny.c	rcu: Fix TINY_RCU rcu_is_cpu_rrupt_from_idle check	2012-11-13 14:08:34 -08:00
rcutiny_plugin.h	rcu: Add a module parameter to force use of expedited RCU primitives	2012-10-23 14:54:08 -07:00
rcutorture.c	Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'srcu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD	2012-11-16 09:59:58 -08:00
rcutree.c	context_tracking: New context tracking susbsystem	2012-11-30 11:40:07 -08:00
rcutree.h	rcu: Separate accounting of callbacks from callback-free CPUs	2012-11-16 10:05:57 -08:00
rcutree_plugin.h	rcu: Separate accounting of callbacks from callback-free CPUs	2012-11-16 10:05:57 -08:00
rcutree_trace.c	rcu: Separate accounting of callbacks from callback-free CPUs	2012-11-16 10:05:57 -08:00
relay.c
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-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.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	ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL	2013-01-22 10:08:00 -08:00
smp.c
smpboot.c
smpboot.h
softirq.c	cputime: Specialize irq vtime hooks	2012-10-29 21:31:32 +01:00
spinlock.c
srcu.c	Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'srcu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD	2012-11-16 09:59:58 -08:00
stacktrace.c
stop_machine.c
sys.c	cputime: Rename thread_group_times to thread_group_cputime_adjusted	2012-11-28 17:07:57 +01:00
sys_ni.c	module: add syscall to load module from fd	2012-12-14 13:05:22 +10:30
sysctl.c	Automatic NUMA Balancing V11	2012-12-16 15:18:08 -08:00
sysctl_binary.c	pidns: Use task_active_pid_ns where appropriate	2012-11-19 05:59:09 -08:00
task_work.c
taskstats.c	taskstats: cgroupstats_user_cmd() may leak on error	2012-10-06 03:05:31 +09:00
test_kprobes.c
time.c	time: Move update_vsyscall definitions to timekeeper_internal.h	2012-09-24 12:38:06 -04:00
timeconst.pl
timer.c	timers: Fix endless looping between cascade() and internal_add_timer()	2012-10-09 21:27:14 +02:00
tracepoint.c
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c	proc: Usable inode numbers for the namespace file descriptors.	2012-11-20 04:19:49 -08:00
user_namespace.c	userns: Fix typo in description of the limitation of userns_install	2012-12-14 18:36:36 -08:00
utsname.c	userns: Require CAP_SYS_ADMIN for most uses of setns.	2012-12-14 16:12:03 -08:00
utsname_sysctl.c
wait.c	propagate name change to comments in kernel source	2012-12-06 10:39:54 +01:00
watchdog.c	watchdog: Fix disable/enable regression	2012-12-19 12:10:33 -08:00
workqueue.c	Merge branch 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2012-12-12 08:15:13 -08:00
workqueue_sched.h