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61e96496d3c949701a48b908f99f4ed891cd1101
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Oleg Nesterov 61e96496d3 task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works 
Change task_work_cancel() to use lockless_dereference(), this is what
the code really wants but we didn't have this helper when it was
written.

Also add the fast-path task->task_works == NULL check, in the likely
case this task has no pending works and we can avoid
spin_lock(task->pi_lock).

While at it, change other users of ACCESS_ONCE() to use READ_ONCE().

Link: http://lkml.kernel.org/r/20160610150042.GA13868@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Andrea Parri <parri.andrea@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>
2016-08-02 19:35:02 -04:00
..
bpf
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2016-07-27 12:03:20 -07:00
configs
…
debug
mm/init: Add 'rodata=off' boot cmdline parameter to disable read-only kernel mappings
2016-02-22 08:51:37 +01:00
events
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-29 13:55:30 -07:00
gcov
gcov: add support for gcc version >= 6
2016-07-15 14:54:27 +09:00
irq
genirq: Fix missing irq allocation affinity hint
2016-07-19 10:49:47 +02:00
livepatch
Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus
2016-05-17 12:06:35 +02:00
locking
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-25 12:41:29 -07:00
power
mm, vmscan: move LRU lists to node
2016-07-28 16:07:41 -07:00
printk
printk: when dumping regs, show the stack, not thread_info
2016-07-28 16:07:41 -07:00
rcu
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-29 13:55:30 -07:00
sched
Merge tag 'for-linus-4.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
2016-07-27 11:35:37 -07:00
time
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-29 13:55:30 -07:00
trace
Merge tag 'trace-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2016-07-28 18:20:09 -07:00
.gitignore
…
acct.c
…
async.c
…
audit_fsnotify.c
wrappers for ->i_mutex access
2016-01-22 18:04:28 -05:00
audit_tree.c
audit: cleanup prune_tree_thread
2016-04-04 09:46:47 -04:00
audit_watch.c
don't bother with ->d_inode->i_sb - it's always equal to ->d_sb
2016-04-10 17:11:51 -04:00
audit.c
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
2016-07-29 17:54:17 -07:00
audit.h
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
2016-07-29 17:54:17 -07:00
auditfilter.c
audit: add fields to exclude filter by reusing user filter
2016-06-27 11:01:00 -04:00
auditsc.c
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
2016-07-29 17:54:17 -07:00
backtracetest.c
…
bounds.c
…
capability.c
kernel: Add noaudit variant of ns_capable()
2016-06-06 20:16:18 +10:00
cgroup_freezer.c
cgroup: kill cgrp_ss_priv[CGROUP_CANFORK_COUNT] and friends
2015-12-03 10:24:08 -05:00
cgroup_pids.c
cgroup: Use lld instead of ld when printing pids controller events_limit
2016-06-21 15:03:36 -04:00
cgroup.c
Merge branch 'for-4.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2016-07-29 14:29:04 -07:00
compat.c
…
configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
timers/core: Correct callback order during CPU hot plug
2016-07-28 18:56:22 +02:00
cpuset.c
cpuset, mm: fix TIF_MEMDIE check in cpuset_change_task_nodemask
2016-07-28 16:07:41 -07:00
crash_dump.c
…
cred.c
cred: Reject inodes with invalid ids in set_create_file_as()
2016-06-30 18:05:09 -05:00
delayacct.c
kmemcg: account certain kmem allocations to memcg
2016-01-14 16:00:49 -08:00
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-25 13:59:34 -07:00
extable.c
…
fork.c
mm: fix memcg stack accounting for sub-page stacks
2016-07-28 16:07:41 -07:00
freezer.c
freezer, oom: check TIF_MEMDIE on the correct task
2016-07-28 16:07:41 -07:00
futex_compat.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
futex.c
futex: Calculate the futex key based on a tail page for file-based futexes
2016-06-08 19:23:54 +02:00
groups.c
…
hung_task.c
kernel/hung_task.c: use timeout diff when timeout is updated
2016-03-22 15:36:02 -07:00
irq_work.c
…
jump_label.c
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-25 12:41:29 -07:00
kallsyms.c
kallsyms: add support for relative offsets in kallsyms address table
2016-03-15 16:55:16 -07:00
kcmp.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kernel/kcov: unproxify debugfs file's fops
2016-06-15 04:56:35 -07:00
kexec_core.c
s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()
2016-05-23 17:04:14 -07:00
kexec_file.c
kexec: introduce a protection mechanism for the crashkernel reserved memory
2016-05-23 17:04:14 -07:00
kexec_internal.h
kexec: move some memembers and definitions within the scope of CONFIG_KEXEC_FILE
2016-01-20 17:09:18 -08:00
kexec.c
s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()
2016-05-23 17:04:14 -07:00
kmod.c
…
kprobes.c
…
ksysfs.c
rcu: Remove TINY_RCU bloat from pointless boot parameters
2015-12-07 16:59:37 -08:00
kthread.c
…
latencytop.c
sched/debug: Make schedstats a runtime tunable that is disabled by default
2016-02-09 11:54:23 +01:00
Makefile
ELF/MIPS build fix
2016-05-23 17:04:14 -07:00
membarrier.c
…
memremap.c
Merge tag 'libnvdimm-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2016-07-28 17:38:16 -07:00
module_signing.c
KEYS: Move the point of trust determination to __key_link()
2016-04-11 22:43:43 +01:00
module-internal.h
…
module.c
module: preserve Elf information for livepatch modules
2016-04-01 15:00:10 +02:00
notifier.c
…
nsproxy.c
cgroup: introduce cgroup namespaces
2016-02-16 13:04:58 -05:00
padata.c
kernel/padata.c: hide unused functions
2016-05-19 19:12:14 -07:00
panic.c
printk/nmi: flush NMI messages on the system panic
2016-05-20 17:58:30 -07:00
params.c
…
pid_namespace.c
…
pid.c
remove lots of IS_ERR_VALUE abuses
2016-05-27 15:26:11 -07:00
profile.c
profile: Convert to hotplug state machine
2016-07-15 10:41:42 +02:00
ptrace.c
ptrace: change __ptrace_unlink() to clear ->ptrace under ->siglock
2016-03-22 15:36:02 -07:00
range.c
…
reboot.c
…
relay.c
kernel/relay.c: fix potential memory leak
2016-06-09 14:23:11 -07:00
resource.c
/proc/iomem: only expose physical resource addresses to privileged users
2016-04-14 12:56:09 -07:00
seccomp.c
seccomp: recheck the syscall after RET_TRACE
2016-06-14 10:54:41 -07:00
signal.c
signals: Use hrtimer for sigtimedwait()
2016-07-07 10:35:07 +02:00
smp.c
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-29 13:55:30 -07:00
smpboot.c
cpu/hotplug: Unpark smpboot threads from the state machine
2016-03-01 20:36:56 +01:00
smpboot.h
cpu/hotplug: Create hotplug threads
2016-03-01 20:36:56 +01:00
softirq.c
arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections
2016-03-25 16:37:42 -07:00
stacktrace.c
…
stop_machine.c
stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE
2016-07-27 11:12:11 +02:00
sys_ni.c
vfs: add copy_file_range syscall and vfs helper
2015-12-01 14:00:53 -05:00
sys.c
prctl: make PR_SET_THP_DISABLE wait for mmap_sem killable
2016-05-23 17:04:14 -07:00
sysctl_binary.c
kernel/sysctl_binary.c: use generic UUID library
2016-05-20 17:58:30 -07:00
sysctl.c
mm: convert zone_reclaim to node_reclaim
2016-07-28 16:07:41 -07:00
task_work.c
task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works
2016-08-02 19:35:02 -04:00
taskstats.c
taskstats: use the libnl API to align nlattr on 64-bit
2016-04-23 20:13:25 -04:00
test_kprobes.c
…
torture.c
torture: Stop onoff task if there is only one cpu
2016-06-14 16:03:28 -07:00
tracepoint.c
kernel/...: convert pr_warning to pr_warn
2016-03-22 15:36:02 -07:00
tsacct.c
time, acct: Drop irq save & restore from __acct_update_integrals()
2016-02-29 09:53:09 +01:00
uid16.c
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up.c
…
user_namespace.c
fs: Limit file caps to the user namespace of the super block
2016-06-24 10:40:31 -05:00
user-return-notifier.c
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user.c
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utsname_sysctl.c
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utsname.c
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watchdog.c
Revert "perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86"
2016-07-10 20:58:36 +02:00
workqueue_internal.h
sched/core: Get rid of 'cpu' argument in wq_worker_sleeping()
2016-03-02 10:28:47 -05:00
workqueue.c
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-07-29 13:55:30 -07:00