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authorWill Deacon <will.deacon@arm.com>2017-10-24 13:22:48 +0300
committerIngo Molnar <mingo@kernel.org>2017-10-24 14:17:33 +0300
commit506458efaf153c1ea480591c5602a5a3ba5a3b76 (patch)
treec4ac0a89bf23993036720ec8883fff0740bf9019 /kernel/task_work.c
parent76ebbe78f7390aee075a7f3768af197ded1bdfbb (diff)
downloadlinux-506458efaf153c1ea480591c5602a5a3ba5a3b76.tar.xz
locking/barriers: Convert users of lockless_dereference() to READ_ONCE()
READ_ONCE() now has an implicit smp_read_barrier_depends() call, so it can be used instead of lockless_dereference() without any change in semantics. Signed-off-by: Will Deacon <will.deacon@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1508840570-22169-4-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/task_work.c')
-rw-r--r--kernel/task_work.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/task_work.c b/kernel/task_work.c
index 836a72a66fba..9a9f262fc53d 100644
--- a/kernel/task_work.c
+++ b/kernel/task_work.c
@@ -67,7 +67,7 @@ task_work_cancel(struct task_struct *task, task_work_func_t func)
* we raced with task_work_run(), *pprev == NULL/exited.
*/
raw_spin_lock_irqsave(&task->pi_lock, flags);
- while ((work = lockless_dereference(*pprev))) {
+ while ((work = READ_ONCE(*pprev))) {
if (work->func != func)
pprev = &work->next;
else if (cmpxchg(pprev, work, work->next) == work)