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Subject[PATCH v2 8/9] task_work: Replace smp_read_barrier_depends() with lockless_dereference()
Date
Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the change.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
---
kernel/task_work.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/task_work.c b/kernel/task_work.c
index 8727032..b5599ce 100644
--- a/kernel/task_work.c
+++ b/kernel/task_work.c
@@ -62,8 +62,7 @@ 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 = ACCESS_ONCE(*pprev))) {
- smp_read_barrier_depends();
+ while ((work = lockless_dereference(*pprev))) {
if (work->func != func)
pprev = &work->next;
else if (cmpxchg(pprev, work, work->next) == work)
--
1.9.1


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