linux-kernel - [PATCH 12/16] task_work: Replace smp_read_barrier_depends() with lockless

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Date:	Thu, 13 Nov 2014 14:24:18 -0500
From:	Pranith Kumar <bobby.prani@...il.com>
To:	linux-kernel@...r.kernel.org (open list)
Cc:	paulmck@...ux.vnet.ibm.com
Subject: [PATCH 12/16] task_work: Replace smp_read_barrier_depends() with lockless_dereference()

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@...il.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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