linux-kernel - [PATCH] kernel/sched: Use RCU_INIT

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Date:	Mon, 24 Mar 2014 00:36:27 +0530
From:	Monam Agarwal <monamagarwal123@...il.com>
To:	mingo@...hat.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] kernel/sched: Use RCU_INIT_POINTER(x, NULL) in fair.c

This patch replaces rcu_assign_pointer(x, NULL) with RCU_INIT_POINTER(x, NULL)

The rcu_assign_pointer() ensures that the initialization of a structure       
is carried out before storing a pointer to that structure. 
And in the case of the NULL pointer, there is no structure to initialize. 
So, rcu_assign_pointer(p, NULL) can be safely converted to RCU_INIT_POINTER(p, NULL)

Signed-off-by: Monam Agarwal <monamagarwal123@...il.com>
---
 kernel/sched/fair.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9b4c4f3..13b66aa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1573,7 +1573,7 @@ void task_numa_free(struct task_struct *p)
 		list_del(&p->numa_entry);
 		grp->nr_tasks--;
 		spin_unlock(&grp->lock);
-		rcu_assign_pointer(p->numa_group, NULL);
+		RCU_INIT_POINTER(p->numa_group, NULL);
 		put_numa_group(grp);
 	}
 
-- 
1.7.9.5

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