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Date: Fri, 22 Aug 2014 15:40:44 +0300 From: Andreea-Cristina Bernat <bernat.ada@...il.com> To: axboe@...nel.dk, linux-kernel@...r.kernel.org Cc: paulmck@...ux.vnet.ibm.com Subject: [PATCH] blk-cgroup: Replace rcu_assign_pointer() with RCU_INIT_POINTER() The use of "rcu_assign_pointer()" is NULLing out the pointer. According to RCU_INIT_POINTER()'s block comment: "1. This use of RCU_INIT_POINTER() is NULLing out the pointer" it is better to use it instead of rcu_assign_pointer() because it has a smaller overhead. The following Coccinelle semantic patch was used: @@ @@ - rcu_assign_pointer + RCU_INIT_POINTER (..., NULL) Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com> --- block/blk-cgroup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 069bc20..9a95b3f 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -337,7 +337,7 @@ static void blkg_destroy(struct blkcg_gq *blkg) * will. Hint assignment itself can race safely. */ if (rcu_access_pointer(blkcg->blkg_hint) == blkg) - rcu_assign_pointer(blkcg->blkg_hint, NULL); + RCU_INIT_POINTER(blkcg->blkg_hint, NULL); /* * If root blkg is destroyed. Just clear the pointer since root_rl -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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