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Message-ID: <20140822141536.GA32051@ada> Date: Fri, 22 Aug 2014 17:15:36 +0300 From: Andreea-Cristina Bernat <bernat.ada@...il.com> To: a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com, acme@...nel.org, linux-kernel@...r.kernel.org Cc: paulmck@...ux.vnet.ibm.com Subject: [PATCH] kernel: events: callchain: 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> --- kernel/events/callchain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c index 97b67df..f2a88de 100644 --- a/kernel/events/callchain.c +++ b/kernel/events/callchain.c @@ -52,7 +52,7 @@ static void release_callchain_buffers(void) struct callchain_cpus_entries *entries; entries = callchain_cpus_entries; - rcu_assign_pointer(callchain_cpus_entries, NULL); + RCU_INIT_POINTER(callchain_cpus_entries, NULL); call_rcu(&entries->rcu_head, release_callchain_buffers_rcu); } -- 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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