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authorAndreea-Cristina Bernat <bernat.ada@gmail.com>2014-08-22 14:15:36 (GMT)
committerIngo Molnar <mingo@kernel.org>2014-09-09 04:53:04 (GMT)
commite0455e194a5e0cf49bc7596a20d4f7e47995b9c6 (patch)
tree345bbec58cd7b2efcaf9752b7879f75229a7e950
parentbdea534db894ea19320f470ce2e63b1d9de96a15 (diff)
downloadlinux-e0455e194a5e0cf49bc7596a20d4f7e47995b9c6.tar.xz
perf/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@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: paulmck@linux.vnet.ibm.com Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Link: http://lkml.kernel.org/r/20140822141536.GA32051@ada Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--kernel/events/callchain.c2
1 files changed, 1 insertions, 1 deletions
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);
}