linux-kernel - [PATCH 2/3] lockref: use cpu_relax

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Date:	Fri, 27 Sep 2013 10:03:53 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tony Luck <tony.luck@...el.com>, Waiman Long <waiman.long@...com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: [PATCH 2/3] lockref: use cpu_relax_simple()

Make use of cpu_relax_simple() so architectures can override the default
cpu_relax() semantics.
This is especially useful for s390, where cpu_relax() means that the we
yield() the current (virtual) cpu and therefore is very expensive.

Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
---
 lib/lockref.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/lockref.c b/lib/lockref.c
index 677d036..1a00c33 100644
--- a/lib/lockref.c
+++ b/lib/lockref.c
@@ -19,7 +19,7 @@
 		if (likely(old.lock_count == prev.lock_count)) {		\
 			SUCCESS;						\
 		}								\
-		cpu_relax();							\
+		cpu_relax_simple();						\
 	}									\
 } while (0)
 
-- 
1.8.3.4

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