[cpuops inc_return V1 7/9] fs: Use this_cpu_inc_return in buffer.c

[Christoph Lameter <cl@linux.com>]

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__this_cpu_inc can create a single instruction with the same effect
as the _get_cpu_var(..)++ construct in buffer.c.

Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Lameter <cl@linux.com>

---
 fs/buffer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/fs/buffer.c
===================================================================
--- linux-2.6.orig/fs/buffer.c	2010-12-06 10:56:21.000000000 -0600
+++ linux-2.6/fs/buffer.c	2010-12-06 10:56:26.000000000 -0600
@@ -3201,7 +3201,7 @@ static void recalc_bh_state(void)
 	int i;
 	int tot = 0;
 
-	if (__get_cpu_var(bh_accounting).ratelimit++ < 4096)
+	if (__this_cpu_inc_return(bh_accounting.ratelimit) - 1 < 4096)
 		return;
 	__this_cpu_write(bh_accounting.ratelimit, 0);
 	for_each_online_cpu(i)