fs: Use this_cpu_inc_return in buffer.c

__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>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

fs/buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 137d9de..2219a76 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3201,7 +3201,7 @@
 	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)