Messages in this thread Patch in this message | | | Date | Mon, 06 Dec 2010 11:40:06 -0600 | From | Christoph Lameter <> | Subject | [cpuops inc_return V1 8/9] random: Use this_cpu_inc_return |
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__this_cpu_inc can create a single instruction to do the same as __get_cpu_var()++.
Cc: Richard Kennedy <richard@rsk.demon.co.uk> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Christoph Lameter <cl@linux.com>
--- drivers/char/random.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-2.6/drivers/char/random.c =================================================================== --- linux-2.6.orig/drivers/char/random.c 2010-12-06 11:01:06.000000000 -0600 +++ linux-2.6/drivers/char/random.c 2010-12-06 11:19:38.000000000 -0600 @@ -626,7 +626,7 @@ static void add_timer_randomness(struct preempt_disable(); /* if over the trickle threshold, use only 1 in 4096 samples */ if (input_pool.entropy_count > trickle_thresh && - (__get_cpu_var(trickle_count)++ & 0xfff)) + ((__this_cpu_inc_return(trickle_count) - 1) & 0xfff)) goto out; sample.jiffies = jiffies;
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