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| author | Christoph Lameter <cl@linux.com> | 2010-12-06 11:40:06 -0600 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2010-12-17 15:18:05 +0100 |
| commit | b29c617af3b09d150d3889836c24d39564b39180 (patch) | |
| tree | 17514cd85f64917e96d736b6dc5ac681dab93955 | |
| parent | ee1be8626355e6a1f3f8c44e2351ff2661c5998d (diff) | |
| download | linux-b29c617af3b09d150d3889836c24d39564b39180.tar.gz linux-b29c617af3b09d150d3889836c24d39564b39180.tar.bz2 linux-b29c617af3b09d150d3889836c24d39564b39180.zip | |
random: Use this_cpu_inc_return
__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>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
| -rw-r--r-- | drivers/char/random.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 5a1aa64f4e76..72a4fcb17745 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -626,7 +626,7 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) 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; |