From: H. Peter Anvin Date: Mon, 16 Jan 2012 19:23:29 +0000 (-0800) Subject: random: Adjust the number of loops when initializing X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2dac8e54f988ab58525505d7ef982493374433c3;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git random: Adjust the number of loops when initializing When we are initializing using arch_get_random_long() we only need to loop enough times to touch all the bytes in the buffer; using poolwords for that does twice the number of operations necessary on a 64-bit machine, since in the random number generator code "word" means 32 bits. Signed-off-by: H. Peter Anvin Cc: "Theodore Ts'o" Link: http://lkml.kernel.org/r/1324589281-31931-1-git-send-email-tytso@mit.edu --- diff --git a/drivers/char/random.c b/drivers/char/random.c index 30794779c523..9a2156d77629 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -975,7 +975,7 @@ static void init_std_data(struct entropy_store *r) now = ktime_get_real(); mix_pool_bytes(r, &now, sizeof(now)); - for (i = r->poolinfo->poolwords; i; i--) { + for (i = r->poolinfo->POOLBYTES; i > 0; i -= sizeof flags) { if (!arch_get_random_long(&flags)) break; mix_pool_bytes(r, &flags, sizeof(flags));