From 2dac8e54f988ab58525505d7ef982493374433c3 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Mon, 16 Jan 2012 11:23:29 -0800 Subject: [PATCH] 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 --- drivers/char/random.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/random.c b/drivers/char/random.c index 3079477..9a2156d 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)); -- 2.7.4