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random: Adjust the number of loops when initializing

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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 <hpa@linux.intel.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Link: http://lkml.kernel.org/r/1324589281-31931-1-git-send-email-tytso@mit.edu
This commit is contained in:
H. Peter Anvin 2012-01-16 11:23:29 -08:00
parent 3e88bdff1c
commit 2dac8e54f9
1 changed files with 1 additions and 1 deletions
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2
drivers/char/random.c
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@ -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));