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Commit 7a222156 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-rdrand-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

* 'x86-rdrand-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  random: Use arch_get_random_int instead of cycle counter if avail
parents 2c364faa cf833d0b

drivers/char/random.c

+6 −2
Original line number Original line Diff line number Diff line
@@ -624,8 +624,8 @@ static struct timer_rand_state input_timer_state; 
static void add_timer_randomness(struct timer_rand_state *state, unsigned num)

static void add_timer_randomness(struct timer_rand_state *state, unsigned num)

{

{

	struct {

	struct {

		cycles_t cycles;

		long jiffies;

		long jiffies;

		unsigned cycles;

		unsigned num;

		unsigned num;

	} sample;

	} sample;

	long delta, delta2, delta3;

	long delta, delta2, delta3;
@@ -637,7 +637,11 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) 
		goto out;

		goto out;





	sample.jiffies = jiffies;

	sample.jiffies = jiffies;



	/* Use arch random value, fall back to cycles */

	if (!arch_get_random_int(&sample.cycles))

		sample.cycles = get_cycles();

		sample.cycles = get_cycles();



	sample.num = num;

	sample.num = num;

	mix_pool_bytes(&input_pool, &sample, sizeof(sample));

	mix_pool_bytes(&input_pool, &sample, sizeof(sample));