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Commit 6a328475 authored by Jim Kukunas's avatar Jim Kukunas Committed by NeilBrown
Browse files

crypto: wait for a full jiffy in do_xor_speed 



In the existing do_xor_speed(), there is no guarantee that we actually
run do_2() for a full jiffy. We get the current jiffy, then run do_2()
until the next jiffy.

Instead, let's get the current jiffy, then wait until the next jiffy
to start our test.

Signed-off-by: default avatarJim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 3ea7daa5

crypto/xor.c

+5 −3
Original line number Diff line number Diff line
@@ -63,7 +63,7 @@ static void 
do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)

{

	int speed;

	unsigned long now;

	unsigned long now, j;

	int i, count, max;



	tmpl->next = template_list;
@@ -76,9 +76,11 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2) 
	 */

	max = 0;

	for (i = 0; i < 5; i++) {

		now = jiffies;

		j = jiffies;

		count = 0;

		while (jiffies == now) {

		while ((now = jiffies) == j)

			cpu_relax();

		while (time_before(jiffies, now + 1)) {

			mb(); /* prevent loop optimzation */

			tmpl->do_2(BENCH_SIZE, b1, b2);

			mb();