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md/raid5: Don't read ->active_stripes if it's not needed 

The atomic_read() is not needed in many cases so only do
the read after the first checks are done.

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Logan Gunthorpe 2022-08-11 11:14:17 -06:00 committed by Song Liu
parent 2f2d51efd8
commit f9287c3e93
1 changed files with 2 additions and 3 deletions
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5
drivers/md/raid5.c
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@ -789,15 +789,14 @@ struct stripe_request_ctx {
*/
static bool is_inactive_blocked(struct r5conf *conf, int hash)
{
int active = atomic_read(&conf->active_stripes);
if (list_empty(conf->inactive_list + hash))
return false;
if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state))
return true;
return active < (conf->max_nr_stripes * 3 / 4);
return (atomic_read(&conf->active_stripes) <
(conf->max_nr_stripes * 3 / 4));
}
struct stripe_head *raid5_get_active_stripe(struct r5conf *conf,