From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Mikulas Patocka , Mike Snitzer , Luis Henriques Subject: [PATCH 3.16.y-ckt 10/94] dm raid: fix round up of default region size Date: Fri, 13 Nov 2015 10:09:04 +0000 Message-Id: <1447409428-12178-11-git-send-email-luis.henriques@canonical.com> In-Reply-To: <1447409428-12178-1-git-send-email-luis.henriques@canonical.com> References: <1447409428-12178-1-git-send-email-luis.henriques@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.16.7-ckt20 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikulas Patocka commit 042745ee53a0a7c1f5aff191a4a24213c6dcfb52 upstream. Commit 3a0f9aaee028 ("dm raid: round region_size to power of two") intended to make sure that the default region size is a power of two. However, the logic in that commit is incorrect and sets the variable region_size to 0 or 1, depending on whether min_region_size is a power of two. Fix this logic, using roundup_pow_of_two(), so that region_size is properly rounded up to the next power of two. Signed-off-by: Mikulas Patocka Fixes: 3a0f9aaee028 ("dm raid: round region_size to power of two") Signed-off-by: Mike Snitzer Signed-off-by: Luis Henriques --- drivers/md/dm-raid.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 59715389b3cf..19cfd7affebe 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -325,8 +325,7 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size) */ if (min_region_size > (1 << 13)) { /* If not a power of 2, make it the next power of 2 */ - if (min_region_size & (min_region_size - 1)) - region_size = 1 << fls(region_size); + region_size = roundup_pow_of_two(min_region_size); DMINFO("Choosing default region size of %lu sectors", region_size); } else {