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Date: Sat, 17 Oct 2015 19:05:24 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>, Mike Snitzer <snitzer@...hat.com> Subject: [PATCH 3.10 20/54] dm raid: fix round up of default region size 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikulas Patocka <mpatocka@...hat.com> 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 <mpatocka@...hat.com> Fixes: 3a0f9aaee028 ("dm raid: round region_size to power of two") Signed-off-by: Mike Snitzer <snitzer@...hat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/md/dm-raid.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -325,8 +325,7 @@ static int validate_region_size(struct r */ 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 { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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