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    Subject[PATCH 3.16.y-ckt 10/94] dm raid: fix round up of default region size
    Date
    3.16.7-ckt20 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Mikulas Patocka <mpatocka@redhat.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@redhat.com>
    Fixes: 3a0f9aaee028 ("dm raid: round region_size to power of two")
    Signed-off-by: Mike Snitzer <snitzer@redhat.com>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    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 {

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