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authorMikulas Patocka <mpatocka@redhat.com>2015-10-02 18:21:24 +0300
committerMike Snitzer <snitzer@redhat.com>2015-11-01 02:06:01 +0300
commita3d939ae7b5f82688a6d3450f95286eaea338328 (patch)
tree175d7f596c4c1a478a39cbee4a4a375fee459bf0 /drivers/md/dm-snap-persistent.c
parent6f65985e2636c0b170eade6a72d216632f065e26 (diff)
downloadlinux-a3d939ae7b5f82688a6d3450f95286eaea338328.tar.xz
dm: convert ffs to __ffs
ffs counts bit starting with 1 (for the least significant bit), __ffs counts bits starting with 0. This patch changes various occurrences of ffs to __ffs and removes subtraction of 1 from the result. Note that __ffs (unlike ffs) is not defined when called with zero argument, but it is not called with zero argument in any of these cases. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-snap-persistent.c')
-rw-r--r--drivers/md/dm-snap-persistent.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index bf71583296f7..046f6b81e6e6 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -321,7 +321,7 @@ static int read_header(struct pstore *ps, int *new_snapshot)
bdev_logical_block_size(dm_snap_cow(ps->store->snap)->
bdev) >> 9);
ps->store->chunk_mask = ps->store->chunk_size - 1;
- ps->store->chunk_shift = ffs(ps->store->chunk_size) - 1;
+ ps->store->chunk_shift = __ffs(ps->store->chunk_size);
chunk_size_supplied = 0;
}