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dm: convert ffs to __ffs

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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>
This commit is contained in:
Mikulas Patocka
2015-10-02 11:21:24 -04:00
committed by Mike Snitzer
parent 6f65985e26
commit a3d939ae7b
7 changed files with 11 additions and 11 deletions
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2
drivers/md/dm-snap-persistent.c
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@@ -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;
}