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authorMikulas Patocka <mpatocka@redhat.com>2015-10-02 11:21:24 -0400
committerMike Snitzer <snitzer@redhat.com>2015-10-31 19:06:01 -0400
commita3d939ae7b5f82688a6d3450f95286eaea338328 (patch)
tree175d7f596c4c1a478a39cbee4a4a375fee459bf0 /drivers/md/dm-bufio.c
parent6f65985e2636c0b170eade6a72d216632f065e26 (diff)
downloadlinux-a3d939ae7b5f82688a6d3450f95286eaea338328.tar.bz2
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-bufio.c')
-rw-r--r--drivers/md/dm-bufio.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index e1547d0dadfd..2dd33085b331 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1598,11 +1598,11 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
c->bdev = bdev;
c->block_size = block_size;
- c->sectors_per_block_bits = ffs(block_size) - 1 - SECTOR_SHIFT;
- c->pages_per_block_bits = (ffs(block_size) - 1 >= PAGE_SHIFT) ?
- ffs(block_size) - 1 - PAGE_SHIFT : 0;
- c->blocks_per_page_bits = (ffs(block_size) - 1 < PAGE_SHIFT ?
- PAGE_SHIFT - (ffs(block_size) - 1) : 0);
+ c->sectors_per_block_bits = __ffs(block_size) - SECTOR_SHIFT;
+ c->pages_per_block_bits = (__ffs(block_size) >= PAGE_SHIFT) ?
+ __ffs(block_size) - PAGE_SHIFT : 0;
+ c->blocks_per_page_bits = (__ffs(block_size) < PAGE_SHIFT ?
+ PAGE_SHIFT - __ffs(block_size) : 0);
c->aux_size = aux_size;
c->alloc_callback = alloc_callback;