From 90432e600619cbd3f38ec817374a5db0caf1d600 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Mon, 22 Mar 2021 10:05:05 -0400 Subject: [PATCH] buffer: a small optimization in grow_buffers This patch replaces a loop with a "tzcnt" instruction. Signed-off-by: Mikulas Patocka Signed-off-by: Al Viro --- fs/buffer.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index 0cb7ffd4977c9..c2e052c0fc5d6 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1020,11 +1020,7 @@ grow_buffers(struct block_device *bdev, sector_t block, int size, gfp_t gfp) pgoff_t index; int sizebits; - sizebits = -1; - do { - sizebits++; - } while ((size << sizebits) < PAGE_SIZE); - + sizebits = PAGE_SHIFT - __ffs(size); index = block >> sizebits; /* -- 2.30.2