From a69b176df246d59626e6a9c640b44c0921fa4566 Mon Sep 17 00:00:00 2001 From: David Chinner Date: Fri, 23 Nov 2007 16:27:59 +1100 Subject: [XFS] Use the generic bitops rather than implementing them ourselves. Patch inspired by Andi Kleen. SGI-PV: 971186 SGI-Modid: xfs-linux-melb:xfs-kern:30000a Signed-off-by: David Chinner Signed-off-by: Christoph Hellwig Signed-off-by: Lachlan McIlroy --- fs/xfs/xfs_bit.h | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) (limited to 'fs/xfs/xfs_bit.h') diff --git a/fs/xfs/xfs_bit.h b/fs/xfs/xfs_bit.h index 082641a..0f9fc9a 100644 --- a/fs/xfs/xfs_bit.h +++ b/fs/xfs/xfs_bit.h @@ -47,13 +47,30 @@ static inline __uint64_t xfs_mask64lo(int n) } /* Get high bit set out of 32-bit argument, -1 if none set */ -extern int xfs_highbit32(__uint32_t v); - -/* Get low bit set out of 64-bit argument, -1 if none set */ -extern int xfs_lowbit64(__uint64_t v); +static inline int xfs_highbit32(__uint32_t v) +{ + return fls(v) - 1; +} /* Get high bit set out of 64-bit argument, -1 if none set */ -extern int xfs_highbit64(__uint64_t); +static inline int xfs_highbit64(__uint64_t v) +{ + return fls64(v) - 1; +} + +/* Get low bit set out of 32-bit argument, -1 if none set */ +static inline int xfs_lowbit32(__uint32_t v) +{ + unsigned long t = v; + return (v) ? find_first_bit(&t, 32) : -1; +} + +/* Get low bit set out of 64-bit argument, -1 if none set */ +static inline int xfs_lowbit64(__uint64_t v) +{ + unsigned long t = v; + return (v) ? find_first_bit(&t, 64) : -1; +} /* Return whether bitmap is empty (1 == empty) */ extern int xfs_bitmap_empty(uint *map, uint size); -- cgit v1.1