diff options
Diffstat (limited to 'fs/xfs/xfs_bit.h')
| -rw-r--r-- | fs/xfs/xfs_bit.h | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/fs/xfs/xfs_bit.h b/fs/xfs/xfs_bit.h index 8e0e463dae2..e1649c0d3e0 100644 --- a/fs/xfs/xfs_bit.h +++ b/fs/xfs/xfs_bit.h @@ -23,24 +23,16 @@ */ /* - * masks with n high/low bits set, 32-bit values & 64-bit values + * masks with n high/low bits set, 64-bit values */ -#define XFS_MASK32HI(n) xfs_mask32hi(n) -static inline __uint32_t xfs_mask32hi(int n) -{ - return (__uint32_t)-1 << (32 - (n)); -} -#define XFS_MASK64HI(n) xfs_mask64hi(n) static inline __uint64_t xfs_mask64hi(int n) { return (__uint64_t)-1 << (64 - (n)); } -#define XFS_MASK32LO(n) xfs_mask32lo(n) static inline __uint32_t xfs_mask32lo(int n) { return ((__uint32_t)1 << (n)) - 1; } -#define XFS_MASK64LO(n) xfs_mask64lo(n) static inline __uint64_t xfs_mask64lo(int n) { return ((__uint64_t)1 << (n)) - 1; @@ -61,8 +53,7 @@ static inline int xfs_highbit64(__uint64_t v) /* 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; + return ffs(v) - 1; } /* Get low bit set out of 64-bit argument, -1 if none set */ @@ -75,8 +66,11 @@ static inline int xfs_lowbit64(__uint64_t v) n = ffs(w); } else { /* upper bits */ w = (__uint32_t)(v >> 32); - if (w && (n = ffs(w))) - n += 32; + if (w) { + n = ffs(w); + if (n) + n += 32; + } } return n - 1; } |