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authorDavid Chinner <dgc@sgi.com>2007-11-23 16:27:59 +1100
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-02-07 18:14:22 +1100
commita69b176df246d59626e6a9c640b44c0921fa4566 (patch)
treeef763ee32c95da88b4aa119d084d5f022e8e0477 /fs/xfs/xfs_bit.h
parentc319b58b13bb22f9a2478825b06c641c825f51ec (diff)
[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 <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_bit.h')
-rw-r--r--fs/xfs/xfs_bit.h27
1 files changed, 22 insertions, 5 deletions
diff --git a/fs/xfs/xfs_bit.h b/fs/xfs/xfs_bit.h
index 082641a9782c..0f9fc9a3c415 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);