[XFS] Use the generic bitops rather than implementing them ourselves.

This keeps xfs_lowbit64 as it was since there aren't good generic helpers
there ... Patch inspired by Andi Kleen.

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31472a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 0 insertions, 103 deletions

diff --git a/fs/xfs/xfs_bit.c b/fs/xfs/xfs_bit.c
index fab0b6d5a41b..48228848f5ae 100644
--- a/fs/xfs/xfs_bit.c
+++ b/fs/xfs/xfs_bit.c
@@ -25,109 +25,6 @@
  * XFS bit manipulation routines, used in non-realtime code.
  */
 
-#ifndef HAVE_ARCH_HIGHBIT
-/*
- * Index of high bit number in byte, -1 for none set, 0..7 otherwise.
- */
-static const char xfs_highbit[256] = {
-       -1, 0, 1, 1, 2, 2, 2, 2,                 /* 00 .. 07 */
-        3, 3, 3, 3, 3, 3, 3, 3,                 /* 08 .. 0f */
-        4, 4, 4, 4, 4, 4, 4, 4,                 /* 10 .. 17 */
-        4, 4, 4, 4, 4, 4, 4, 4,                 /* 18 .. 1f */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 20 .. 27 */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 28 .. 2f */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 30 .. 37 */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 38 .. 3f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 40 .. 47 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 48 .. 4f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 50 .. 57 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 58 .. 5f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 60 .. 67 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 68 .. 6f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 70 .. 77 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 78 .. 7f */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 80 .. 87 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 88 .. 8f */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 90 .. 97 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 98 .. 9f */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* a0 .. a7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* a8 .. af */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* b0 .. b7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* b8 .. bf */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* c0 .. c7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* c8 .. cf */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* d0 .. d7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* d8 .. df */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* e0 .. e7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* e8 .. ef */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* f0 .. f7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* f8 .. ff */
-};
-#endif
-
-/*
- * xfs_highbit32: get high bit set out of 32-bit argument, -1 if none set.
- */
-inline int
-xfs_highbit32(
-        __uint32_t      v)
-{
-#ifdef HAVE_ARCH_HIGHBIT
-        return highbit32(v);
-#else
-        int             i;
-
-        if (v & 0xffff0000)
-                if (v & 0xff000000)
-                        i = 24;
-                else
-                        i = 16;
-        else if (v & 0x0000ffff)
-                if (v & 0x0000ff00)
-                        i = 8;
-                else
-                        i = 0;
-        else
-                return -1;
-        return i + xfs_highbit[(v >> i) & 0xff];
-#endif
-}
-
-/*
- * xfs_lowbit64: get low bit set out of 64-bit argument, -1 if none set.
- */
-int
-xfs_lowbit64(
-        __uint64_t      v)
-{
-        __uint32_t      w = (__uint32_t)v;
-        int             n = 0;
-
-        if (w) {        /* lower bits */
-                n = ffs(w);
-        } else {        /* upper bits */
-                w = (__uint32_t)(v >> 32);
-                if (w && (n = ffs(w)))
-                        n += 32;
-        }
-        return n - 1;
-}
-
-/*
- * xfs_highbit64: get high bit set out of 64-bit argument, -1 if none set.
- */
-int
-xfs_highbit64(
-        __uint64_t      v)
-{
-        __uint32_t      h = (__uint32_t)(v >> 32);
-
-        if (h)
-                return xfs_highbit32(h) + 32;
-        return xfs_highbit32((__uint32_t)v);
-}
-
-
 /*
  * Return whether bitmap is empty.
  * Size is number of words in the bitmap, which is padded to word boundary