Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ef8ece55d9b6825c28a5c1a4bd89b94040cb7b32
Commit: ef8ece55d9b6825c28a5c1a4bd89b94040cb7b32
Parent: db69c915e67705daac25cad06d816c09be634de0
Author: Lachlan McIlroy [EMAIL PROTECTED]
AuthorDate: Tue Feb 26 17:00:22 2008 +1100
Committer: Lachlan McIlroy [EMAIL PROTECTED]
CommitDate: Tue Feb 26 17:05:44 2008 +1100
[XFS] Undo bit ops cleanup mod due to regression on 32-bit powermac
platform.
SGI-PV: 971186
SGI-Modid: xfs-linux-melb:xfs-kern:30559a
Signed-off-by: Lachlan McIlroy [EMAIL PROTECTED]
---
fs/xfs/xfs_bit.c | 103 ++
fs/xfs/xfs_bit.h | 27 ++---
fs/xfs/xfs_rtalloc.c | 19 ++---
3 files changed, 120 insertions(+), 29 deletions(-)
diff --git a/fs/xfs/xfs_bit.c b/fs/xfs/xfs_bit.c
index 4822884..fab0b6d 100644
--- a/fs/xfs/xfs_bit.c
+++ b/fs/xfs/xfs_bit.c
@@ -25,6 +25,109 @@
* 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 0x)
+ if (v 0xff00)
+ i = 24;
+ else
+ i = 16;
+ else if (v 0x)
+ if (v 0xff00)
+ 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
diff --git a/fs/xfs/xfs_bit.h b/fs/xfs/xfs_bit.h
index 0f9fc9a..082641a 100644
--- a/fs/xfs/xfs_bit.h
+++ b/fs/xfs/xfs_bit.h
@@ -47,30 +47,13 @@ static inline __uint64_t xfs_mask64lo(int n)
}
/* Get high bit set out of 32-bit
