[Patch] xfs_lowbit64 broken on ia32

[David Chinner <dgc@sgi.com>]

The recent change to the internals of xfs_lowbit64 broke it on
ia32 - the code treats the 64bit value as an unsigned long
which is only 32 bits on ia32 and hence throws away the high 32
bits. 64 bit platforms are not affected.

Tested with a userspace implementation comparing the original
code with the new code.

Signed-off-by: Dave Chinner <dgc@sgi.com>
---
 fs/xfs/xfs_bit.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: 2.6.x-xfs-new/fs/xfs/xfs_bit.h
===================================================================
--- 2.6.x-xfs-new.orig/fs/xfs/xfs_bit.h	2007-11-02 13:44:45.000000000 +1100
+++ 2.6.x-xfs-new/fs/xfs/xfs_bit.h	2007-12-03 14:43:33.169851481 +1100
@@ -68,8 +68,8 @@ static inline int xfs_lowbit32(__uint32_
 /* 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;
+	unsigned long long	t = v;
+	return (v) ? find_first_bit((unsigned long *)&t, 64) : -1;
 }
 
 /* Return whether bitmap is empty (1 == empty) */