Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a22fb7ff1259e6ee87d0ba3559c9f7b7d0cb20d2
Commit: a22fb7ff1259e6ee87d0ba3559c9f7b7d0cb20d2
Parent: 03513bccad33667ed738cfd96dc5757e539e0bdb
Author: Martin Schwidefsky <[EMAIL PROTECTED]>
AuthorDate: Tue Feb 19 15:29:28 2008 +0100
Committer: Martin Schwidefsky <[EMAIL PROTECTED]>
CommitDate: Tue Feb 19 15:29:33 2008 +0100
[S390] find bit corner case.
Fix [ext2_]find_first_[zero_]bit for the corner case of an all clear
or all set bit field by always handling that last word of the bit field
with __ffz_word/__ffs_word.
Signed-off-by: Martin Schwidefsky <[EMAIL PROTECTED]>
---
include/asm-s390/bitops.h | 20 ++++++++++++--------
1 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/include/asm-s390/bitops.h b/include/asm-s390/bitops.h
index ab83c84..965394e 100644
--- a/include/asm-s390/bitops.h
+++ b/include/asm-s390/bitops.h
@@ -456,16 +456,18 @@ static inline unsigned long __ffz_word_loop(const
unsigned long *addr,
asm volatile(
#ifndef __s390x__
- " ahi %1,31\n"
- " srl %1,5\n"
+ " ahi %1,-1\n"
+ " sra %1,5\n"
+ " jz 1f\n"
"0: c %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,4(%0)\n"
" brct %1,0b\n"
"1:\n"
#else
- " aghi %1,63\n"
- " srlg %1,%1,6\n"
+ " aghi %1,-1\n"
+ " srag %1,%1,6\n"
+ " jz 1f\n"
"0: cg %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,8(%0)\n"
@@ -491,16 +493,18 @@ static inline unsigned long __ffs_word_loop(const
unsigned long *addr,
asm volatile(
#ifndef __s390x__
- " ahi %1,31\n"
- " srl %1,5\n"
+ " ahi %1,-1\n"
+ " sra %1,5\n"
+ " jz 1f\n"
"0: c %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,4(%0)\n"
" brct %1,0b\n"
"1:\n"
#else
- " aghi %1,63\n"
- " srlg %1,%1,6\n"
+ " aghi %1,-1\n"
+ " srag %1,%1,6\n"
+ " jz 1f\n"
"0: cg %2,0(%0,%3)\n"
" jne 1f\n"
" la %0,8(%0)\n"
-
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