diff options
| author | David Howells <dhowells@redhat.com> | 2010-05-04 08:42:53 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-04 18:24:14 -0400 |
| commit | a66f6375bdeb64d7a56c532bda7c006358845820 (patch) | |
| tree | 2d42106075f70f23d12485edfdc4aba537187dcb /arch | |
| parent | c81406d6423416f1e18a8a41a3b7ac415fdf13d3 (diff) | |
Fix the x86_64 implementation of call_rwsem_wait()
The x86_64 call_rwsem_wait() treats the active state counter part of the
R/W semaphore state as being 16-bit when it's actually 32-bit (it's half
of the 64-bit state). It should do "decl %edx" not "decw %dx".
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/lib/rwsem_64.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/lib/rwsem_64.S b/arch/x86/lib/rwsem_64.S index 15acecf0d7aa..41fcf00e49df 100644 --- a/arch/x86/lib/rwsem_64.S +++ b/arch/x86/lib/rwsem_64.S | |||
| @@ -60,7 +60,7 @@ ENTRY(call_rwsem_down_write_failed) | |||
| 60 | ENDPROC(call_rwsem_down_write_failed) | 60 | ENDPROC(call_rwsem_down_write_failed) |
| 61 | 61 | ||
| 62 | ENTRY(call_rwsem_wake) | 62 | ENTRY(call_rwsem_wake) |
| 63 | decw %dx /* do nothing if still outstanding active readers */ | 63 | decl %edx /* do nothing if still outstanding active readers */ |
| 64 | jnz 1f | 64 | jnz 1f |
| 65 | save_common_regs | 65 | save_common_regs |
| 66 | movq %rax,%rdi | 66 | movq %rax,%rdi |