lkml.org 
[lkml]   [2010]   [May]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] Fix the x86_64 implementation of call_rwsem_wait()
Date
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>
---

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 15acecf..41fcf00 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)
ENDPROC(call_rwsem_down_write_failed)

ENTRY(call_rwsem_wake)
- decw %dx /* do nothing if still outstanding active readers */
+ decl %edx /* do nothing if still outstanding active readers */
jnz 1f
save_common_regs
movq %rax,%rdi


\
 
 \ /
  Last update: 2010-05-04 14:45    [W:0.042 / U:11.544 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site