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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>
This commit is contained in:
David Howells 2010-05-04 13:42:53 +01:00 committed by Linus Torvalds
parent c81406d642
commit a66f6375bd
1 changed files with 1 additions and 1 deletions
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2
arch/x86/lib/rwsem_64.S
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@ -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