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>

diff --git a/arch/x86/lib/rwsem_64.S b/arch/x86/lib/rwsem_64.S
index 15acecf..41fcf00 100644 (file)
--- 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