Fix the x86_64 implementation of call_rwsem_wait()
authorDavid Howells <dhowells@redhat.com>
Tue, 4 May 2010 12:42:53 +0000 (13:42 +0100)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 4 May 2010 22:24:14 +0000 (15:24 -0700)
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>
arch/x86/lib/rwsem_64.S

index 15acecf0d7aa0c4768493d79dedfdf518a647707..41fcf00e49dfc7ca9549ce5e4dd26f360ee81353 100644 (file)
@@ -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