linux-kernel - [PATCH 1/3] x86: ticket spin locks: fix asm constraints

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Message-Id: <48C1419F.76E4.0078.0@novell.com>
Date:	Fri, 05 Sep 2008 13:26:39 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>, <hpa@...or.com>
Cc:	"Nick Piggin" <npiggin@...e.de>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] x86: ticket spin locks: fix asm constraints

In addition to these changes I doubt the 'volatile' on all the ticket
lock asm()-s are really necessary.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Nick Piggin <npiggin@...e.de>

---
 include/asm-x86/spinlock.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-x86.orig/include/asm-x86/spinlock.h
+++ linux-x86/include/asm-x86/spinlock.h
@@ -101,7 +101,7 @@ static __always_inline int __ticket_spin
 		     "1:"
 		     "sete %b1\n\t"
 		     "movzbl %b1,%0\n\t"
-		     : "=&a" (tmp), "=Q" (new), "+m" (lock->slock)
+		     : "=&a" (tmp), "=&Q" (new), "+m" (lock->slock)
 		     :
 		     : "memory", "cc");
 
@@ -146,7 +146,7 @@ static __always_inline void __ticket_spi
 		     /* don't need lfence here, because loads are in-order */
 		     "jmp 1b\n"
 		     "2:"
-		     : "+Q" (inc), "+m" (lock->slock), "=r" (tmp)
+		     : "+r" (inc), "+m" (lock->slock), "=&r" (tmp)
 		     :
 		     : "memory", "cc");
 }
@@ -166,7 +166,7 @@ static __always_inline int __ticket_spin
 		     "1:"
 		     "sete %b1\n\t"
 		     "movzbl %b1,%0\n\t"
-		     : "=&a" (tmp), "=r" (new), "+m" (lock->slock)
+		     : "=&a" (tmp), "=&q" (new), "+m" (lock->slock)
 		     :
 		     : "memory", "cc");
 



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