linux-kernel - [PATCH 8/25] [PATCH] use macro for sti/cli in spinlock definitions

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Date:	Wed,  8 Aug 2007 01:18:55 -0300
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, rusty@...tcorp.com.au, ak@...e.de,
	mingo@...e.hu, chrisw@...s-sol.org, jeremy@...p.org,
	avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, lguest@...abs.org,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 8/25] [PATCH] use macro for sti/cli in spinlock definitions

This patch switches the cli and sti instructions into macros.
In this header, they're just defined to the instructions they
refer to. Later on, when paravirt is defined, they will be
defined to something with paravirt abilities.

Signed-off-by: Glauber de Oliveira Costa <gcosta@...hat.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 include/asm-x86_64/spinlock.h |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/include/asm-x86_64/spinlock.h b/include/asm-x86_64/spinlock.h
index 88bf981..a81e27a 100644
--- a/include/asm-x86_64/spinlock.h
+++ b/include/asm-x86_64/spinlock.h
@@ -5,6 +5,14 @@
 #include <asm/rwlock.h>
 #include <asm/page.h>
 #include <asm/processor.h>
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define CLI_STI_INPUT_ARGS
+#define CLI_STI_CLOBBERS
+#define CLI_STRING "cli"
+#define STI_STRING "sti"
+#endif
 
 /*
  * Your basic SMP spinlocks, allowing only a single CPU anywhere
@@ -48,12 +56,12 @@ static inline void __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long fla
 		"jns 5f\n"
 		"testl $0x200, %1\n\t"	/* interrupts were disabled? */
 		"jz 4f\n\t"
-	        "sti\n"
+		STI_STRING "\n\t"
 		"3:\t"
 		"rep;nop\n\t"
 		"cmpl $0, %0\n\t"
 		"jle 3b\n\t"
-		"cli\n\t"
+		CLI_STRING "\n\t"
 		"jmp 1b\n"
 		"4:\t"
 		"rep;nop\n\t"
@@ -61,7 +69,9 @@ static inline void __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long fla
 		"jg 1b\n\t"
 		"jmp 4b\n"
 		"5:\n\t"
-		: "+m" (lock->slock) : "r" ((unsigned)flags) : "memory");
+		: "+m" (lock->slock)
+		: "r" ((unsigned)flags), CLI_STI_INPUT_ARGS
+		: "memory", CLI_STI_CLOBBERS);
 }
 #endif
 
-- 
1.4.4.2

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