linux-kernel - [PATCH] Remove 'volatile' from spinlock

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Message-ID: <20061206204553.GC3107@artsapartment.org>
Date:	Wed, 6 Dec 2006 14:45:53 -0600
From:	"Art Haas" <ahaas@...mail.net>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...l.org>, Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] Remove 'volatile' from spinlock_types

Hi.

This is a resubmission of patches originally created by Ingo Molnar.
The link below is the initial (?) posting of the patch.

http://marc.theaimsgroup.com/?l=linux-kernel&m=115217423929806&w=2

Remove 'volatile' from spinlock_types as it causes GCC to generate
bad code (see link) and locking should be used on kernel data.

Signed-off-by: Art Haas <ahaas@...mail.net>
---
diff --git a/include/asm-i386/spinlock_types.h b/include/asm-i386/spinlock_types.h
index 59efe84..4da9345 100644
--- a/include/asm-i386/spinlock_types.h
+++ b/include/asm-i386/spinlock_types.h
@@ -6,13 +6,13 @@
 #endif
 
 typedef struct {
-	volatile unsigned int slock;
+	unsigned int slock;
 } raw_spinlock_t;
 
 #define __RAW_SPIN_LOCK_UNLOCKED	{ 1 }
 
 typedef struct {
-	volatile unsigned int lock;
+	unsigned int lock;
 } raw_rwlock_t;
 
 #define __RAW_RW_LOCK_UNLOCKED		{ RW_LOCK_BIAS }
diff --git a/include/asm-x86_64/spinlock_types.h b/include/asm-x86_64/spinlock_types.h
index 59efe84..4da9345 100644
--- a/include/asm-x86_64/spinlock_types.h
+++ b/include/asm-x86_64/spinlock_types.h
@@ -6,13 +6,13 @@
 #endif
 
 typedef struct {
-	volatile unsigned int slock;
+	unsigned int slock;
 } raw_spinlock_t;
 
 #define __RAW_SPIN_LOCK_UNLOCKED	{ 1 }
 
 typedef struct {
-	volatile unsigned int lock;
+	unsigned int lock;
 } raw_rwlock_t;
 
 #define __RAW_RW_LOCK_UNLOCKED		{ RW_LOCK_BIAS }
-- 
Man once surrendering his reason, has no remaining guard against absurdities
the most monstrous, and like a ship without rudder, is the sport of every wind.

-Thomas Jefferson to James Smith, 1822
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