linux-kernel - [PATCH] [34/45] i386: no need to make enable_cpu

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Message-Id: <20070921204517.0BA6214EFF@wotan.suse.de>
Date:	Fri, 21 Sep 2007 22:45:16 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	bunk@...sta.de, ak@...e.de, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [34/45] i386: no need to make enable_cpu_hotplug a variable


From: Adrian Bunk <bunk@...sta.de>

As long as there's no write access to this variable there's no reason to let
gcc check it at runtime.

Signed-off-by: Adrian Bunk <bunk@...sta.de>
Signed-off-by: Andi Kleen <ak@...e.de>
Cc: Andi Kleen <ak@...e.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 arch/i386/kernel/topology.c |    2 --
 include/asm-i386/cpu.h      |    2 +-
 2 files changed, 1 insertion(+), 3 deletions(-)

Index: linux/arch/i386/kernel/topology.c
===================================================================
--- linux.orig/arch/i386/kernel/topology.c
+++ linux/arch/i386/kernel/topology.c
@@ -51,8 +51,6 @@ int arch_register_cpu(int num)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-int enable_cpu_hotplug = 1;
-
 void arch_unregister_cpu(int num) {
 	return unregister_cpu(&cpu_devices[num].cpu);
 }
Index: linux/include/asm-i386/cpu.h
===================================================================
--- linux.orig/include/asm-i386/cpu.h
+++ linux/include/asm-i386/cpu.h
@@ -13,7 +13,7 @@ struct i386_cpu {
 extern int arch_register_cpu(int num);
 #ifdef CONFIG_HOTPLUG_CPU
 extern void arch_unregister_cpu(int);
-extern int enable_cpu_hotplug;
+#define enable_cpu_hotplug	1
 #else
 #define enable_cpu_hotplug	0
 #endif
-
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