linux-kernel - [PATCH] x86_64: not clear empty_zero

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Message-id: <200801021741.26217.yinghai.lu@sun.com>
Date:	Wed, 02 Jan 2008 17:41:25 -0800
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86_64: not clear empty_zero_page again

[PATCH] x86_64: not clear empty_zero_page again

empty_zero_page is in .bss section, and it is cleared in clear_bss by x86_64_start_kernel. So don't clear that again in mem_init

Signed-off-by: Yinghai Lu <yinghai.lu@....com>

Index: linux-2.6/arch/x86/mm/init_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_64.c
+++ linux-2.6/arch/x86/mm/init_64.c
@@ -521,8 +521,7 @@ void __init mem_init(void)
 
 	pci_iommu_alloc();
 
-	/* clear the zero-page */
-	memset(empty_zero_page, 0, PAGE_SIZE);
+	/* clear_bss() already clear the empty_zero_page */
 
 	reservedpages = 0;
 
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