linux-kernel - Re: [git pull] "big box" x86 changes, boot protocol

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Date:	Sat, 26 Apr 2008 23:17:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai.lu@....com>,
	Yinghai Lu <yhlu.kernel@...il.com>, jbarnes@...tuousgeek.org
Subject: Re: [git pull] "big box" x86 changes, boot protocol


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > We always use the gcc builtin for memcpy() here.
> 
> It's probably hard to write a reasonable x86 memcpy() that wouldn't 
> happen to do the right thing for this case, but I do agee - we should 
> still use memmove() for this, just to make it clear that it does 
> overlapping things.

agreed, i queued up the patch below.

	Ingo

------------->
Subject: bootprotocol: cleanup
From: Ingo Molnar <mingo@...e.hu>
Date: Sat Apr 26 23:14:36 CEST 2008

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/e820_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-x86.q/arch/x86/kernel/e820_64.c
===================================================================
--- linux-x86.q.orig/arch/x86/kernel/e820_64.c
+++ linux-x86.q/arch/x86/kernel/e820_64.c
@@ -100,7 +100,7 @@ void __init free_early(unsigned long sta
 	for (j = i + 1; j < MAX_EARLY_RES && early_res[j].end; j++)
 		;
 
-	memcpy(&early_res[i], &early_res[i + 1],
+	memmove(&early_res[i], &early_res[i + 1],
 	       (j - 1 - i) * sizeof(struct early_res));
 
 	early_res[j - 1].end = 0;
--
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