linux-kernel - Re: [PATCH] [8/45] x86_64: Use string instruction memcpy on AMD Fam11h

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Date:	Sat, 22 Sep 2007 11:29:55 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Andi Kleen <ak@...e.de>
cc:	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [8/45] x86_64: Use string instruction memcpy on AMD
 Fam11h


On Sep 21 2007 22:44, Andi Kleen wrote:
>Subject: [PATCH] [8/45] x86_64: Use string instruction memcpy on AMD Fam11h
>
>--- linux.orig/arch/x86_64/kernel/setup.c
>+++ linux/arch/x86_64/kernel/setup.c
>@@ -575,7 +575,7 @@ static void __cpuinit init_amd(struct cp
> 	level = cpuid_eax(1);
> 	if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58))
> 		set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
>-	if (c->x86 == 0x10)
>+	if (c->x86 == 0x10 || c->x86 == 0x11)
> 		set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);

Perhaps it can be assumed that all future CPU versions have this and
	if (c->x86 >= 0x10)
could be used?

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