linux-kernel - K8, EFFICEON and CORE2 support the cmovxx instructions.

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Message-ID: <20080315191946.GA21817@mailshack.com>
Date:	Sat, 15 Mar 2008 20:19:46 +0100
From:	Alexander van Heukelum <heukelum@...lshack.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	LKML <linux-kernel@...r.kernel.org>
Subject: K8, EFFICEON and CORE2 support the cmovxx instructions.

K8, EFFICEON and CORE2 support the cmovxx instructions.

Instead of listing the cpu's that have support for the
cmovxx instructions, list the cpu's that don't.

Signed-off-by: Alexander van Heukelum <heukelum@...tmail.fm>
---

A bit of playing resulted in:

CPUS="M386 M486 M586 M586TSC M586MMX M686 MPENTIUMII MPENTIUMIII"
CPUS=$CPUS" MPENTIUMM MPENTIUM4 MK6 MK7 MK8 MCRUSOE MEFFICEON"
CPUS=$CPUS" MWINCHIPC6 MWINCHIP2 MWINCHIP3D MGEODEGX1 MGEODE_LX"
CPUS=$CPUS" MCYRIXIII MVIAC3_2 MVIAC7 MPSC MCORE2"

for cpu in $CPUS
do
        echo "CONFIG_${cpu}=y" > testconfig
        make ARCH=i386 allnoconfig KCONFIG_ALLCONFIG=testconfig > /dev/null
        echo ${cpu} >> result
        grep X86_CMOV .config >> result
        echo >> result
done

I'm quite sure that K8, EFFICEON and CORE2 support HAVE_CMOV, but
they did not set X86_CMOV.

Greetings,
	Alexander van Heukelum

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 31e92fb..7a3a2d4 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -399,7 +399,7 @@ config X86_TSC
 # generates cmov.
 config X86_CMOV
 	def_bool y
-	depends on (MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7)
+	depends on !(MCYRIXIII || MGEODE_LX || MGEODEGX1 || MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MK6 || M586MMX || M586TSC || M586 || M486 || M386)
 
 config X86_MINIMUM_CPU_FAMILY
 	int

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