From: Roland McGrath <roland@redhat.com>
Date: Wed, 30 Jan 2008 12:30:54 +0000 (+0100)
Subject: x86: debugctlmsr kconfig
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0a049bb0ab807b4a95dce9cd0b603c01c199a287;p=linux-beck.git

x86: debugctlmsr kconfig

This adds the (internal) Kconfig macro CONFIG_X86_DEBUGCTLMSR,
to be defined when configuring to support only hardware that
definitely supports MSR_IA32_DEBUGCTLMSR with the BTF flag.

The Intel documentation says "P6 family" and later processors all have it.
I think the Kconfig dependencies are right to have it set for those and
unset for others (i.e., when 586 and earlier are supported).

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index c30162202dc4..69e2ee44fdff 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -399,3 +399,7 @@ config X86_MINIMUM_CPU_FAMILY
 	default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
 	default "3"
 
+config X86_DEBUGCTLMSR
+	bool
+	depends on !(M586MMX || M586TSC || M586 || M486 || M386)
+	default y