[PATCH 23/27] x86: debugctlmsr kconfig

[Roland McGrath]

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@xxxxxxxxxx>
---
 arch/x86/Kconfig.cpu |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index c301622..69e2ee4 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
-
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