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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>
This commit is contained in:
Roland McGrath 2008-01-30 13:30:54 +01:00 committed by Ingo Molnar
parent d2499d8b6c
commit 0a049bb0ab
1 changed files with 4 additions and 0 deletions
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arch/x86/Kconfig.cpu
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@ -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