Commit d536b1f8 authored Jul 22, 2008 by Jan Kratochvil Committed by Ingo Molnar Jul 22, 2008

x86: fix crash due to missing debugctlmsr on AMD K6-3

currently if you use PTRACE_SINGLEBLOCK on AMD K6-3 (i586) it will crash.
Kernel now wrongly assumes existing DEBUGCTLMSR MSR register there.

Removed the assumption also for some other non-K6 CPUs but I am not sure there
(but it can only bring small inefficiency there if my assumption is wrong).

Based on info from Roland McGrath, Chuck Ebbert and Mikulas Patocka.
More info at:
	https://bugzilla.redhat.com/show_bug.cgi?id=456175



Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 77be1fab

arch/x86/Kconfig.cpu

+1 −1

Original line number	Diff line number	Diff line
		@@ -414,4 +414,4 @@ config X86_MINIMUM_CPU_FAMILY

		config X86_DEBUGCTLMSR
		def_bool y
		depends on !(M586MMX \|\| M586TSC \|\| M586 \|\| M486 \|\| M386)
		depends on !(MK6 \|\| MWINCHIPC6 \|\| MWINCHIP2 \|\| MWINCHIP3D \|\| MCYRIXIII \|\| M586MMX \|\| M586TSC \|\| M586 \|\| M486 \|\| M386)