Commit d536b1f8 authored by Jan Kratochvil's avatar Jan Kratochvil Committed by Ingo Molnar

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: default avatarJan Kratochvil <>
Cc: <>
Signed-off-by: default avatarIngo Molnar <>
parent 77be1fab
......@@ -414,4 +414,4 @@ config X86_MINIMUM_CPU_FAMILY
def_bool y
depends on !(M586MMX || M586TSC || M586 || M486 || M386)
depends on !(MK6 || MWINCHIPC6 || MWINCHIP2 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386)
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