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由 Jan Kratochvil 提交于
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=456175Signed-off-by: NJan Kratochvil <jan.kratochvil@redhat.com> Cc: <stable@kernel.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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