x86: debugctlmsr kprobes
This adjusts the x86 kprobes implementation to cope with per-thread MSR_IA32_DEBUGCTLMSR being set for user mode. I haven't delved deep enough into the kprobes code to be really sure this covers all the cases where the user-mode BTF setting needs to be cleared or restored. It looks about right to me. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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