Merge branch 'perf/core' of...

arch/x86/include/asm/kdebug.h

arch/x86/include/asm/stacktrace.h

arch/x86/kernel/cpu/perf_event.c

arch/x86/kernel/dumpstack.c

arch/x86/kernel/dumpstack_32.c

arch/x86/kernel/dumpstack_64.c

arch/x86/kernel/process.c

arch/x86/kernel/stacktrace.c

arch/x86/mm/kmemcheck/error.c

arch/x86/oprofile/backtrace.c

include/linux/ftrace_event.h

include/linux/stacktrace.h

include/linux/syscalls.h

include/linux/tracepoint.h

include/trace/events/syscalls.h

include/trace/ftrace.h

kernel/perf_event.c

kernel/trace/trace_event_perf.c