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authorPeter Zijlstra <peterz@infradead.org>2018-11-20 18:08:42 +0100
committerIngo Molnar <mingo@kernel.org>2018-11-20 18:57:48 +0100
commit2a5bf23d5b795d5df33dc284e8f5cf8b6a5b4042 (patch)
treea8e7207d6415cc41b8458be461909c05abf0062c /tools/build/Makefile.feature
parent9ff01193a20d391e8dbce4403dd5ef87c7eaaca6 (diff)
downloadlinux-2a5bf23d5b795d5df33dc284e8f5cf8b6a5b4042.tar.bz2
perf/x86/intel: Fix regression by default disabling perfmon v4 interrupt handling
Kyle Huey reported that 'rr', a replay debugger, broke due to the following commit: af3bdb991a5c ("perf/x86/intel: Add a separate Arch Perfmon v4 PMI handler") Rework the 'disable_counter_freezing' __setup() parameter such that we can explicitly enable/disable it and switch to default disabled. To this purpose, rename the parameter to "perf_v4_pmi=" which is a much better description and allows requiring a bool argument. [ mingo: Improved the changelog some more. ] Reported-by: Kyle Huey <me@kylehuey.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert O'Callahan <robert@ocallahan.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: acme@kernel.org Link: http://lkml.kernel.org/r/20181120170842.GZ2131@hirez.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
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