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author | Peter Zijlstra <peterz@infradead.org> | 2016-03-16 23:55:21 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-03-21 09:08:15 +0100 |
commit | 5a50f52917011365a4a2c0f1d2cea0990c4465cd (patch) | |
tree | 35a40bdf23e947e83caa3ebb5d3948e3ff72e69c /arch/x86/mm/amdtopology.c | |
parent | 0158b83f7508851cda9e62c4b14678c5bd492cb2 (diff) | |
download | op-kernel-dev-5a50f52917011365a4a2c0f1d2cea0990c4465cd.zip op-kernel-dev-5a50f52917011365a4a2c0f1d2cea0990c4465cd.tar.gz |
perf/x86/ibs: Fix race with IBS_STARTING state
While tracing the IBS bits I saw the NMI hitting between clearing
IBS_STARTING and the actual MSR writes to disable the counter.
Since IBS_STARTING was cleared, the handler assumed these were spurious
NMIs and because STOPPING wasn't set yet either, insta-triggered an
"Unknown NMI".
Cure this by clearing IBS_STARTING after disabling the hardware.
Tested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm/amdtopology.c')
0 files changed, 0 insertions, 0 deletions