diff options
| author | David Carrillo-Cisneros <davidcc@google.com> | 2016-12-22 17:17:40 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-01-05 09:13:55 +0100 |
| commit | 74545f63890e38520eb4d1dbedcadaa9c0dbc824 (patch) | |
| tree | d3edde1d5e6d82f52a789301c4f38ac6cb0e9b9a /arch/x86/events/intel/cstate.c | |
| parent | 4e06d4f083d6b485d689948479d5b2052917373d (diff) | |
perf/x86: Set pmu->module in Intel PMU modules
The conversion of Intel PMU drivers into modules did not include reference
counting. The machine will crash when attempting to access deleted code
if an event from a module PMU is started and the module removed before the
event is destroyed.
i.e. this crashes the machine:
$ insmod intel-rapl-perf.ko
$ perf stat -e power/energy-cores/ -C 0 &
$ rmmod intel-rapl-perf.ko
Set THIS_MODULE to pmu->module in Intel module PMUs so that generic code
can handle reference counting and deny rmmod while an event still exists.
Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1482455860-116269-1-git-send-email-davidcc@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/events/intel/cstate.c')
| -rw-r--r-- | arch/x86/events/intel/cstate.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c index fec8a461bdef..1076c9a77292 100644 --- a/arch/x86/events/intel/cstate.c +++ b/arch/x86/events/intel/cstate.c @@ -434,6 +434,7 @@ static struct pmu cstate_core_pmu = { .stop = cstate_pmu_event_stop, .read = cstate_pmu_event_update, .capabilities = PERF_PMU_CAP_NO_INTERRUPT, + .module = THIS_MODULE, }; static struct pmu cstate_pkg_pmu = { @@ -447,6 +448,7 @@ static struct pmu cstate_pkg_pmu = { .stop = cstate_pmu_event_stop, .read = cstate_pmu_event_update, .capabilities = PERF_PMU_CAP_NO_INTERRUPT, + .module = THIS_MODULE, }; static const struct cstate_model nhm_cstates __initconst = { |