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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-07-20 10:51:11 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-20 10:57:34 +0300 |
| commit | 37b502f121adab26ccc2769c3063f0e1272be7de (patch) | |
| tree | 68e8d160f3344282a5b7d64737b9fed3f5435b75 /include/linux/perf | |
| parent | c76c15e6f16c1529b524ba2c519c4fcef7a45e16 (diff) | |
| download | linux-37b502f121adab26ccc2769c3063f0e1272be7de.tar.xz | |
arm/perf: Fix hotplug state machine conversion
Mark Rutland pointed out that this commit is incomplete:
7d88eb695a1f ("arm/perf: Convert to hotplug state machine")
The problem is that:
> We may have multiple PMUs (e.g. two in big.LITTLE systems), and
> __oprofile_cpu_pmu only contains one of these. So this conversion is not
> correct.
>
> We were relying on the notifier list implicitly containing a list of
> those PMUs. It seems like we need an explicit list here.
>
> We keep __oprofile_cpu_pmu around for legacy 32-bit users of OProfile
> (on non-hetereogeneous systems), and that's all that the variable should
> be used for.
Introduce arm_pmu_list to correctly handle multiple PMUs in the system.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-tip-commits@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160719111733.GA22911@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/perf')
| -rw-r--r-- | include/linux/perf/arm_pmu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h index e6ed34eb2b2b..e18843809eec 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -109,6 +109,7 @@ struct arm_pmu { DECLARE_BITMAP(pmceid_bitmap, ARMV8_PMUV3_MAX_COMMON_EVENTS); struct platform_device *plat_device; struct pmu_hw_events __percpu *hw_events; + struct list_head entry; struct notifier_block cpu_pm_nb; }; |