On Wed, Jun 16, 2021 at 09:28:59PM +0200, Aman Priyadarshi wrote: > From: Suzuki K Poulose <suzuki.poulose@xxxxxxx> > > [ Upstream commit 3cce50dfec4a5b0414c974190940f47dd32c6dee ] > > The arm64 PMU updates the event counters and reprograms the > counters in the overflow IRQ handler without disabling the > PMU. This could potentially cause skews in for group counters, > where the overflowed counters may potentially loose some event > counts, while they are reprogrammed. To prevent this, disable > the PMU while we process the counter overflows and enable it > right back when we are done. > > This patch also moves the PMU stop/start routines to avoid a > forward declaration. > > Suggested-by: Mark Rutland <mark.rutland@xxxxxxx> > Cc: Will Deacon <will.deacon@xxxxxxx> > Acked-by: Mark Rutland <mark.rutland@xxxxxxx> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx> > Signed-off-by: Will Deacon <will.deacon@xxxxxxx> > Signed-off-by: Aman Priyadarshi <apeureka@xxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > arch/arm64/kernel/perf_event.c | 50 +++++++++++++++++++--------------- > 1 file changed, 28 insertions(+), 22 deletions(-) What stable tree(s) do you want this applied to? thanks, greg k-h
