On Thu, 17 Jun 2021 05:51:03 +0100, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > 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? I guess that'd be 4.14 and previous stables if the patch actually applies. Thanks, M. -- Without deviation from the norm, progress is not possible.
