ACK/cmt / APPLIED[artful]: [Zesty][PATCH 1/1] powerpc/perf: Avoid spurious PMU interrupts after idle

Seth Forshee seth.forshee at canonical.com
Fri Aug 11 15:31:21 UTC 2017


On Wed, Aug 09, 2017 at 10:44:56AM -0300, Rodrigo R. Galvao wrote:
> From: Nicholas Piggin <npiggin at gmail.com>
> 
> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1709352
> 
> POWER9 DD2 can see spurious PMU interrupts after state-loss idle in
> some conditions.
> 
> A solution is to save and reload MMCR0 over state-loss idle.
> 
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> Acked-by: Madhavan Srinivasan <maddy at linux.vnet.ibm.com>
> Tested-by: Anton Blanchard <anton at samba.org>
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> (cherry picked from commit 101dd590a7fa37954540cf3149a1c502c0acc524)
> Signed-off-by: Rodrigo R. Galvao <rosattig at linux.vnet.ibm.com>

This patch had some context differences when I tried to apply it to
4.12 so I cherry picked it directly. That makes me wonder whether you
had to fix it up for zesty though; if so the "cherry picked" should be
changed to "backported".

Otherwise the patch looks fine to me.

Acked-by: Seth Forshee <seth.forshee at canonical.com>




More information about the kernel-team mailing list