alexander.levin@xxxxxxxxxxx writes: > On Thu, Dec 14, 2017 at 12:10:39AM +1100, Michael Ellerman wrote: >>alexander.levin@xxxxxxxxxxx writes: >> >>> From: Nicholas Piggin <npiggin@xxxxxxxxx> >>> >>> [ Upstream commit 064996d62a33ffe10264b5af5dca92d54f60f806 ] >>> >>> The SMP hardlockup watchdog cross-checks other CPUs for lockups, which >>> causes xmon headaches because it's assuming interrupts hard disabled >>> means no watchdog troubles. Try to improve that by calling >>> touch_nmi_watchdog() in obvious places where secondaries are spinning. >>> >>> Also annotate these spin loops with spin_begin/end calls. >> >>These macros didn't exist until 4.13, and haven't been backported AFAIK. > > But the touch_nmi_watchdog() bits are something we want in stable, right? I don't think you need them unless you've also back ported arch/powerpc/kernel/watchdog.c, which I don't think you have. Maybe Nick can confirm? Also, I thought 3.18 was EOL? cheers