[PATCH v2 0/5] powerpc: watchdog fixes

These are some watchdog fixes and improvements.

This has taken a while to post out because upstream printk code seems
to have a problem with indefinitely delaying NMI context printk while
the CPU remains stuck, so that confounded testing a bit. That might
require another watchdog change after I discuss the issue with upstream
printk maintainers.

Since v1:
- Fixes noticed by Laurent in v1.
- Correct the description of the ABBA deadlock I wrote incorrectly in
  v1.
- Made several other improvements (patches 2,4,5).

Thanks,
Nick

Nicholas Piggin (5):
  powerpc/watchdog: Fix missed watchdog reset due to memory ordering
    race
  powerpc/watchdog: Tighten non-atomic read-modify-write access
  powerpc/watchdog: Avoid holding wd_smp_lock over printk and
    smp_send_nmi_ipi
  powerpc/watchdog: Read TB close to where it is used
  powerpc/watchdog: Remove backtrace print from unstuck message

 arch/powerpc/kernel/watchdog.c | 183 +++++++++++++++++++++++++--------
 1 file changed, 142 insertions(+), 41 deletions(-)

-- 
2.23.0