These are some watchdog fixes and improvements, in particular a
deadlock between the wd_smp_lock and console lock when the watchdog
fires, found by Laurent.
Thanks,
Nick
Since v2:
- Fix a false positive warning in patch 1 found by Laurent.
- Move a comment change hunk to the correct patch.
- Drop the patch that removed the unstuck backtrace which is considered
useful.
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).
Nicholas Piggin (4):
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
arch/powerpc/kernel/watchdog.c | 182 ++++++++++++++++++++++++++-------
1 file changed, 147 insertions(+), 35 deletions(-)
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2.23.0