From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Laurent Dufour <ldufour@linux.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH v2 0/5] powerpc: watchdog fixes
Date: Fri, 5 Nov 2021 02:10:52 +1000 [thread overview]
Message-ID: <20211104161057.1255659-1-npiggin@gmail.com> (raw)
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
next reply other threads:[~2021-11-04 16:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-04 16:10 Nicholas Piggin [this message]
2021-11-04 16:10 ` [PATCH v2 1/5] powerpc/watchdog: Fix missed watchdog reset due to memory ordering race Nicholas Piggin
2021-11-05 9:20 ` Laurent Dufour
2021-11-05 11:46 ` Nicholas Piggin
2021-11-05 12:15 ` Laurent Dufour
2021-11-04 16:10 ` [PATCH v2 2/5] powerpc/watchdog: Tighten non-atomic read-modify-write access Nicholas Piggin
2021-11-05 16:17 ` Laurent Dufour
2021-11-04 16:10 ` [PATCH v2 3/5] powerpc/watchdog: Avoid holding wd_smp_lock over printk and smp_send_nmi_ipi Nicholas Piggin
2021-11-04 16:10 ` [PATCH v2 4/5] powerpc/watchdog: Read TB close to where it is used Nicholas Piggin
2021-11-05 13:39 ` Laurent Dufour
2021-11-04 16:10 ` [PATCH v2 5/5] powerpc/watchdog: Remove backtrace print from unstuck message Nicholas Piggin
2021-11-04 16:48 ` Laurent Dufour
2021-11-05 1:28 ` Nicholas Piggin
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