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 v3 0/4] powerpc: watchdog fixes
Date: Wed, 10 Nov 2021 12:50:52 +1000 [thread overview]
Message-ID: <20211110025056.2084347-1-npiggin@gmail.com> (raw)
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(-)
--
2.23.0
next reply other threads:[~2021-11-10 2:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-10 2:50 Nicholas Piggin [this message]
2021-11-10 2:50 ` [PATCH v3 1/4] powerpc/watchdog: Fix missed watchdog reset due to memory ordering race Nicholas Piggin
2021-11-15 15:09 ` Laurent Dufour
2021-11-19 9:05 ` Nicholas Piggin
2021-11-19 9:25 ` Laurent Dufour
2021-11-10 2:50 ` [PATCH v3 2/4] powerpc/watchdog: tighten non-atomic read-modify-write access Nicholas Piggin
2021-11-10 2:50 ` [PATCH v3 3/4] powerpc/watchdog: Avoid holding wd_smp_lock over printk and smp_send_nmi_ipi Nicholas Piggin
2021-11-19 11:05 ` Nicholas Piggin
2021-11-10 2:50 ` [PATCH v3 4/4] powerpc/watchdog: read TB close to where it is used Nicholas Piggin
2021-11-25 9:36 ` [PATCH v3 0/4] powerpc: watchdog fixes Michael Ellerman
2021-11-25 15:11 ` Laurent Dufour
2021-11-25 15:26 ` Michal Suchánek
2021-11-25 17:20 ` Laurent Dufour
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