Thread (15 messages) 15 messages, 2 authors, 7d ago

Re: [PATCH v2 0/3] powerpc/crash: protect kdump from active watchdogs

From: Sourabh Jain <hidden>
Date: 2026-07-13 05:59:34
Also in: stable


On 13/07/26 10:51, Ritesh Harjani (IBM) wrote:
Sourabh Jain [off-list ref] writes:
quoted
Changelog:
==========

v2:
  - Move H_WATCHDOG definitions to a common header for shared use
    across pseries code. 1/3
  - Added a new patch to handle pseries watchdog device registration
    failure. 2/3
  - Stop active watchdogs in crash hanlder. 3/3 Ritesh
  - Add suggested-by tag 1/3 & 3/3
Reviewed the changes and mostly looks good with some minor nits added to
the individual patches.

Small request -
Could you please also update test results with v3 in your changelog
(since you mentioned we are able to reproduce the issue easily with your
test code).
I tested this fix with the program I shared in cover letter. The watchdog
was successfully stopped even when H_WATCHDOG is called form crash
handler.  I will share my test details in v3 cover letter also.

aah one other thing I just noticed since you are ccing stable and you
added a Fixes tag in patch-3.
Patch-3 alone cannot be easily backported now due to patch-1 and
patch-2. There must be a way to define the dependencies if you are
looking for backporting the fix patch to stable tree, please check that
and follow that accordingly in v3.
I thought about that as well, but since they are part of the same patch 
series,
I assumed they would be picked together. However, I don't think that 
will work
in all cases.

I checked the older commits and noticed that a backport note was added. 
I think
we can do the same for the fix patch. I'll add a note indicating that the
following patches should be backported first:

powerpc/pseries: Move H_WATCHDOG definitions to a common header
powerpc/pseries: Handle and log pseries-wdt registration failures

Since these patches are not upstream yet, I'll refer to them by their 
commit titles.

Does that look good to you?

- Sourabh Jain
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