Hi All,
I am currently working on enabling kpatch application on our platform
s390x. I have made few required changes to kpatch-build and it seems to
work with the upstream kernel.
My current work on s390x:
- Marking the profiling functions.
- Addition of s390x specific compile flags.
- Handling of s390x specific sections.
- Analyzing the output of various patches and checking for correctness
I checked out the optimization which is being performed in
kpatch_line_macro_change_only(). To test this:
- Added few comments in fs/namei.c, which contains various
WARN_ON()/BUG_ON() - upstream kernel.
- Currently shows as "no functional changes found" on s390x, without
implementing kpatch_line_macro_change_only() function, which seems to be
correct.
- Then, I also performed some quick test on x86 by commenting out
kpatch_line_macro_change_only() function and returning 0.
- This actually provided the same result "no functional changes found"
found. But as per my understanding, this should have shown various
section changes due to change in their line number
I was also searching for pattern which was suggested in commit 6b03bc8e
("fix WARN*_ONCE detection on newer kernels") on x86 upstream kernel,
but could not get these patterns. May be I am missing something.
Could you provide some feedback on these?
Thank you.
Best Regards
Sumanth Korikkar
--
Sumanth Korikkar
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