Searched hist:"29 e3ea8cbd2958cf237b84652ec236803f2c6202" (Results 1 – 2 of 2) sorted by relevance
| /linux/tools/testing/selftests/powerpc/mm/ |
| H A D | stress_code_patching.sh | 29e3ea8cbd2958cf237b84652ec236803f2c6202 Mon Feb 08 04:29:57 CET 2021 Jordan Niethe <jniethe5@gmail.com> selftests/powerpc: Test for spurious kernel memory faults on radix
Previously when mapping kernel memory on radix, no ptesync was
included which would periodically lead to unhandled spurious faults.
Mapping kernel memory is used when code patching with Strict RWX
enabled. As suggested by Chris Riedl, turning ftrace on and off does a
large amount of code patching so is a convenient way to see this kind
of fault.
Add a selftest to try and trigger this kind of a spurious fault. It
tests for 30 seconds which is usually long enough for the issue to
show up.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
[mpe: Rename it to better reflect what it does, rather than the symptom]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210208032957.1232102-2-jniethe5@gmail.com
|
| H A D | Makefile | diff 29e3ea8cbd2958cf237b84652ec236803f2c6202 Mon Feb 08 04:29:57 CET 2021 Jordan Niethe <jniethe5@gmail.com> selftests/powerpc: Test for spurious kernel memory faults on radix
Previously when mapping kernel memory on radix, no ptesync was
included which would periodically lead to unhandled spurious faults.
Mapping kernel memory is used when code patching with Strict RWX
enabled. As suggested by Chris Riedl, turning ftrace on and off does a
large amount of code patching so is a convenient way to see this kind
of fault.
Add a selftest to try and trigger this kind of a spurious fault. It
tests for 30 seconds which is usually long enough for the issue to
show up.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
[mpe: Rename it to better reflect what it does, rather than the symptom]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210208032957.1232102-2-jniethe5@gmail.com
|