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| author | James Morse <[email protected]> | 2020-05-19 18:21:08 +0000 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2020-05-20 08:36:01 +0000 |
| commit | 472de63b0b8383565e103f809f5df37d1c4390ab (patch) | |
| tree | d2bc2eb495a0b2e8a8bde740987a2a7104c0d9d4 /tools/perf/scripts/python/event_analyzing_sample.py | |
| parent | firmware: arm_sdei: remove unused interfaces (diff) | |
| download | kernel-472de63b0b8383565e103f809f5df37d1c4390ab.tar.gz kernel-472de63b0b8383565e103f809f5df37d1c4390ab.zip | |
firmware: arm_sdei: Document the motivation behind these set_fs() calls
The SDEI handler save/restores the addr_limit using set_fs(). It isn't
very clear why. The reason is to mirror the arch code's entry assembly.
The arch code does this because perf may access user-space, and
inheriting the addr_limit may be a problem.
Add a comment explaining why this is here.
Suggested-by: Christoph Hellwig <[email protected]>
Signed-off-by: James Morse <[email protected]>
Link: https://bugs.chromium.org/p/project-zero/issues/detail?id=822
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/event_analyzing_sample.py')
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