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| author | Nikolay Borisov <nik.borisov@suse.com> | 2024-05-29 18:28:50 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-17 18:45:19 +0300 |
| commit | 54183d103d38e5efefce8500ec41dfbfaba9c19d (patch) | |
| tree | a6c855cc5c0ce9f54c4c8cfe8a1abd933a87849c /tools/perf/scripts/python/task-analyzer.py | |
| parent | f385f024639431bec3e70c33cdbc9563894b3ee5 (diff) | |
| download | linux-54183d103d38e5efefce8500ec41dfbfaba9c19d.tar.xz | |
x86/kexec: Remove spurious unconditional JMP from from identity_mapped()
This seemingly straightforward JMP was introduced in the initial version
of the the 64bit kexec code without any explanation.
It turns out (check accompanying Link) it's likely a copy/paste artefact
from 32-bit code, where such a JMP could be used as a serializing
instruction for the 486's prefetch queue. On x86_64 that's not needed
because there's already a preceding write to cr4 which itself is
a serializing operation.
[ bp: Typos. Let's try this and see what cries out. If it does,
reverting it is trivial. ]
Signed-off-by: Nikolay Borisov <nik.borisov@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/all/55bc0649-c017-49ab-905d-212f140a403f@citrix.com/
Diffstat (limited to 'tools/perf/scripts/python/task-analyzer.py')
0 files changed, 0 insertions, 0 deletions