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| author |   Borislav Petkov (AMD) <bp@alien8.de> | 2023-05-12 14:05:11 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-05-12 17:53:18 +0200 |
| commit | d2408e043e7296017420aa5929b3bba4d5e61013 (patch) | |
| tree | 8f02c7889df096fd43ab30c8a2bb7ae031b3f521 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | x86/alternative: Complicate optimize_nops() some more (diff) | |
| download | wireguard-linux-d2408e043e7296017420aa5929b3bba4d5e61013.tar.xz wireguard-linux-d2408e043e7296017420aa5929b3bba4d5e61013.zip | |
x86/alternative: Optimize returns patching
Instead of decoding each instruction in the return sites range only to
realize that that return site is a jump to the default return thunk
which is needed - X86_FEATURE_RETHUNK is enabled - lift that check
before the loop and get rid of that loop overhead.
Add comments about what gets patched, while at it.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230512120952.7924-1-bp@alien8.de
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