Messages in this thread | | | Date | Thu, 03 Nov 2022 13:00:12 +0100 | From | Peter Zijlstra <> | Subject | [PATCH 0/2] bpf: Yet another approach to fix the BPF dispatcher thing |
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Hi!
Even thought the __attribute__((patchable_function_entry())) solution to the BPF dispatcher woes works, it turns out to not be supported by the whole range of ageing compilers we support. Specifically this attribute seems to be GCC-8 and later.
This is another approach -- using static_call() to rewrite the dispatcher function. I've compile tested this on:
x86_64 (inline static-call support) i386 (out-of-line static-call support) aargh64 (no static-call support)
A previous version was tested and found working by Bjorn.
It is split in two patches; first reverting the current approach and then introducing the new for ease of review.
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