Re: [PATCH 0/2] bpf: Yet another approach to fix the BPF dispatcher thing

[Björn Töpel]

Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:

> 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.

Took it for a spin on x86_64/KVM. For the series:

Acked-by: Björn Töpel <bjorn@xxxxxxxxxx>
Tested-by: Björn Töpel <bjorn@xxxxxxxxxx>