On Tue, Oct 18, 2022 at 09:59:34AM +0200, Jiri Olsa wrote:
> The patchable_function_entry(5) might output 5 single nop
> instructions (depends on toolchain), which will clash with
> bpf_arch_text_poke check for 5 bytes nop instruction.
>
> Adding early init call for dispatcher that checks and change
> the patchable entry into expected 5 nop instruction if needed.
>
> There's no need to take text_mutex, because we are using it
> in early init call which is called at pre-smp time.
>
> Fixes: ceea991a019c ("bpf: Move bpf_dispatcher function out of ftrace locations")
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
