Re: [PATCH] MIPS/bpf: Enable bpf_probe_read{, str}() on MIPS again

[Sergei Shtylyov]

On 17.03.2021 10:15, Tiezhu Yang wrote:

> After commit 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to
> archs where they work"), bpf_probe_read{, str}() functions were not longer

   No longer.

> available on MIPS, so there exists some errors when running bpf program:

    Exist.

> root@linux:/home/loongson/bcc# python examples/tracing/task_switch.py
> bpf: Failed to load program: Invalid argument
> [...]
> 11: (85) call bpf_probe_read#4
> unknown func bpf_probe_read#4
> [...]
> Exception: Failed to load BPF program count_sched: Invalid argument
>
> So select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE in arch/mips/Kconfig,
> otherwise the bpf old helper bpf_probe_read() will not be available.
>
> This is similar with the commit d195b1d1d1196 ("powerpc/bpf: Enable
> bpf_probe_read{, str}() on powerpc again").
>
> Fixes: 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work")
> Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
[...]

MBR, Sergei