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

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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



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