On Thu, Mar 25, 2021 at 08:50:01PM +0800, Tiezhu Yang wrote:

After commit 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to
archs where they work"), bpf_probe_read{, str}() functions were no longer
available on MIPS, so there exist some errors when running bpf program:

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

ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE should be restricted to archs
with non-overlapping address ranges, but they can overlap in EVA mode
on MIPS, so select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE if !EVA in
arch/mips/Kconfig, otherwise the bpf old helper bpf_probe_read() will
not be available.

This is similar with the commit d195b1d1d119 ("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@loongson.cn>
---

v3: Select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE if !EVA
    on MIPS.

v2: update the commit message to fix typos found by
    Sergei Shtylyov, thank you!

    not longer --> no longer
    there exists --> there exist

 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)

applied to mips-next.

Thomas.

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