hi,
with following commit:
0ebeea8ca8a4 bpf: Restrict bpf_probe_read{, str}() only to archs where they
work
the bpf_probe_read BPF helper is restricted on architectures that
have 'non overlapping address space' and select following config:
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
there's also nice explanation in this commit's changelog:
6ae08ae3dea2 bpf: Add probe_read_{user, kernel} and probe_read_{user,
kernel}_str helpers
We have a problem with bpftrace not working properly on s390x because
bpf_probe_read is no longer available, and bpftrace does not use
bpf_probe_read_(user/kernel) variants yet.
My question is if s390x is 'arch with overlapping address space' and we
could fix this by adding ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE for s390x
or we need to fix bpftrace to detect this, which we probably need to do
in any case ;-)
thanks,
jirka
