On Wed, Sep 21, 2022 at 9:40 PM Namhyung Kim <namhyung@xxxxxxxxxx> wrote: > > The perf_event_cgrp_id can be different on other configurations. > To be more portable as CO-RE, it needs to get the cgroup subsys id > using the bpf_core_enum_value() helper. > I remember using bpf_core_enum_value requires a compiler built-in. So the build will fail on old compiler such as clang-11. See [1]. Maybe we should surround it with #if __has_builtin(__builtin_preserve_enum_value) to be sure. [1] https://www.spinics.net/lists/bpf/msg30859.html > Suggested-by: Ian Rogers <irogers@xxxxxxxxxx> > Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx> > --- [...]
