This will allow you to specify the PMU name on the command line, and will fix any issues in the future where the legacy event is different to the PMU’s own event but has the same name.

This will also make riscv work better because they may not have legacy events.

See:

Regression thread:
https://lkml.org/lkml/2023/11/21/547

Ignore warnings thread:
https://lore.kernel.org/lkml/f30f676e-a1d7-4d6b-94c1-3bdbd1448887@arm.com/

Linus, fix not fully working thread (same as above):
https://lore.kernel.org/lkml/20240525152927.665498-1-irogers@google.com/

Original regression:
https://lore.kernel.org/lkml/CAHk-=wiWvtFyedDNpoV7a8Fq_FpbB+F5KmWK2xPY3QoYseOf_A@mail.gmail.com/