Merge branch 'selftests-bpf-benchmark-all-symbols-for-kprobe-multi'

Menglong Dong says:

====================
selftests/bpf: benchmark all symbols for kprobe-multi

Add the benchmark testcase "kprobe-multi-all", which will hook all the
kernel functions during the testing.

This series is separated out from [1].

Changes since V2:
* add some comment to attach_ksyms_all, which notes that don't run the
  testing on a debug kernel

Changes since V1:
* introduce trace_blacklist instead of copy-pasting strcmp in the 2nd
  patch
* use fprintf() instead of printf() in 3rd patch

Link: https://lore.kernel.org/bpf/20250817024607.296117-1-dongml2@chinatelecom.cn/
====================

Link: https://patch.msgid.link/20250904021011.14069-1-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>