[PATCH bpf-next v3 0/3] Fix test_cgroup_iter_memcg issues found during back-porting

[Hui Zhu <hui.zhu@linux.dev>]

From: Hui Zhu <zhuhui@kylinos.cn>

While back-porting "mm: bpf kfuncs to access memcg data", I
encountered issues with test_cgroup_iter_memcg, specifically
in test_kmem.

These patches are my fixes for the problems I encountered.

Changelog:
v3:
According to the comments of JP Kobryn, remove kmem subtest from
cgroup_iter_memcg and fix assertion string in test_pgfault.
v2:
According to the comments of JP Kobryn, added bpf_core_enum_value()
usage in the BPF program to handle cross-kernel enum value differences
at load-time instead of compile-time.
Dropped the mm/memcontrol.c patch.
Modified test_kmem handling: instead of skipping when nokmem is set,
verify that kmem value is zero as expected.
According to the comments of bot, fixed assertion message: changed
"bpf_mem_cgroup_page_state" to "bpf_mem_cgroup_vm_events" for PGFAULT
check.

Hui Zhu (3):
  selftests/bpf: Remove kmem subtest from cgroup_iter_memcg
  bpf: Use bpf_core_enum_value for stats in cgroup_iter_memcg
  selftests/bpf: Check bpf_mem_cgroup_page_state return value

 .../testing/selftests/bpf/cgroup_iter_memcg.h |  2 -
 .../bpf/prog_tests/cgroup_iter_memcg.c        | 38 +++++--------------
 .../selftests/bpf/progs/cgroup_iter_memcg.c   | 18 ++++++---
 3 files changed, 22 insertions(+), 36 deletions(-)

-- 
2.43.0