[PATCH bpf-next v2 0/3] Fix test_cgroup_iter_memcg issues found during back-porting

[Hui Zhu]

From: Hui Zhu <zhuhui@xxxxxxxxxx>

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:
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):
  bpf: Use bpf_core_enum_value for stats in cgroup_iter_memcg
  selftests/bpf: Check bpf_mem_cgroup_page_state return value
  bpf: selftests: Skip kmem test when cgroup.memory=nokmem is set

 .../bpf/prog_tests/cgroup_iter_memcg.c        | 42 +++++++++++++++++++
 .../selftests/bpf/progs/cgroup_iter_memcg.c   | 41 ++++++++++++++----
 2 files changed, 76 insertions(+), 7 deletions(-)

-- 
2.43.0