[PATCH bpf-next 0/3] libbpf: support non-mmap()'able data sections

[Andrii Nakryiko <andrii@kernel.org>]

Make libbpf more conservative in using BPF_F_MMAPABLE flag with internal BPF
array maps that are backing global data sections. See patch #2 for full
description and justification.

Changes in this dataset support having bpf_spinlock, kptr, rb_tree nodes and
other "special" variables as global variables. Combining this with libbpf's
existing support for multiple custom .data.* sections allows BPF programs to
utilize multiple spinlock/rbtree_node/kptr variables in a pretty natural way
by just putting all such variables into separate data sections (and thus ARRAY
maps).

Andrii Nakryiko (3):
  libbpf: clean up and refactor BTF fixup step
  libbpf: only add BPF_F_MMAPABLE flag for data maps with global vars
  libbpf: add non-mmapable data section selftest

 tools/lib/bpf/libbpf.c                        | 176 +++++++++++-------
 .../selftests/bpf/prog_tests/skeleton.c       |  11 +-
 .../selftests/bpf/progs/test_skeleton.c       |  17 ++
 3 files changed, 138 insertions(+), 66 deletions(-)

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2.30.2