[PATCH v2 bpf-next 0/2] bpf: enable stackmap with build_id in nmi

Changes v1 -> v2:
  1. Rename some variables to (hopefully) reduce confusion;
  2. Check irq_work status with IRQ_WORK_BUSY (instead of work->sem);
  3. In Kconfig, let BPF_SYSCALL select IRQ_WORK;
  4. Add static to DEFINE_PER_CPU();
  5. Remove pr_info() in stack_map_init().

Song Liu (2):
  bpf: enable stackmap with build_id in nmi context
  bpf: add selftest for stackmap with build_id in NMI context

 init/Kconfig                               |   1 +
 kernel/bpf/stackmap.c                      |  59 +++++++++++--
 tools/testing/selftests/bpf/test_progs.c   | 137 +++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/urandom_read.c |  10 ++-
 4 files changed, 199 insertions(+), 8 deletions(-)