[PATCH bpf-next 0/2] bpf: Introduce bpf_in_interrupt kfunc

[Leon Hwang <leon.hwang@linux.dev>]

Filtering pid_tgid is meaningless when the current task is preempted by
an interrupt.

To address this, introduce the bpf_in_interrupt kfunc, which allows BPF
programs to determine whether they are executing in interrupt context.

Internally, bpf_in_interrupt() is a thin wrapper around in_interrupt().
It is marked as fastcall function.

On x86_64, it is inlined for efficiency.

Leon Hwang (2):
  bpf: Introduce bpf_in_interrupt kfunc
  selftests/bpf: Add case to test bpf_in_interrupt kfunc

 kernel/bpf/helpers.c                    |  9 +++++++++
 kernel/bpf/verifier.c                   | 11 +++++++++++
 tools/testing/selftests/bpf/progs/irq.c |  7 +++++++
 3 files changed, 27 insertions(+)

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2.50.1