This path introduces several kfuncs to help BPF programs determine their current execution context. When hooking functions for statistics, we often need to use current->comm to get the process name.
However, these hooked functions can be called from either process context or interrupt context. When called from interrupt context, the current we obtain may refer to the process that was interrupted, which may not be what we need.
These new kfuncs expose APIs that allow users to determine the actual execution context.
Jiayuan Chen (2): bpf: Add kfuncs for detecting execution context selftests/bpf: Add selftests for context detection kfuncs
kernel/bpf/helpers.c | 45 +++++++++++++++++++ .../selftests/bpf/prog_tests/context.c | 32 +++++++++++++ .../selftests/bpf/progs/context_prog.c | 33 ++++++++++++++ 3 files changed, 110 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/context.c create mode 100644 tools/testing/selftests/bpf/progs/context_prog.c