Re: [PATCH v7 09/11] tools/testing/selftests/bpf: make it adopt to task comm size change

[Andrii Nakryiko]

On Sun, Oct 31, 2021 at 11:04 PM Yafang Shao <laoar.shao@xxxxxxxxx> wrote:
>
> The hard-coded 16 is used in various bpf progs. These progs get task
> comm either via bpf_get_current_comm() or prctl() or
> bpf_core_read_str(), all of which can work well even if the task comm size
> is changed.
>
> In these BPF programs, one thing to be improved is the
> sched:sched_switch tracepoint args. As the tracepoint args are derived
> from the kernel, we'd better make it same with the kernel. So the macro
> TASK_COMM_LEN is converted to type enum, then all the BPF programs can
> get it through BTF.
>
> The BPF program which wants to use TASK_COMM_LEN should include the header
> vmlinux.h. Regarding the test_stacktrace_map and test_tracepoint, as the
> type defined in linux/bpf.h are also defined in vmlinux.h, so we don't
> need to include linux/bpf.h again.
>
> Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> Cc: Arnaldo Carvalho de Melo <arnaldo.melo@xxxxxxxxx>
> Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> Cc: Petr Mladek <pmladek@xxxxxxxx>
> ---

LGTM, thanks.

Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>

>  include/linux/sched.h                                   | 9 +++++++--
>  tools/testing/selftests/bpf/progs/test_stacktrace_map.c | 6 +++---
>  tools/testing/selftests/bpf/progs/test_tracepoint.c     | 6 +++---
>  3 files changed, 13 insertions(+), 8 deletions(-)
>

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