[PATCH v2 0/7] task comm cleanups

[Yafang Shao]

This patchset is part of the patchset "extend task comm from 16 to 24"[1].
Now we have different opinion that dynamically allocates memory to store
kthread's long name into a separate pointer, so I decide to take the useful
cleanups apart from the original patchset and send it separately[2].

These useful cleanups can make the usage around task comm less
error-prone. Furthermore, it will be useful if we want to extend task
comm in the future.

[1]. https://lore.kernel.org/lkml/20211101060419.4682-1-laoar.shao@xxxxxxxxx/
[2]. https://lore.kernel.org/lkml/CALOAHbAx55AUo3bm8ZepZSZnw7A08cvKPdPyNTf=E_tPqmw5hw@xxxxxxxxxxxxxx/

Changes since v1:
- improve the subject and description
- add comment to explain the hard-coded 16 in patch #4

Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@xxxxxxxxx>
Cc: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
Cc: Michal Miroslaw <mirq-linux@xxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>

Yafang Shao (7):
  fs/exec: replace strlcpy with strscpy_pad in __set_task_comm
  fs/exec: replace strncpy with strscpy_pad in __get_task_comm
  drivers/infiniband: replace open-coded string copy with get_task_comm
  fs/binfmt_elf: replace open-coded string copy with get_task_comm
  samples/bpf/test_overhead_kprobe_kern: replace bpf_probe_read_kernel
    with bpf_probe_read_kernel_str to get task comm
  tools/bpf/bpftool/skeleton: replace bpf_probe_read_kernel with
    bpf_probe_read_kernel_str to get task comm
  tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN

 drivers/infiniband/hw/qib/qib.h                       |  2 +-
 drivers/infiniband/hw/qib/qib_file_ops.c              |  2 +-
 fs/binfmt_elf.c                                       |  2 +-
 fs/exec.c                                             |  5 +++--
 include/linux/elfcore-compat.h                        |  5 +++++
 include/linux/elfcore.h                               |  5 +++++
 include/linux/sched.h                                 |  9 +++++++--
 samples/bpf/offwaketime_kern.c                        |  4 ++--
 samples/bpf/test_overhead_kprobe_kern.c               | 11 ++++++-----
 samples/bpf/test_overhead_tp_kern.c                   |  5 +++--
 tools/bpf/bpftool/skeleton/pid_iter.bpf.c             |  4 ++--
 .../testing/selftests/bpf/progs/test_stacktrace_map.c |  6 +++---
 tools/testing/selftests/bpf/progs/test_tracepoint.c   |  6 +++---
 13 files changed, 42 insertions(+), 24 deletions(-)

-- 
2.17.1