On Tue, Nov 30, 2021 at 10:22 PM Steven Rostedt [off-list ref] wrote:

On Tue, 30 Nov 2021 11:01:27 +0800
Yafang Shao [off-list ref] wrote:

quoted

There are three options,
- option 1
  comment on all the hard-coded 16 to explain why it is hard-coded
- option 2
  replace the hard-coded 16 that can be replaced and comment on the
others which can't be replaced.
- option 3
   replace the hard-coded 16 that can be replaced and specifically
define TASK_COMM_LEN_16 in other files which can't include
linux/sched.h.

Which one do you prefer ?

Option 3. Since TASK_COMM_LEN_16 is, by it's name, already hard coded to
16, it doesn't really matter if you define it in more than one location.

Or we could define it in another header that include/sched.h can include.

The idea of having TASK_COMM_LEN_16 is to easily grep for it, and also know
exactly what it is used for when people see it being used.

I will send a separate patch (or patchset) to replace all the old
hard-coded 16 with TASK_COMM_LEN_16 based on the -mm tree.

--
Thanks
Yafang