Re: [PATCH -next v5 3/3] cpuset: add helpers for cpus read and cpuset_mutex locks

[Michal Koutný]

(I wrote this yesterday before merging but I'm still sending it to give
my opinion ;-))

On Mon, Aug 25, 2025 at 03:23:52AM +0000, Chen Ridong <chenridong@xxxxxxxxxxxxxxx> wrote:
> From: Chen Ridong <chenridong@xxxxxxxxxx>
> 
> cpuset: add helpers for cpus_read_lock and cpuset_mutex locks.
> 
> Replace repetitive locking patterns with new helpers:
> - cpuset_full_lock()
> - cpuset_full_unlock()

I don't see many precedents elsewhere in the kernel for such naming
(like _lock and _full_lock()). Wouldn't it be more illustrative to have
cpuset_read_lock() and cpuset_write_lock()? (As I'm looking at current
users and your accompanying comments which could be substituted with
the more conventional naming.)

(Also if you decide going this direction, please mention commit
111cd11bbc548 ("sched/cpuset: Bring back cpuset_mutex") in the message
so that it doesn't tempt to do further changes.)


> This makes the code cleaner and ensures consistent lock ordering.

Lock guards anyone? (When you're touching this and seeking clean code.)

Thanks,
Michal

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