Re: [RFC 08/10] Set PF_RECLAIMABLE_STACK in various places

[K Prateek Nayak]

Hello David,

On 8/28/2026 4:59 AM, David Stevens wrote:
> @@ -469,16 +470,23 @@ anon_pipe_read(struct kiocb *iocb, struct iov_iter *to)
>                         break;
>                 }
>                 mutex_unlock(&pipe->mutex);
> -               /*
> -                * We only get here if we didn't actually read anything.
> -                *
> -                * But because we didn't read anything, at this point we can
> -                * just return directly with -ERESTARTSYS if we're interrupted,
> -                * since we've done any required wakeups and there's no need
> -                * to mark anything accessed. And we've dropped the lock.
> -                */
> -               if (wait_event_interruptible_exclusive(pipe->rd_wait, pipe_readable(pipe)) < 0)
> -                       return -ERESTARTSYS;
> +
> +               {
> +                       guard(allow_stack_reclaim)();

nit. You can just use a

    scoped_guard(allow_stack_reclaim) {
        if (wait_event_interruptible_exclusive(...))
            return -ERESTARTSYS;
    }

here.

Same comment for rest of the thread where a scoped_guard() can be used
instead of this pattern.

> +                       /*
> +                        * We only get here if we didn't actually read
> +                        * anything.
> +                        *
> +                        * But because we didn't read anything, at this point
> +                        * we can just return directly with -ERESTARTSYS if
> +                        * we're interrupted, since we've done any required
> +                        * wakeups and there's no need to mark anything
> +                        * accessed. And we've dropped the lock.
> +                        */
> +                       if (wait_event_interruptible_exclusive(pipe->rd_wait,
> +                                                              pipe_readable(pipe)) < 0)
> +                               return -ERESTARTSYS;
> +               }

-- 
Thanks and Regards,
Prateek