linux-kernel - Re: [PATCH] page_io: return proper error codes for swap_read_folio

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Message-ID: <CAKEwX=Njxjg+G6H4X77YPnZ=mQJaR-K8du1VP6voDLZ55ZaepA@mail.gmail.com>
Date: Tue, 1 Apr 2025 11:55:31 -0700
From: Nhat Pham <nphamcs@...il.com>
To: akpm@...ux-foundation.org
Cc: hannes@...xchg.org, yosryahmed@...gle.com, yosry.ahmed@...ux.dev, 
	chengming.zhou@...ux.dev, linux-mm@...ck.org, kernel-team@...a.com, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] page_io: return proper error codes for swap_read_folio_zeromap()

On Thu, Mar 6, 2025 at 3:00 PM Nhat Pham <nphamcs@...il.com> wrote:
>
> Similar to zswap_load(), also return proper error codes for
> swap_read_folio_zeromap():
>
> * 0 on success. The folio is unlocked and marked up-to-date.
> * -ENOENT, if the folio is entirely not zeromapped.
> * -EINVAL (with the follio unlocked but not marked to date), if the
>   folio is partially zeromapped. This is not supported, and will SIGBUS
>   the faulting process.
>
> This patch is purely a clean-up, and should not have any behavioral
> change. It is based on (and should be applied on top of) [1].
>
> [1]: https://lore.kernel.org/linux-mm/20250306205011.784787-1-nphamcs@gmail.com/
>
> Suggested-by: Yosry Ahmed <yosry.ahmed@...ux.dev>
> Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Nhat Pham <nphamcs@...il.com>

Hi Andrew, I think Yosry and Johannes signed off on this patch (with
the fixlet). Looks like it was not merged for 6.15-rc1 - let me know
if there is something I need to do.

It's mostly a clean up with no (intended) behavioral change, so no
rush of course.