linux-kernel - Re: [PATCH] mm/gup: Use try_grab_page() instead of try_grab

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Date: Thu, 27 Jun 2024 23:11:16 -0700
From: Christoph Hellwig <hch@...radead.org>
To: yangge1116@....com
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	21cnbao@...il.com, peterx@...hat.com, baolin.wang@...ux.alibaba.com,
	liuzixing@...on.cn
Subject: Re: [PATCH] mm/gup: Use try_grab_page() instead of try_grab_folio()
 in gup slow path

I was complaining that switching from a folio to a page interface
is a retro-step.  But try_grab_page and try_grab_folio actually
both take a strut page argument and do similar but different things.

Yikes!

> -int __must_check try_grab_page(struct page *page, unsigned int flags)
> +int __must_check try_grab_page(struct page *page, int refs, unsigned int flags)

This would now make it a try_grab_pages.  Also please try to avoid
the overly lone lines here and in the external declaration.