linux-kernel - Re: [PATCH] mm: fix unproperly folio_put by changing API in read

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Message-ID: <ZgQR77VVaiitIinS@casper.infradead.org>
Date: Wed, 27 Mar 2024 12:32:47 +0000
From: Matthew Wilcox <willy@...radead.org>
To: "zhaoyang.huang" <zhaoyang.huang@...soc.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Zhaoyang Huang <huangzhaoyang@...il.com>, steve.kang@...soc.com
Subject: Re: [PATCH] mm: fix unproperly folio_put by changing API in
 read_pages

On Wed, Mar 27, 2024 at 01:54:06PM +0800, zhaoyang.huang wrote:
> From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
> 
> According to the comments of readahead_page[3], the refcnt which
> represents page cache dropped in [1] makes sense for two reasons, '1.
> The folio is going to do IO and is locked until IO done;2. The refcnt
> will be added back when found again from the page cache and then serve
> for PTE or vfs' while it doesn't make sense in [2] as the refcnt of
> page cache will be dropped in filemap_remove_folio.

NAK, per previous email.