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Date:   Fri, 19 Mar 2021 04:01:46 +0000
From:   Matthew Wilcox <willy@infradead.org>
To:     linux-mm@kvack.org
Cc:     linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v4 00/25] Page folios
Message-ID: <20210319040146.GY3420@casper.infradead.org>
References: <20210305041901.2396498-1-willy@infradead.org>
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On Fri, Mar 05, 2021 at 04:18:36AM +0000, Matthew Wilcox (Oracle) wrote:
> Our type system does not currently distinguish between tail pages and
> head or single pages.  This is a problem because we call compound_head()
> multiple times (and the compiler cannot optimise it out), bloating the
> kernel.  It also makes programming hard as it is often unclear whether
> a function operates on an individual page, or an entire compound page.

I've pushed a new version out here:
https://git.infradead.org/users/willy/pagecache.git/shortlog/refs/heads/folio

I think it takes into account everyone's comments so far.  It even compiles.