linux-kernel - Re: [RFC][PATCH] splice: Prevent gifting of multipage folios

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Message-ID: <2737655.1677511460@warthog.procyon.org.uk>
Date:   Mon, 27 Feb 2023 15:24:20 +0000
From:   David Howells <dhowells@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     dhowells@...hat.com, Miklos Szeredi <miklos@...redi.hu>,
        Amit Shah <amit@...nel.org>, linux-fsdevel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] splice: Prevent gifting of multipage folios

Matthew Wilcox <willy@...radead.org> wrote:

> What should the Fixes: here be?  This was already possible with THPs
> (both anon and tmpfs backed) long before I introduced folios.

Good question.  How do I tell when THPs were introduced?  It looks like they
might predate git, looking at free_compound_page()'s comment.

David