linux-kernel - Re: [PATCH v22 1/4] mm: add MAP_DROPPABLE for designating always lazily freeable mappings

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Message-ID: <ZpCFNA2VDoB_7waS@zx2c4.com>
Date: Fri, 12 Jul 2024 03:21:56 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
	tglx@...utronix.de, linux-crypto@...r.kernel.org,
	linux-api@...r.kernel.org, x86@...nel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>,
	Carlos O'Donell <carlos@...hat.com>,
	Florian Weimer <fweimer@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	Jann Horn <jannh@...gle.com>,
	Christian Brauner <brauner@...nel.org>,
	David Hildenbrand <dhildenb@...hat.com>, linux-mm@...ck.org
Subject: Re: [PATCH v22 1/4] mm: add MAP_DROPPABLE for designating always
 lazily freeable mappings

On Fri, Jul 12, 2024 at 12:29:17AM +0200, David Hildenbrand wrote:
> > I'll try to think of some corner cases we might be missing.
> 
> Sorry that I keep coming up with corner cases :) But these should be easy to handle:

Thank you for coming up with them!

> We don't want to suddenly get pages that are swapbacked.
 
> Otherwise someone could place swapbacked pages in there (using UFFDIO_MOVE)

Both seem like reasonable concerns. Added to v+1.

Jason