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Donenfeld" To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, patches@lists.linux.dev, tglx@linutronix.de, linux-crypto@vger.kernel.org, linux-api@vger.kernel.org, x86@kernel.org, Linus Torvalds , Greg Kroah-Hartman , Adhemerval Zanella Netto , Carlos O'Donell , Florian Weimer , Arnd Bergmann , Jann Horn , Christian Brauner , David Hildenbrand , linux-mm@kvack.org Subject: Re: [PATCH v22 1/4] mm: add MAP_DROPPABLE for designating always lazily freeable mappings Message-ID: References: <20240709130513.98102-1-Jason@zx2c4.com> <20240709130513.98102-2-Jason@zx2c4.com> <378f23cb-362e-413a-b221-09a5352e79f2@redhat.com> <5a875a3a-2243-4eab-856f-bc53ccfec3ea@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <5a875a3a-2243-4eab-856f-bc53ccfec3ea@redhat.com> X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 6A040C0010 X-Stat-Signature: zw1erbbd4xmkurkdoq3npxjh5b5zm1ms X-Rspam-User: X-HE-Tag: 1720747325-932938 X-HE-Meta: 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 Ab1FzAW8 azlzwCeiMnmH5dU6EiJhWk6UWIEfTofG3jzsDpV7+fSzLrB9dAqTlnikiVjPud4p+m50qvLpyNvhkmHqk2h2/rJU4UIbj1dV6plegzYbpY9QzBJokyG27T0/a60T/2/6fTGXcCDXdIskt7jY2/taVORcwiSK8psFavTlQXa80gg/5kBs7RkKXcqOdD+fEIyl2gR1IZBMAJCfhpz69oWUUKuB/Tz/o5N4iymXwKLh6YrV70UjplVYiFTjI+VoZURY4niIPWj+rLVKiPy2bNAz1kzYI7LPeAFAxH0sYL2g4B8veJcSl2RPA1cQ2GcnSGRZPeBKwpeP4qOKWDl+yP4+0npQbgNnu9ZUVYWOm4/4noh74buSzihH+Pa9RnbEPgvmC0EnhzNm7zz+4kADEAUyQThRcHULO3m5qM+RHytqxLoJ929iOTlTBx/7tFENnHYKfWUJhIED874VxbLF11pyM1E1PvHSpzFYmgOe8 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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