From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3A1C8CA0FE9 for ; Mon, 25 Aug 2025 12:39:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C4DC210E456; Mon, 25 Aug 2025 12:39:41 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="DmWBU4Vz"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id A24E510EB71; Fri, 22 Aug 2025 17:09:54 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id BE2F160203; Fri, 22 Aug 2025 17:09:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 506C3C4CEED; Fri, 22 Aug 2025 17:09:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755882593; bh=NEyazjWgDDK3Y8sTMLiPKtOTS94IEzEQJlr1MXdW648=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DmWBU4VzSCcAnl6Zdrhjx6ksjldQdRyRt8SGGJHoy1Xwe7M0wFFiAnOgc7AY/DT0q lyqL/1TbY9lw6Mk6ofMnsxQa0R5tG+ekC6WUSLcyfnxUCURU/dBA0VxXY7c6IJ9LBi dspILvQPKUlPvqhEvwNtu+fRhuKR7/IUmABwpf10OfXceruEb+htOjuVlClrNaqJfU QZNtMHJYtlsQdWeTBL2WlQglN7zceCD+RoTlZDKPvwA5Fz0NZs4QmCTFXTFDq7ZuUg eXWdY/p99/aQ44iT5rRcus/JttgHgvk0uE55mO5Gfzz0M9Zot8coHQnhPz2Tn/edlI y9z5UNwm6HZrw== From: SeongJae Park To: David Hildenbrand Cc: SeongJae Park , linux-kernel@vger.kernel.org, Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan Subject: Re: [PATCH RFC 07/35] mm/memremap: reject unreasonable folio/compound page sizes in memremap_pages() Date: Fri, 22 Aug 2025 10:09:51 -0700 Message-Id: <20250822170951.53418-1-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250821200701.1329277-8-david@redhat.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Mon, 25 Aug 2025 12:39:32 +0000 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, 21 Aug 2025 22:06:33 +0200 David Hildenbrand wrote: > Let's reject unreasonable folio sizes early, where we can still fail. > We'll add sanity checks to prepare_compound_head/prepare_compound_page > next. > > Is there a way to configure a system such that unreasonable folio sizes > would be possible? It would already be rather questionable. > > If so, we'd probably want to bail out earlier, where we can avoid a > WARN and just report a proper error message that indicates where > something went wrong such that we messed up. > > Signed-off-by: David Hildenbrand Acked-by: SeongJae Park Thanks, SJ [...]