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imf11.hostedemail.com; dkim=none; spf=pass (imf11.hostedemail.com: domain of benh@kernel.crashing.org designates 63.228.1.57 as permitted sender) smtp.mailfrom=benh@kernel.crashing.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771224676; a=rsa-sha256; cv=none; b=NfX2qb7qBB/uT3ELwE72NjHHe1EdW5nVWKK+P0ZSf2Xiyqwg1G/0pVHMjkwfj1/SHTZTyg 55i6crRnPLA7oHLt9QWePpB1IqXsOVwo34EwH98bm6HmIHLWuQveI/646agSWUTcwfH1CA LFg36/iboT6oiqMzpnhAM/4tfd80uZo= Received: from [IPv6:::1] (localhost [127.0.0.1]) by gate.crashing.org (8.18.1/8.18.1/Debian-2) with ESMTP id 61G6p8tN341965; Mon, 16 Feb 2026 00:51:09 -0600 Message-ID: <78df00a4967f48a41659a5225a09b99c4b1cebb3.camel@kernel.crashing.org> Subject: Re: [PATCH] mm: Fix memblock_free_late() when using deferred struct page From: Benjamin Herrenschmidt To: Mike Rapoport Cc: linux-mm@kvack.org, Alexander Potapenko , Marco Elver , Dmitry Vyukov Date: Mon, 16 Feb 2026 17:51:08 +1100 In-Reply-To: <9a46df616e371e1680637a41ba2757b7cecf55f6.camel@kernel.crashing.org> References: <279931074239b7f3812c4cb3969f887303c8cc26.camel@kernel.crashing.org> <5a44609fe992624573a3ca0a293888bd623e2a06.camel@kernel.crashing.org> <0344bfbeb017cafc0f7bd4433eeacd9bc802d9c9.camel@kernel.crashing.org> <684d84272e7dcd2ead0770843a7e0afc625c87c9.camel@kernel.crashing.org> <9a46df616e371e1680637a41ba2757b7cecf55f6.camel@kernel.crashing.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.3-0ubuntu1.1 MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 89B4A40011 X-Rspamd-Server: rspam07 X-Stat-Signature: 3hywfrgs6hg83mufbj5nneesqn7ymk3r X-HE-Tag: 1771224676-244955 X-HE-Meta: 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 PSBWGm0V /7r0cXQ4/dwQWuQfieCbspx9OD5yT7xLgdZQANe7xLQ7nIPDGUMd2mLHlBTY4DcDU65yCRLRRzIgy0LomrvYXH30FUyo9YR7Wpvm3HaUwh8vuoIqPMmPZIyWrjc6OIqBv2sCGnKBT7tQaaUQ= 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 Mon, 2026-02-16 at 16:34 +1100, Benjamin Herrenschmidt wrote: >=20 > Here's a log on a t3 instance with you patch plus some printk's of > mine showing the EFI memory reserves and with memblock debug. Happens also on a qemu VM with 1GB of RAM, so .. :-) There's about 25MB of RAM lost to UEFI on this with whatever version of qemu I was playing with that the patch recovers. It doesn't matter which "method" of freeing the page, the original one or your free_reserved_page(). I'll switch to upstream to avoid confusion and test it all again. Cheers, Ben.