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[35.199.49.16]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-5ee0c5afeb2sm4730325e0c.9.2026.11.11.13.36.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Nov 2026 13:36:40 -0800 (PST) X-Archived-By: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 11 Nov 2026 16:36:39 -0500 Message-Id: To: "Pasha Tatashin" , "Chris Down" Cc: , , , , , , Subject: Re: [PATCH] kho: Prevent reuse of preserved pages after a reservation failure From: "Pasha Tatashin" X-Mailer: aerc 0.22.0-39-g5d7784875be2 References: <179443248353.2329176.13720873996862751451.b4-review@b4> In-Reply-To: <179443248353.2329176.13720873996862751451.b4-review@b4> X-Rspamd-Queue-Id: 8DA0CC0004 X-Rspamd-Server: rspam12 X-Stat-Signature: kd96cj7m8g8ob1mbpojw9ffqhgm684ic X-Rspam-User: X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1794433001-246343 X-HE-Meta: U2FsdGVkX1+433e6Z0Go/RKW5eju/A2v4dVknjXbDgFKCVjRQp0vXTOQ7t8wwJ5nwhs45NgwKajqu9qBTil0FYgHUyoc6zqqCxDACHw70a6fCQQdaUiSldqAjAlCggF2ADsKrEvdqSBpE/5zfKI7RQTD+SUIniWVT88cGIRt34W9918VL5BIJQfZR3zTQKMbnNn6+LRP6dn55kupkiFTGORXGG58Jl7tvkVmoJv7QQt1YxryKDJhPAswgd1QiQTTEFuxyvKBLwAneB96uVOJRybUghm908n6zUnVRHkJ4GNhw5uXg+nS7Tt+BP93mot7jBbDuXBRIT8HbI2/aCMDVlpEgCvaQB+DnZLH44gHtD74/logvUwV4W/xw1jld8AXM684iYnspKOI6xy3WbgNXL+VX+pBImbUuWCZVHtwUZ8/9n7dt+ySCKjB5FR/3ZFmp0Cm7ipkZE1FLbiJVMTx2xi9gnLp6ukCaRnGPCNkxeAuZGOnkJUz4oaCwDLS31iH095aCTUx2eF7WmmibsU6erh3ysJCMnjNWqZgXhpzPdqIdtZfwMsr9peUs5iWA0QiT83aVF74pQXnrIe3CHEIPb3o0TL1XHSPISlv99hdZfEVGL98soZiOa6FxTVqwEHDxRGY9naOZUQnBMw1S8NVQgCvk3BXTpqH+zo+Ce9XllozYciGwv3ZQQoE/iW3DXhVMfHcZNBYnN2JLRJAIrYn+Om3wsu05lV+7EOphqRdc0caQXcTHAaPTx77diTkrCI7n0quOzDVVkF8i2NPDJ8xAHjIJ6J0802wHTrf2zDPmym3b1e8VMUJUNFW29TogWPsE2uEtCqD6+6u7QMEkLNYxvd/G3ANdalbKWRD6DXyaMvGwuzyc9j25zVm4pH3vVNeGDgc55/mN69cBHPIVi/CaaGsIr0wTIg3vS9l++wi0SFr19GNNf8/IY577GaGiIT1ovqwpjx1M1NOcHKgNem dUqUyOvS 3JLMu+Hs6+ef0s93DhaBUVTIwnN9zmktf5ty5MjThePNXl0ENpXEIsGTcKXQSOMtv0NQMkzAMRu2b/TtLq5d/9LWwnuCelXztZaPsbB1W7ijswEZVxYfiv0quqQZINcL+X2IlJDq/IPbcUcVYZrWcIXCHr/VXqhZWelk40rK3Nu4G2Q/uRqnNjekFFSVXRykQuJuJrsBN2iY6aAxuYnMPH9mzQkrGTi04wGCIpMnCfU/B2UwqTBENeKmY/r/Kqfz72FBpzRGsIJs/kwzbbvxPM47FgfwidQCaBNG9HXF/H6YJM8WaCfvjcauqaferNxEKHhWkOWhCeuPI3d1BpTD4SWch24j5Ttlp604e7YS4MhfzD2eXNtykchsZCvrWnaeB0FcG1XjPuAtjSSr0DH8luYEk1IiYAh2O1Ic3zSPrBZ0hp8SOO0g3lvewR+6e1aHCW1rD+C60xuB6jkQK1KntBFV8jgU0sdpuErGlwkBX3Y4jAE1VU+vesoCGPEeAdg0JJ5u0q5sBlkJ0OApEyk82pVZtqOTnYhD3qMtMysknU8ZzWSsN9nX8baJzZA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed Nov 11, 2026 at 4:28 PM EST, Pasha Tatashin wrote: > On Tue, 10 Nov 2026 23:09:30 -0800, Chris Down wro= te: >> kho_preserved_memory_reserve() reserves each range of preserved memory >> in memblock and marks it noinit, but ignores both return values. Either >> can fail when memblock has to grow its reserved array and can't find >> room, which at this point in boot it may only take from KHO bootmem. >> The boot then goes on as if the range were reserved, and two things >> can follow: >>=20 >> [...] > > Reviewed-by: Pasha Tatashin ^^^ I mixed up my review threads and replied to this one by mistake. I=20 intended to reply to: "kho: Reclaim the metadata page left reserved=20 after kexec". Regardless, we are still waiting for v2 on this patch, and=20 I will send a separate email regarding the other one. --=20 Pasha