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Thu, 23 Apr 2026 10:42:08 -0700 (PDT) Date: Thu, 23 Apr 2026 17:42:07 +0000 From: Pasha Tatashin To: Michal Clapinski Cc: Evangelos Petrongonas , Pasha Tatashin , Mike Rapoport , Pratyush Yadav , Alexander Graf , Samiullah Khawaja , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan Subject: Re: [PATCH v9 1/3] kho: fix deferred initialization of scratch areas Message-ID: References: <20260423122538.140993-1-mclapinski@google.com> <20260423122538.140993-2-mclapinski@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260423122538.140993-2-mclapinski@google.com> X-Stat-Signature: hn4yffjgisywmy6nwu8os9mk88h6gy9h X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 16FB018000A X-Rspam-User: X-HE-Tag: 1776966129-480377 X-HE-Meta: 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 x+O5wbJI sHRV+lMAm0/bX5ltavDuT6qnoj4jVb47/yGAoitBHZLLj+70/PT5B7SUYrDLeHN3f6Bn697t90tc9yHcErW8VOo4dfQqSpCdD83t6PrgIe9lAZubPsfpTlte7ZGFDfgNvlr33co//Axi3VzyMHHZMkg3SlkpFC99BYRFQuwyGMapCaJeIkbstK5YbqOOLTIsoS1qLoJo534h5XM8UviFE6vGuiuL8gDDq+O3H5AG99/p2xiagKuEk8eMh2mjtahI+rdQNM3bD65nBAiAJQt0vk1UioPA2onhsdNFywicZItcAj/T+yGwH7vOYSyoq2q/IYb3tafjVBF+ayvaYFBfujHk5aDOQ2Swhqu68JnozQlR/d64PIPvJjfduT/w4WbIzAU1Saq/nlFVARjAmHRGRsgVMldvT32XJiWXs Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 04-23 14:25, Michal Clapinski wrote: > Currently, if CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled, > kho_release_scratch() will initialize the struct pages and set migratetype > of KHO scratch. Unless the whole scratch fits below first_deferred_pfn, > some of that will be overwritten either by deferred_init_pages() or > memmap_init_reserved_range(). > > To fix it, make memmap_init_range(), deferred_init_memmap_chunk() and > __init_page_from_nid() recognize KHO scratch regions and set > migratetype of pageblocks in those regions to MIGRATE_CMA. > > Co-developed-by: Mike Rapoport (Microsoft) > Signed-off-by: Mike Rapoport (Microsoft) > Signed-off-by: Michal Clapinski Reviewed-by: Pasha Tatashin