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Thu, 23 Apr 2026 10:42:08 -0700 (PDT) Received: from plex ([71.181.43.54]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8b02ac78513sm164398756d6.19.2026.04.23.10.42.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260423_104211_021269_20BAEBDB X-CRM114-Status: UNSURE ( 8.48 ) X-CRM114-Notice: Please train this message. X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org 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