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b=Y48yIR677BPTn8wzenQY15Cy8LxN5kt7WPJJXzr1lKd9Lk1jv2GwGPBAThNIpO2Ye AdtpFceEHKJru/iCf+mZUf62f5m8sE6Y4JKBj5eS3GALtSND+fkQXahsZBb6xKnKp6 Mf3saSepeov0+zKGvO6pUHcZmP1mK4lyuRrkVjbxBuitOqyOV7i7W8XfgQ5ZzFZMKl PANBDADHEJkHKi47hf8hrKMD4jFW8+WMBHuLluRYZQxdVIb4uyyqYy+UzCTnnfNnnH Kf20oN9hYLO3vKWFOKHqAIr3Bb86x6Ek+VaZKTQ9VMCqiU2+2aVVsxFHOLDXkDJ2Ow scZoKtxrgyrlA== From: Pratyush Yadav 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 In-Reply-To: <20260423122538.140993-2-mclapinski@google.com> (Michal Clapinski's message of "Thu, 23 Apr 2026 14:25:36 +0200") References: <20260423122538.140993-1-mclapinski@google.com> <20260423122538.140993-2-mclapinski@google.com> Date: Thu, 23 Apr 2026 18:43:04 +0200 Message-ID: <2vxzmryt631j.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Stat-Signature: kmmuyc5phbumj41mz964px3c3ikhsxsk X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 9F93920005 X-HE-Tag: 1776962589-433439 X-HE-Meta: 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 X83rjJFk Rc5jP8d+1cwIvcjmcKSCGDOXsTVZ3CIXBuP8BKjo5Z78UyekQctJ16Qe0/HrTEotkT90QEGKdHVyRLKoZ/TbRtNo7qGvsmzCfbeYGhgrhzsFQYCwDZ8KsXs2K4KuoAVn7U8kyoepyeVQk8lXibsFZfkKKE+gmkkmBI7H8DBUWGCwlf0/DdByQ1vwQLCqwZPMZcV5b/NTv2JBa3y5rgEVmxRwI9M1pF4w1vh+3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Apr 23 2026, 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: Pratyush Yadav (Google) [...] -- Regards, Pratyush Yadav