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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a0017998dbsm117774805e9.14.2026.09.27.12.20.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2026 12:20:17 -0700 (PDT) From: David Carlier To: david@kernel.org Cc: akpm@linux-foundation.org, axelrasmussen@google.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, baoquan.he@linux.dev, brendan.jackman@linux.dev, dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, hannes@cmpxchg.org, jan.kiszka@siemens.com, kasong@tencent.com, kbingham@kernel.org, liam@infradead.org, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@suse.com, osalvador@suse.de, qi.zheng@linux.dev, rafael@kernel.org, rppt@kernel.org, shakeel.butt@linux.dev, surenb@google.com, vbabka@kernel.org, weixugc@google.com, yuanchu@google.com, ziy@nvidia.com, David Carlier , devel@lists.crash-utility.osci.io Subject: Re: [PATCH v2 10/13] mm/sparse: remove SECTION_MARKED_PRESENT Date: Sun, 27 Sep 2026 20:20:13 +0100 Message-ID: <20260927192013.144672-1-devnexen@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260921-b4-sparsemem_cleanups-v2-10-54d81d65e125@kernel.org> References: <20260921-b4-sparsemem_cleanups-v2-10-54d81d65e125@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: CD781160006 X-Stat-Signature: gopj3dm1y6uu34p4qyycs8gfqwqugjco X-Rspam-User: X-HE-Tag: 1790536819-803654 X-HE-Meta: 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 /VWscniZ yIQxmLDuQrwsMZUNxNdQUrwjzQN1s0kD5MOx9fx/Bxv0QWjVBTimleTX20kwsq3CoETSdFx1K4P3K/gLynfUU9zfgjYwS8Fu9cjcSQ1gGd9qGuXtSkXyPz7hvZIlcdvgCQjt/mBI0anJkxDm6rrgQNtVBX3yMgu+CtpXbC1dJYGN6lrue3KxfWfGkyPgOpMdiDDL8UCYuPiWfrwAH/vYR9zu6VlBL8b/jcBpMiXZBZefqVXSULA2RsPZjaniulfBf8pR5UwkQOStXR2wYeHsGjSFfAib2/8GUNq6mcCrUGfHfECQ0UYl/pllYcvMxCxq1Hr8OGdJuiQuVMbgPKfzLh4O6TlWt+xpqmsqEYw4zO9Y5/lggPYB02fGI8aLSc+NEsq9EE0B9SL7ELHF/sN8ZOcq8VSJ0sAsI+/UW6y6fcRY6P/FfmpnzhKJrJw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Sep 21, 2026 at 09:59:02PM +0200, David Hildenbrand (Arm) wrote: > enum { > - SECTION_MARKED_PRESENT_BIT, > SECTION_HAS_MEM_MAP_BIT, > SECTION_IS_ONLINE_BIT, > SECTION_IS_EARLY_BIT, Hi David, It seems dropping SECTION_MARKED_PRESENT_BIT shifts the other section flags down one bit. crash hardcodes SECTION_HAS_MEM_MAP as (1UL << 1) in pfn_to_map(), so it now tests SECTION_IS_ONLINE: offline and ZONE_DEVICE sections no longer resolve to a struct page. makedumpfile only checks bit 0 and is fine. Keep bit 0 reserved, or export the bits via vmcoreinfo? Cheers.