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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> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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.