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b=kWYajnxBp06uW/Fbs79kSGCpFkkJissFIjAueVxphZmrNwxcidb952mL7jDfxfeEM XJMcOLucCMvioxcRc3UuMhSygFZ8zEozO1os6GUUCJTgBUum6a2NOM8ycJBo5ZvRTh q4qL41VoYqesUXOIgnoz2xmQhohvfe/NCRDL5wM4+B6SkjG2MOumm3OV53+g5VcYQv Ey0IZONjjtkNzP6gyl/+Tqlhe8/uPT5DclF3GHsppa3KQJ96pMpc05bLsXTfHlyR57 BgWJpdf/tcA4ihoVrCkv2IXq5pvCtMkA2PH3WTW6bAMPkRrAoKbNn6oZhbldp6jDjX lisGYz+Rk0wDg== Message-ID: <1b316667-470b-4e1a-9c18-e42571e4769c@kernel.org> Date: Tue, 4 Nov 2025 10:33:39 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/2] x86/mm: support memory-failure on 32-bits with SPARSEMEM To: Xie Yuanbin , david@redhat.com, dave.hansen@intel.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linmiaohe@huawei.com, nao.horiguchi@gmail.com, luto@kernel.org, peterz@infradead.org, tony.luck@intel.com Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-edac@vger.kernel.org, will@kernel.org, liaohua4@huawei.com, lilinjie8@huawei.com References: <20251104072306.100738-1-xieyuanbin1@huawei.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: <20251104072306.100738-1-xieyuanbin1@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: A69A880017 X-Stat-Signature: qd5qhj5picc7ix9fgtbh6ydf9c4oboer X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1762248828-67789 X-HE-Meta: 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 FZ6Hff4W kBEq8ilhp6Ki8TWcQRGk2MO1dXWn5drNLLBvND/EFZ3pW7A5HRkCrKoZQJhmoIaU5H0meHCrXAkvUO7DjLCwNzpJAoxUU7/35uuW4R/CZxYfJUOiTJqco01BvdCu2C8Im9wsaEN0HQjgNmL+GSh8pgQcbF7TiDHCr4cwzMOVvs1PTPyQvk6CZXkmLTuUdGJsTy0Uafb4irSJdMSubdQZYY5vEW64RX8HCUGXf0HYio6Ot5SSRDQFc8pnJXPm9Ipxreq/+WdJ9lRaJ+ToRHzIgWlLYqLXpe51HXRGCc/5TOd5nfYU90KIYqTFv7jMMaZDCrdAPXBOyoWADYlXLrfXdJ+UI0EguM7BVleHttltjB3ubq6iHnRMwkIOiABA8IJ97Eykb X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 04.11.25 08:23, Xie Yuanbin wrote: > Memory bit flips are among the most common hardware errors in the server > and embedded fields, many hardware components have memory verification > mechanisms, for example ECC. When an error is detected, some hardware or > architectures report the information to software (OS/BIOS), for example, > the MCE (Machine Check Exception) on x86. > > Common errors include CE (Correctable Errors) and UE (Uncorrectable > Errors). When the kernel receives memory error information, if it has the > memory-failure feature, it can better handle memory errors without reboot. > For example, kernel can attempt to offline the affected memory by > migrating it or killing the process. Therefore, this feature is widely > used in servers and embedded fields. This is a pretty generic description of MCEs. I think what we are missing is: who runs 32bit OSes on MCE-capable hardware (or VMs?) and needs this to work. What's the use case? -- Cheers David