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Wed, 5 Nov 2025 17:04:08 +0800 (CST) Received: from kwepemj100009.china.huawei.com (unknown [7.202.194.3]) by mail.maildlp.com (Postfix) with ESMTPS id B94E1180044; Wed, 5 Nov 2025 17:05:41 +0800 (CST) Received: from DESKTOP-A37P9LK.huawei.com (10.67.109.17) by kwepemj100009.china.huawei.com (7.202.194.3) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Wed, 5 Nov 2025 17:05:40 +0800 From: Xie Yuanbin To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v2 0/2] x86/mm: support memory-failure on 32-bits with SPARSEMEM Date: Wed, 5 Nov 2025 17:05:36 +0800 Message-ID: <20251105090536.11676-1-xieyuanbin1@huawei.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <57936358-69b0-4028-a0df-b5f5acc32ca9@kernel.org> References: <57936358-69b0-4028-a0df-b5f5acc32ca9@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.67.109.17] X-ClientProxiedBy: kwepems100001.china.huawei.com (7.221.188.238) To kwepemj100009.china.huawei.com (7.202.194.3) X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C5CABC000B X-Stat-Signature: 1cfdbmy56j8shccppkztwx5x8zuzmm1s X-Rspam-User: X-HE-Tag: 1762333545-642163 X-HE-Meta: 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 J2CR+K6t xiHle3YPXvl3Kqc42TdHKP4KOEzo60RM9DwivB04R+wkbYkbY3tIIVcj2o7Tz800jIMWenL2iTVbtHJ5Ye2kIJbMI5eWJnyk+Ofdyn3DWhB5OSKFqN39wqFvgAborQQBArO/TQ7dJGvWiiI0otRkhaKAjXSCxkabHqcZ0DbJpX6AkNrz4y+5aO+/xj8p/ANF6XHEDtHm2rUNhCiBRzIyulhgnN+A00Hur/buC/rA+n76Ldvqa4aBbHfU4cXyJw5SQADr3A+O4dIOAPKYqpirfav8NYM4GyeYtyePPM2qRw/r1+h4PcSgem6C1QjFQvH4MH7pYVLWCb2UgiQ8Uz9oLG2lg6yX+xuUHBOm3Xf91mhu+/yUiQzV50snY1Stf/ag3vKtM 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 Wed, 5 Nov 2025 09:12:04 +0100, Dave Hansen wrote: > Let me clarify what we need to know: > > Will you (or your employer) be running such updated 32bit kernels on > hardware that supports MCEs. > > In other words: is this change driver by *real demand* Thanks! Asking like this, I completely understand now. We won't directly upgrade the kernel to 6.18.x (or later versions) to use this feature, but if Linux community approves these patches, we will backport it to 5.10.x and use it. I know that the page-flags in 5.10.x have been exhausted, but we can work around them by adjusting SECTION_SIZE_BITS/MAX_PHYSMEM_BITS to free up a page flag. Another patch I submitted for arm32: Link: https://lore.kernel.org/20250922021453.3939-1-xieyuanbin1@huawei.com , follows the same logic. Currently, there is a clear demand for ARM32, while the demand for x86 is still under discussion. > or just by "oh > look, we can enable that now, I can come up with a theoretical use case > but I don't know if anybody would actually care"? It can also be said that way. In fact, when developing the demand "support MEMORY_FAILURE for 32-bit OS" in version 5.10.x, I found that the latest version already supported this feature, so I submitted these patches, and hope others can benefit from it as well. > Cheers > > David Thanks! Xie Yuanbin