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Tue, 10 Mar 2026 11:30:55 +0800 (CST) Received: from kwepemr500001.china.huawei.com (unknown [7.202.194.229]) by mail.maildlp.com (Postfix) with ESMTPS id F058D40538; Tue, 10 Mar 2026 11:36:31 +0800 (CST) Received: from [10.174.179.248] (10.174.179.248) by kwepemr500001.china.huawei.com (7.202.194.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 10 Mar 2026 11:36:29 +0800 Message-ID: <0dc36f64-3e6c-4e4b-bdd1-6e364babb0bc@huawei.com> Date: Tue, 10 Mar 2026 11:36:29 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v3 2/4] mm/pgtable: Make pfn_pte() filter out huge page attributes To: Matthew Wilcox CC: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Kefeng Wang , References: <20260228070906.1418911-1-yintirui@huawei.com> <20260228070906.1418911-3-yintirui@huawei.com> <5eaf3846-01db-471e-9903-b0b239d7838d@suse.com> From: Yin Tirui In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.179.248] X-ClientProxiedBy: kwepems100001.china.huawei.com (7.221.188.238) To kwepemr500001.china.huawei.com (7.202.194.229) X-Rspam-User: X-Stat-Signature: k1z6ttwuchrgoa6uphdyrua5wm3jtkhh X-Rspamd-Queue-Id: 76EF3100007 X-Rspamd-Server: rspam03 X-HE-Tag: 1773113796-647174 X-HE-Meta: U2FsdGVkX19c5Xi/CBeEVb37WMAZCAPHzN5CFFO/Obif56jaZdY13vINZCEGA3uWVwXlbFJjSevuEt4jMWoHysm7SK05HDC8U7s0Gx8fopcWwfCUYzkTqIaMfI4Qe5Q93i19COcgqdWNanBWe1jeiGYWbfXscXgYztOOnwQiGVrLs6HZIBwCj7aPVNChY0UUQGc4jb6gavfDb5iIyirirIRfPYNvxjksuZQMsr4MDUeL1428UURh0u8SyW3ykUi7sM5pqc/BLBuHS0nZaqb3dhkGSGgznCFsAtY3wmqhLGijhA+11VIRh8RDhAUeNWBsTdS6QNrviz+htoQ3x95Eyo2NrjyjxMVfw4yGHVWyAilrAHpod0AiJD1VvfUzPbW/ezlFOg4+B/a7AGBom3WsuEcU9dchuSo3YeecccYOBZJwPP52uB+k3nx8QjLQhJ7RU9NK4uh5uF1WOJ0OCGwXOZdoyUobdZCZwwbGPsNFQKjhUq4W4oMvKg5K0TqsyO60NFgt8mCl67q77XGcOfhZ4mDbz6p7FBWy+vmUVvUQ4+nlGqQ4BBQzGDvjyAKXH4Y4/zm+LD05Qt1JVV+ShjzS5l4kRDXPF66Cp4CA2C44Z9r3dgS57R16jCnhwTZbAeVO1UMASYTHNNki94dEvu096Di/WkH9Hq+vsimmSRWFcYgTU4BB7+ntFnqRJx9SH4ffv0EoOF0k2a305RMKoE44h1yVCyiWDPIY+V8gVTrYhFHVVrIEifjpDrim746aPD4TqWt/epDuLnFVzJEgnHvLrDsglSDaS274aSp/fGhCI1zdEvk1pCwjH1LW7XKqECt1Eoaz827GIaKoRANn55pmg2RyiEXqOShhZepQOfIPoaF0TSlnT8DRJIELQWSwqDgezJR4KAXRpNRTkdIHviMcpYFfCb507IUNhLLE1tV8ZuD6tHIuCWnAZz6S96F1WerdSLTDa0vE8hFegFLJoHX raSdpQlQ rNdhabQY9pZWmOq/+pRvy9jPI+bRdFEVwW9VyZDHHDgcCMRhQPELrZbz+h0ftK5yFCGS4gAv2n8DYwwTmK04XD7E54zUI76qGWwF85YmbzsMzU/ytvSVXm3hqHvUHlsx7OH/ZWMzUb065hO+21cgFe8qQ73i5/PePgnGlF+douJkKwcEZLsowIegdAblkfBovBk8BlszMgMxFdSAwQCoikrYNLxiQBn7WPx1hypK2hW0KLp00ryyw4KX+ru+QdJmDXOwmSqbFlacK0uiWqGV7/Y3w6VhKmMceWT3nYuHFOJrSRaCQ22rDLKBUYwvE/Z3eJTB3+l1P7UyRcPw/i6LwiOtFgMRd+vBmMmTAvdA0f+cpEEU= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/6/2026 12:25 PM, Matthew Wilcox wrote: > > I don't think we should have pgprot_large_2_4k(). Or rather, I think it > should be embedded in pmd_pgprot() / pud_pgprot(). That is, we should > have an 'ideal' pgprot which, on x86, perhaps matches that used by the > 4k level. pfn_pmd() should be converting from the ideal pgprot to > that actually used by PMDs (and setting _PAGE_PSE?) > Hi Willy, I will take this route and implement the embedded approach for the v4 respin. -- Yin Tirui