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Tue, 29 Apr 2025 09:36:35 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGrl8H4/5jtnrguKExXXuFCOERrcXvTboYVKeLXf20R7G+3egGDvxPBeabBwEPjBOiCsfK/vg== X-Received: by 2002:a05:6214:1c42:b0:6e8:feae:9291 with SMTP id 6a1803df08f44-6f4fcee30d1mr718716d6.24.1745944595247; Tue, 29 Apr 2025 09:36:35 -0700 (PDT) Received: from x1.local ([85.131.185.92]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6f4c0934346sm73501926d6.33.2025.04.29.09.36.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Apr 2025 09:36:34 -0700 (PDT) Date: Tue, 29 Apr 2025 12:36:31 -0400 From: Peter Xu To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Andrew Morton , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , Pedro Falcato Subject: Re: [PATCH v1 02/11] mm: convert track_pfn_insert() to pfnmap_sanitize_pgprot() Message-ID: References: <20250425081715.1341199-1-david@redhat.com> <20250425081715.1341199-3-david@redhat.com> <78f88303-6b00-42cf-8977-bf7541fa45a9@redhat.com> <75998f7c-93d2-4b98-bb53-8d858b2c108e@redhat.com> <57f9480c-2f8c-4be8-864c-406fec917eb1@redhat.com> <4a57e772-51f5-4341-a249-dd1b8fcf23b0@redhat.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <4a57e772-51f5-4341-a249-dd1b8fcf23b0@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: HcnsWCvPR3XEilSheYyI23rHY4O21iBbdFUEFxVSzAU_1745944595 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline On Tue, Apr 29, 2025 at 06:25:06PM +0200, David Hildenbrand wrote: > I do wonder why we even have to lookup the memtype again if the caller > apparently reserved it (which implied checking it). All a bit weird. Maybe it's because the memtype info isn't always visible to the upper layers, e.g. default pci_iomap() for MMIOs doesn't need to specify anything on cache mode. There's some pci_iomap_wc() variance, but still looks like only the internal has full control.. -- Peter Xu