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charset=UTF-8 Date: Fri, 26 Jun 2026 14:38:29 +0000 Message-Id: Cc: "kvm@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mm@kvack.org" , "bpf@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "kernel@xen0n.name" , "linux-riscv@lists.infradead.org" , "pbonzini@redhat.com" , "corbet@lwn.net" , "maz@kernel.org" , "oupton@kernel.org" , "suzuki.poulose@arm.com" , "yuzenghui@huawei.com" , "will@kernel.org" , "seanjc@google.com" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "luto@kernel.org" , "willy@infradead.org" , "akpm@linux-foundation.org" , "david@kernel.org" , "lorenzo.stoakes@oracle.com" , "vbabka@kernel.org" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "ast@kernel.org" , "daniel@iogearbox.net" , "andrii@kernel.org" , "martin.lau@linux.dev" , "eddyz87@gmail.com" , "song@kernel.org" , "yonghong.song@linux.dev" , "john.fastabend@gmail.com" , "kpsingh@kernel.org" , "haoluo@google.com" , "jolsa@kernel.org" , "jhubbard@nvidia.com" , "jannh@google.com" , "pfalcato@suse.de" , "skhan@linuxfoundation.org" , "riel@surriel.com" , "ryan.roberts@arm.com" , "jgross@suse.com" , "yu-cheng.yu@intel.com" , "kas@kernel.org" , "coxu@redhat.com" , "ackerleytng@google.com" , "yosry@kernel.org" , "ajones@ventanamicro.com" , "maobibo@loongson.cn" , "prsampat@amd.com" , "wu.fei9@sanechips.com.cn" , "mlevitsk@redhat.com" , "jthoughton@google.com" , "agordeev@linux.ibm.com" , "alex@ghiti.fr" , "aou@eecs.berkeley.edu" , "borntraeger@linux.ibm.com" , "chenhuacai@kernel.org" , "baolu.lu@linux.intel.com" , "dev.jain@arm.com" , "gor@linux.ibm.com" , "hca@linux.ibm.com" , "palmer@dabbelt.com" , "pjw@kernel.org" , "shijie@os.amperecomputing.com" , "svens@linux.ibm.com" , "thuth@redhat.com" , "Liam.Howlett@oracle.com" , "urezki@gmail.com" , "zhengqi.arch@bytedance.com" , "pavel@kernel.org" , "yangyicong@hisilicon.com" , "vannapurve@google.com" , "jackmanb@google.com" , "patrick.roy@linux.dev" , "Thomson, Jack" , "Itazuri, Takahiro" , "Manwaring, Derek" Subject: Re: [PATCH v12 01/16] set_memory: set_direct_map_* to take address X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: "Brendan Jackman" To: "Lorenzo Stoakes" , "Kalyazin, Nikita" References: <20260410151746.61150-1-kalyazin@amazon.com> <20260410151746.61150-2-kalyazin@amazon.com> In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Stat-Signature: prh6tt5pkjg8g5yqxty79uxkk94xs38i X-Rspam-User: X-Rspamd-Queue-Id: DDDA1180003 X-Rspamd-Server: rspam02 X-HE-Tag: 1782484730-929497 X-HE-Meta: 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 wnGvH5+E 8JhQfAkZgRr7J9uee5xn2gRUNP8d11t9Rr/8+d2gNup8ULi3GKONaYmrfrKcplBRPUGHiFsmDXfJaPVmx+kWMiriYggozvppjvj1i8z2tcPbQ8aLOHiu53CthMAuGUWGU1UhdSFvpI0TnVWkHf+9SwixXTsZuB/4cKvgh7sBGxmETQghkAR61vXonQ5XgPLKatY1LyJRW8/Jljke68QejpklEGWQghOScc57CqW8Cf7WeZ57mx2SIGbWDGp+vGnMpuC5yoyEuSsaSnUNwNnxFuL3P//oS12lO8w++vr6y4+MaQ0va1nPVkAbBOsqj9xY8PY6NJ6eAb4NoviTSBqzwo9IQeqjwrYhSrJvnByYNlrUaYKDUtPDLNAi/aZAZWY3IYa3Juc9xiKQCzOSiCf1JbBHYuw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue Apr 21, 2026 at 2:43 PM UTC, Lorenzo Stoakes wrote: > On Fri, Apr 10, 2026 at 03:17:58PM +0000, Kalyazin, Nikita wrote: >> From: Nikita Kalyazin >> >> Let's convert set_direct_map_*() to take an address instead of a page to >> prepare for adding helpers that operate on folios; it will be more >> efficient to convert from a folio directly to an address without going >> through a page first. Why is this more efficient? Isn't it a purely compile-time conversion? Indeed in the current implementation folio_address() is page_address(&folio->page) so it still goes through a page anyway, no? I might be missing context here about how this will look in the memdesc future. 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From: "Brendan Jackman" To: "Lorenzo Stoakes" , "Kalyazin, Nikita" References: <20260410151746.61150-1-kalyazin@amazon.com> <20260410151746.61150-2-kalyazin@amazon.com> In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260626_073902_183263_71C7F81F X-CRM114-Status: UNSURE ( 7.28 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Tue Apr 21, 2026 at 2:43 PM UTC, Lorenzo Stoakes wrote: > On Fri, Apr 10, 2026 at 03:17:58PM +0000, Kalyazin, Nikita wrote: >> From: Nikita Kalyazin >> >> Let's convert set_direct_map_*() to take an address instead of a page to >> prepare for adding helpers that operate on folios; it will be more >> efficient to convert from a folio directly to an address without going >> through a page first. Why is this more efficient? Isn't it a purely compile-time conversion? Indeed in the current implementation folio_address() is page_address(&folio->page) so it still goes through a page anyway, no? I might be missing context here about how this will look in the memdesc future. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv