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b=vMzj4MYKtAiqJ6RLff4zJDABl7+halshmCh0EvHM/8X2HgrGzphOmm/IaTDLL2HEf p/9fD1tMNFp222OgdU2zOCRlhTlG1kDFeqYBoKW52i0oegKOaJ8nlfMprSIcYMsyW1 hwW7EUpyvJUayUv6fvRpQ1ViC3pJtLfUsXYSMuNMQyJ8gcKVZh04FkyCfRClMXX3Gk 1dIlONxzZo0i7Oe9+E5qtuou5p4mAtt/K2wF2pCxM+pe0jJT2VEL960qR8Q4l1yeew p96p4fQVsGo7jz/LkVhj4gAqLH3vvZbuA0bUSwt85euHZ8Uum/sFSH+zLERjXHR5xn 6PyU2iGEfGhdw== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: Chunyan Zhang , Palmer Dabbelt , Albert Ou , Paul Walmsley , Alexandre Ghiti , Andrew Morton Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Chunyan Zhang , Alistair Popple , linux-mm@kvack.org Subject: Re: [PATCH V5 1/3] riscv: mm: Prepare for reusing PTE RSW bit(9) In-Reply-To: <20241113095833.1805746-2-zhangchunyan@iscas.ac.cn> References: <20241113095833.1805746-1-zhangchunyan@iscas.ac.cn> <20241113095833.1805746-2-zhangchunyan@iscas.ac.cn> Date: Thu, 30 Jan 2025 09:42:21 +0100 Message-ID: <87frl0snf6.fsf@all.your.base.are.belong.to.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 26B161C0015 X-Stat-Signature: 4cxg8akfp4qnneubk1ggrkwb6q1uzztf X-Rspam-User: X-HE-Tag: 1738226545-949288 X-HE-Meta: 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 tdrm9Lbu cEse5ITC6tUjAKjcVHLAlupGkWw/kphBSr63s4UNYAkyAQtz2x7iXCdA9vOSTR6hWn55Sh4XL3fWFCiOExXuO/X6JlSqyVjwWN+OJQyetV44S8v2kAxnf8W+fR0hx3fi8OkEdafb+kasqqagk3UkXcd1CHFFX8mqYwvZLiJEQ684lImE3ACBlj3Fareo53CpbZFolAv5b8IMVueZStvtyjHEOA6a35kzUHXz2b28tVEmwwnlLUhT9ntYhB6SjlWFNiTHSkfF+jdOovSAHWOaqqNyNkfhBBJ3GCB2p5fuVdRAQRlm844J1z5poJQ8EVvvdXs5Lnb86nDolIgfrlV+O4Nfck2SyKZjzm3dOlyomk6DJ11l/cTUM1gcIIGb4Z9yVrMvCpU7e63rI6kNymaQS0O/F7w== 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: Chunyan Zhang writes: > The PTE bit(9) on RISC-V is reserved for software, it is used by devmap > now which has to be disabled if we want to use bit(9) for other features, > since there's no more free PTE bit on RISC-V now. > > So to make ARCH_HAS_PTE_DEVMAP selectable, this patch uses it as > the build condition of devmap definitions. Heads-up: It seems like Alistair's series [1] that removes the devmap PTE bit will most likely land in 6.15. Bj=C3=B6rn [1] https://lore.kernel.org/linux-mm/cover.11189864684e31260d1408779fac9db8= 0122047b.1736488799.git-series.apopple@nvidia.com/