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t=1781773610; bh=Mm2lCLjyWnzab/19VrsoxJklGw/Bkp1asQyZBrJBDYI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=NTPXEK1coiBSBjmD8O0cGT1hnThEAQZYPGEV+zyV64VPw9bhOyvwG0t08rqMvHgS1 hQgDCfY0v/Ut0fEGpJ4sHxd6BZlFt1H85YSkMAekx6uICbKOihbRkK/QfFtjS522lT kyZbIy9TdWpui+Y6bme8aHFIdzK618zLzld/ejX2TLQnAHHseUvFC4JsCCR47qimU9 RLNvVIEAnLm/qBOlFOwOAxB9Yfc9TwYvA1VIVnChBhcG8ekVj5kaD1tte635ZpPIst 2Ae2tVr1+0AIguIFyPElLKq5yhzxWhaIH+iqim3Z0mVWYfuCdlV2mkqeCW4hPXl552 jW2MZWTphKC5Q== Message-ID: Date: Thu, 18 Jun 2026 11:06:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 1/3] mm/huge_memory: make persistent huge zero folio read-only To: Xueyuan Chen Cc: dave.hansen@intel.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, catalin.marinas@arm.com, will@kernel.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, hpa@zytor.com, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, yang@os.amperecomputing.com, jannh@google.com References: <3b20ad2e-bb69-44be-bad3-5efeb169c573@kernel.org> <20260617141547.144275-1-xueyuan.chen21@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 57EA3C000E X-Stat-Signature: 3rbrfjxfpzcbfr9t7bsoj6iizho4g5m5 X-Rspamd-Server: rspam03 X-Rspam-User: X-HE-Tag: 1781773611-859876 X-HE-Meta: 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 s9FjOAGc CWSQS8V2h8vmtpyY6XOvPxEOhrAb0ssiRtUONuG9/pBlk+BW6ZCfBJSUhNv0dHmrhQSd3VeHatjdXvNfJMA0zv6GuE1MYGpJOD3wvDZ+Z71cR9oqvK/StJek84iGoda0jwWzicpbhwNZZdnBAMLd9qCTKmxjYCfZvHmXbVwby3tLDhi+0800NxpkZcE31n0rwflZaWpl78SODmyk/DEpH8Qb4NxL37oYtcXs4F8wqcSXVYuRL+AgxaHIXkN1erzbwlth3Q7eRetBlyPY6NHJD8B35DNyjedd+nqViAPSlx7R9dBjFb9e1/G8BMr6E42MUOpXw1PtPOb0pOnR1d+cGYf+nAU4AIgCumrckGnsvfTu1jwZUd8NVH/dv8Jzl5qcW8wfL Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/17/26 16:15, Xueyuan Chen wrote: > > On Wed, Jun 17, 2026 at 01:50:08PM +0200, David Hildenbrand (Arm) wrote: > > Hi, David > >> Yes, kerneldoc please. > > Ack. > >> >> We're adjusting the directmap, remapping a r/w page to be r/o. I think we should >> be very clear about which transition we expect+support. >> >> Also, I rather hate the "set_memory" naming scheme ... "set_direct_map" is >> clearer. Anyhow ... >> >> Now we are throwing a "arch_make_pages_*" into the mix. >> >> Should it really contain the "arch"? >> Should it really contain the "make" ? >> >> Why can't we just reuse set_memory_ro and pass address+nr_pages? (highmem check? >> Could that be moved in there?) >> >> Or do we want a "change_direct_map_ro()" / "remap_direct_map_ro" interface? >> >> > > How about naming it int set_direct_map_ro(struct page *page, unsigned nr)? To distinguish it from "set_memory*" cruft, maybe best to use "remap" or "adjust" instead. -- Cheers, David