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b=IGTBRL399qvUpxmFxt2OFj5h3OTsHkvcF6R9C8EZIxMtupmNmI8IGB+84AWqGb8ZA NMzQMJ1cDzUknYLC+BHFZAcz9DkqOlM5zo/7v/cadMqNurU5ynMEoMZNoXwxpm0u7N Y9h4aOWI/TcI2gz8IqnDLhfSnUPTJCWARQCaIgkl5rH0xZDBHfz93hJAE0JCXuwLG4 uQc80RdpyrQMpoqN0c89DNjX+whZEOVw8dX9TsLkF611KDBwRPrTTyahwYWSeTjNp3 14akviQhN0dQbBMkm1LJdo6sCWfe6DwH34PiQ6xZudu3HY30JpmPuMMjFSjSlbBm5+ 9mg2Z2PEQFopA== Message-ID: <401e3beb-e2c5-4241-831c-005ccfb22e34@kernel.org> Date: Thu, 10 Sep 2026 09:33:09 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 1/3] mm: make persistent huge zero folio read-only To: Mike Rapoport , Xueyuan Chen Cc: akpm@linux-foundation.org, ljs@kernel.org, usama.arif@linux.dev, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, kas@kernel.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, luto@kernel.org, peterz@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260901151818.3191443-1-xueyuan.chen21@gmail.com> <20260901151818.3191443-2-xueyuan.chen21@gmail.com> <1d5ac9d7-48ce-4fee-b893-f646bade4a86@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E2DDC140007 X-Stat-Signature: 3jpwetcxbr54qwbnxtfjxztfg7o6ro3j X-Rspam-User: X-HE-Tag: 1789025598-467989 X-HE-Meta: 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 t1WXLGWe BV1YtWe6EwzZOEMtgwGf6cU7BbndHAblmH/hJW+1tI17QnTzJxgRmBOgUVQo2swRvbu75sNLEcCTbxHMQXcMzpUMuETEb/Y464EOo86QKYrpKxEPAkryQAqTMiet3JpO93E4AL/bJGVBkrCJQSyda8nSDSowk4+iBmzBpD+b6wyNS9jaXZpsW3fRFq6koLjDAdGZlGUoBrHjsyWCnYtJ6urNvdPnYaQFXiczsu3X0GWBQ4re2/7FEm8JTGperEDcsUqp17fD8CH2NGsQZV8LE7rY1FnrnZYiavo56dXeBMh0iStOh934k0L9o8wnTPSrERKkfV5tMY7BVHVSA/q716XVUlhuNvY+fgoVMBUNHm8ncOKPBNcvDDncXJfOwjmkRK8VApLqAYIaK04vVykDwllNYAg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/10/26 09:24, Mike Rapoport wrote: > On Thu, Sep 10, 2026 at 02:22:25PM +0800, Xueyuan Chen wrote: >> On Wed, Sep 9, 2026 at 11:18 PM David Hildenbrand (Arm) >> wrote: >>> >>> >>> I think getting something consistent for now is the most important thing. :) >>> >> Hi David, >> >> OK, I'll move the highmem check into set_direct_map_ro(). > > Consistent means leaving highmem check in the caller ... > >> Should I also update the x86 set_direct_map_invalid_noflush() and >> set_direct_map_default_noflush() helpers in this series to skip >> highmem pages? > > ... or checking it in all set_direct_map functions. > > I'd keep the check in huge_zero_init() in this patchset. Agreed! -- Cheers, David