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b=bbzqqgYDJaQzrCs8odQyzCSqhRwcmyL1ScaEN1/EvV8yt15TkSLXSG06xagX7ROA9 S5GrDl+xfuQYxN8nXIEWX90ehEFAm/sxQ0UbtYVqsAIKRLpi7KFD83TjjgaAEgL+Ih orRIFhBmHouoMfpe41uiaXXuBlM5McRT8VZkv0q3WDt7YHq/WGOQlnyztXBKtavsYA e1uFC5yRv1oxG5qxnhsTlNU19ROFHvtR2S0t+cHwsPe3IRGjYNLoFDwpFBZOZR0jJO gT/W+2kyHJrimY22ExgTLGQNtw0vs9XJsIpC81enpf4ZgdsclBKJnrxwUcnr/l2TL1 ZJEd/fFXzRP8Q== Message-ID: <4382c90a-bc92-470e-9aa7-4666753479ca@kernel.org> Date: Wed, 8 Apr 2026 14:29:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC V1 14/16] arm64/mm: Enable fixmap with 5 level page table To: Anshuman Khandual , linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , Ryan Roberts , Mark Rutland , Lorenzo Stoakes , Andrew Morton , Mike Rapoport , Linu Cherian , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20260224051153.3150613-1-anshuman.khandual@arm.com> <20260224051153.3150613-15-anshuman.khandual@arm.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-Rspam-User: X-Stat-Signature: 56oqn3pscazfphmhzi717jsmfeq3zugc X-Rspamd-Queue-Id: E74724000A X-Rspamd-Server: rspam09 X-HE-Tag: 1775651388-586043 X-HE-Meta: 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 2WefULL1 u06/so5upYasLnx4y6WgMEDJS61xBB2JkHEdMqR9KeYZ+7dZkIbZMGi5b4WDeHyizMdsKqkos4Pe0ZLmTXI3JozH1+hfzY6OlTPnD8sq6DAm+U8510tlgyOS7Qv+T3pW5oe2ZxBZAy6mx3338nXpJNHfptVz/4GvRRyVHn5vbxWFHLxQZpVsiX3ChvSWSM2Bs7VMlhzHDbNuzBCQfaCoQTgU5b+9C6vw8JcBV Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/24/26 06:11, Anshuman Khandual wrote: > Enable fixmap with 5 level page table when required. This creates table > entries at the PGD level. Add a fallback stub for pgd_page_paddr() when > (PGTBALE_LEVELS <= 4) which helps in intercepting any unintended usage. Can you add the "why" ? -- Cheers, David