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b=PGyhIjarbZhWJGmZzoyZfOEFX1K1HB8r7leQuD14tOJfy5lSd677Lf2zesDORS9LO ek2K+6eBdolEAZF+QDuPHZsKz+sf6/1z2ajKAGoJDm2VuJAuOQ4Jkjvs2J+43dELMT 13dWAZXIceCdTr+0oYU7KiOHju4eO/jpZR1Bz9R4EQr5++52IP9KxO70IBhndYUd4o bbA0O+NRN/g78+FnLpO9D99nCncjFp+x0tp6ClKJyL2cPM4Qz55e0KZn+a7Ta8mj5d +51sCPR+TAKiXvHiWKdujpg+P41774+4RAn53/vFVxoZssSNCX3PmKqpRomOrSgHP0 uZn9f1fVfjCZw== Message-ID: <8044dc3e-5409-4767-b6ba-a75ccc7f1104@kernel.org> Date: Tue, 21 Apr 2026 16:12:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/6] mm: Make lazy MMU mode context-aware To: Kevin Brodsky , Alexander Gordeev Cc: Andrew Morton , Gerald Schaefer , Heiko Carstens , Christian Borntraeger , Vasily Gorbik , Claudio Imbrenda , linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <8809412aaed8a515fe2e149c822543d640060936.1776264097.git.agordeev@linux.ibm.com> <4dc47078-0f8b-4388-9715-744c18590a00@arm.com> <0dd3a5bf-a98b-4181-a88a-ec9c0203f90a-agordeev@linux.ibm.com> <566e7e6b-17be-426f-a3f1-a615d0d61077@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: 8bit X-Stat-Signature: md59eea9z6ozpwburg8i6t6zwaxmudm1 X-Rspam-User: X-Rspamd-Queue-Id: EB2DB180017 X-Rspamd-Server: rspam05 X-HE-Tag: 1776780779-156764 X-HE-Meta: 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 uamJoKOk g7ZWabwsfhNM+OR6k9kjxlaLaOlS4momtMbHzaELi4RoI5zIl560piuoK+084gk6YnCcHnFS0h+yxjniuurRdhcB2KbMAk2t+LszbTjigDSkaMqPRryKpFrfLzRYclz+GbyrZS01hRjBD9kiY1H9LZFbS/nwj5F0jWkYf4QsJM9/u5OBqaPk6TXZgY99e3VqSFvUFD3NhSKr2gRUwpxqaeIRSmCAKTNXTptFKIER5Hj6RZGjycW3HVNsRQw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/21/26 10:40, Kevin Brodsky wrote: > On 21/04/2026 06:57, Alexander Gordeev wrote: >>> Does that mean that all PTEs mapping [addr, end) must belong to the same >>> PTE page? I think the wording should be more specific. >> I tried to state that end of the range must not exceed pmd_addr_end(addr, end). >> Any of these sounds better? >> >> The PTE range must belong to the specified memory space and ... >> a) the address range must not cross the parent PMD address range boundary >> b) the PTEs must belong to the same parent PMD > > I think b) is good, maybe "PMD entry" to be even clearer.  My previous > suggestion of talking about "PTE page" isn't ideal since some > architectures have page tables smaller (or larger) than a page. In other code (e.g., get_and_clear_ptes()) we state "The PTEs are all in the same PMD." -- Cheers, David