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b=NwhdPR1sQ3ZoUnZlrIxUVrKB75sTS+u5BMLJYzTiw8DHZLnHa149ZeMmIPmpVxslx d0Glgm3v9q1C2jpHLfQcgOht5t39wgfNIE9OLdWSzM38uFv6jcgqpEK7IlT971atxk H5x3YcxK8pPCbJe51ZHiK4uUZSuvD/qoMvz+tZwdFCg/bCjVwamuT4kw8AF+qu3Twz dQqmpu2r4wbENxBUI0pQSUYaVSVefcYvjVQehOjuzNHVMgpYD2vn2iOUU/e7hA+BGT 2W/hIf7OK7MdyBSc8oveB5qyRAwEW0oWQWU7Ag5VD6TXeinGZfZianBCBhdJ7XvFNs l9ZAuUKP4cHCQ== Message-ID: <5dbd012e-52cd-40cf-b9af-59787e2832b8@kernel.org> Date: Mon, 20 Jul 2026 09:20:11 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/3] mm/memory: batch set uffd-wp markers during zapping To: Dev Jain , akpm@linux-foundation.org, ljs@kernel.org Cc: kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, riel@surriel.com, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, ryan.roberts@arm.com, anshuman.khandual@arm.com References: <20260720065508.2695106-1-dev.jain@arm.com> <20260720065508.2695106-3-dev.jain@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-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: B4C33180003 X-Stat-Signature: 1uxe5uqhanymdq3ck3aocfoid3b7ooen X-Rspam-User: X-HE-Tag: 1784535619-323978 X-HE-Meta: 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 oVaASBoL GgoDgP1qezIdT7pJSt5RSRz//rAAh0Zk997WEHs5xcCrI5WV89JhtW0Y2mK+/BSjGXUoCNFk65iDILrc9iUlDLRKtmCsKRGM5UMVVzqi3xZPEW5Z5Y1cGAscDpilU5SVUzCqu5/7oLiRNCt+KMVfLmsnp4hG4xm4V75Q47geO4uJJz+XeZZRO1r2HE8C42Bzk0wKPz7d86NtXmEimAsYAx/rpa7baardALq5YDGDCP+BkTr3rsziywFLuwVRmHaN+Fhh827KNE7nj9r0mp+2myEIC/hD+IZmpKZRnoohw+Zx56ZnZT9ACLqj473Yq8prL7U9BrSi6CHvRE4xUEAlThdfqbQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/20/26 07:55, Dev Jain wrote: > Enable batch setting of uffd-wp PTE markers. > > The code paths passing nr > 1 to zap_install_uffd_wp_if_needed() produce > that nr through either folio_pte_batch() or swap_pte_batch(), therefore > batching is correct: > > 1) All PTEs belong to the same type of VMA: anonymous or non-anonymous, > wp-armed or non-wp-armed. > > 2) All PTEs are either marked with uffd-wp or not marked with uffd-wp; > the same applies to the pte_swp_uffd_any() check. > > 3) uffd_supports_wp_marker() is independent of the function parameters. > > Use set_pte_at() in a loop instead of set_ptes(), because set_ptes() > cannot handle nonpresent to nonpresent conversion for nr_pages > 1. > > Rename the helper to cond_install_uffd_wp_ptes(). > > Signed-off-by: Dev Jain Acked-by: David Hildenbrand (Arm) -- Cheers, David