From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8D9DD389E05 for ; Mon, 20 Jul 2026 08:20:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784535622; cv=none; b=ZJb1Z9dfOs/tS+7psnPKh8c1ZyeZVVfBE+nxG8AUZzp6EZfst4Lz09S1Ihq4IoJDgDGC17fh0rnsE6hqOex+XVOZiilJeJZqM1/tbTJPIFc19PdsprpckP9nyTh4q7T9oYxGb7A2eMXdQ2GHOHfcXWe1tT+FMasc/SlI4XI//Nc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784535622; c=relaxed/simple; bh=xgk+IdR75CiTOX04vlbU2YHiTK9cQ9UW19yGtpn65E8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=L38H39UBqKncn4yQuGXwh8b+kpsKj2K5OFRDg90gKgyZk6hrMEQCO+W2jY4yES0Q9nXaHcQ6YpSRyJ+4x20NlSM4vJ3n5CrnAe1w3veUE1IwWuwERNKf4x77QVoHvznQJjBQbDOs9tqyxEPSRo90lIfMD3UjBQL4yBHpQKl2q4o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NwhdPR1s; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NwhdPR1s" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F02C1F00A3A; Mon, 20 Jul 2026 08:20:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784535618; bh=tzbgMbb/C78JO4vjePFx+V+5HdD6Ov2TmuXxqHSNuU4=; h=Date:Subject:To:Cc:References:From:In-Reply-To; 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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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