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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1767823606; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ozm9MQ8/GpOglg6lLvQsQe1sICFhCN9FKM8IHVaBqUc=; b=6/QnKlJwxS+S1jMHo9WTBp4oc8zYxoEi29yyCSXhQ9/csgys37/hwbyWADJeRAYnIdRE9A 1pcCBDY/0aQtjO+fNBLXk5L/nTNp7BquaS7LKYN0EHgJjidsa8FwabMu+qHYXSdcUEl8bw bbRCdiykWusnSMfOehPKRPzE1GQjKhA= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 257B560018; Wed, 7 Jan 2026 22:06:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83138C4CEF1; Wed, 7 Jan 2026 22:06:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767823605; bh=Nfvy1yrUUqnBfdePUv1Ij6X9WO9cx0Jz8V0B4zlU5/o=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=jFf6Jqxfric7rq6Q0NSYHZRHYcLnVM6W3Dy+iI1nnKMzxsAWBrGlUGCviBaI20rCw ysMFLuMEJ8KORtuB4b0ZFz33sWzLyEGbVuPhsgZKJisyI0OiQgm+kdo0tYJ8cPvKnU EwpEeDDl9twx1bJRu3WNd9E+6rcHum42NNe8kjkGEb/P0UDVrGgKTlCO58W1WQh+Uk NMwUZzTpKrgYQHTzBBNdYNX4dPJ1fp4iX55bhghSFV8funYyafzlZ3ag5gje1puIPk Jw1rWC+th7/Io9FbYJmcMfwbCa5IkhfHCR6VFDUM9dQ6nQsF8Fh+uJR7RTBK+yGGSb auvJVdOvWlcdg== Message-ID: <563a6f8f-7a8b-40a8-a553-a51c3e4b9a28@kernel.org> Date: Wed, 7 Jan 2026 23:06:38 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 2/8] mm: introduce clear_pages() and clear_user_pages() To: Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Cc: akpm@linux-foundation.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, mjguzik@gmail.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, willy@infradead.org, raghavendra.kt@amd.com, chleroy@kernel.org, ioworker0@gmail.com, lizhe.67@bytedance.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com References: <20260107072009.1615991-1-ankur.a.arora@oracle.com> <20260107072009.1615991-3-ankur.a.arora@oracle.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: ACB1C120004 X-Rspamd-Server: rspam03 X-Stat-Signature: hmotsi941ks9pauirsoftyh9tp4pnj5o X-Rspam-User: X-HE-Tag: 1767823606-121710 X-HE-Meta: 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 B672G5YG xAGRLJRXwIgaM7cJOkB6nKKvlfxNCf2SyyTsmFj9QGi1yIgb/krZwXZ6VbjzUiEdfWcJxYmA+p7Bb3szQ0x9TxVCAKVY+vxyuYYes1nVODv87OHF1VQN+a+D61Mae07Z/zy3z5pdm8yHcq0LXWBA7/W5GWC6n2FrNbDPSb1hsLsmxikYWM8KlMUY3Uj4oNJuJohW23uSHAVwQ0/wIBB+WlU8mcJ68nh9LJo/Dpr1Ppn/4X3Z+BHhLsw3UsA3v7NS8x9rm/WkuMkDbo6fmqMWr/zvkHlDcBXn381Uwpt5qR8DQpDkxfxLQyUEw+TlgeT8fI+AJGJylOQLRt/T16t5zFrdftrqYlcHvs3Vp X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/7/26 08:20, Ankur Arora wrote: > Introduce clear_pages(), to be overridden by architectures that > support more efficient clearing of consecutive pages. > > Also introduce clear_user_pages(), however, we will not expect this > function to be overridden anytime soon. > > As we do for clear_user_page(), define clear_user_pages() only if the > architecture does not define clear_user_highpage(). > > That is because if the architecture does define clear_user_highpage(), > then it likely needs some flushing magic when clearing user pages or > highpages. This means we can get away without defining clear_user_pages(), > since, much like its single page sibling, its only potential user is the > generic clear_user_highpages() which should instead be using > clear_user_highpage(). > > Signed-off-by: Ankur Arora > --- Acked-by: David Hildenbrand (Red Hat) -- Cheers David