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 AC9173C10BA for ; Thu, 10 Sep 2026 07:33:19 +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=1789025602; cv=none; b=bMdW+17QsjdJTLUEzyngC67lIz5yHdGzK049PzMGG1Gp5hOb2vFZZgproOfo3AcgOBdb5xDPkKCEYrLJqTqH6mx9ldk6xnrStensjciQm8iXJoIFLMX695/ZYNc3+Dr+c46mcpTNOXgITN1pmQlFGa6/u+m5ZJpXlRukjHUD+dU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789025602; c=relaxed/simple; bh=KSEwErLLZBwKeHY1pLCDRQJVkYShi+ucFN2VHCxzGsQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=I5iOUXG5imNnJT+ZBKWPwHSRuntOPdfrzmnafOM5y4z3IBXfNQBt1osq4noley5aQRUXM7AhF210acvffvir/XvYuVoJNq4RJaovvicipWhfSAu1j/sy9RzFqTPfm1OesijTuAp4YtgNfM7r3ZQIZ7eZS9tTZN4S/B/42yc1jvc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IGTBRL39; 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="IGTBRL39" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D98C81F000FF; Thu, 10 Sep 2026 07:33:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789025598; bh=czh8IcADH5q+j25/l/hsdYEPqXsQdtzVs9zbnn25Avk=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=IGTBRL399qvUpxmFxt2OFj5h3OTsHkvcF6R9C8EZIxMtupmNmI8IGB+84AWqGb8ZA NMzQMJ1cDzUknYLC+BHFZAcz9DkqOlM5zo/7v/cadMqNurU5ynMEoMZNoXwxpm0u7N Y9h4aOWI/TcI2gz8IqnDLhfSnUPTJCWARQCaIgkl5rH0xZDBHfz93hJAE0JCXuwLG4 uQc80RdpyrQMpoqN0c89DNjX+whZEOVw8dX9TsLkF611KDBwRPrTTyahwYWSeTjNp3 14akviQhN0dQbBMkm1LJdo6sCWfe6DwH34PiQ6xZudu3HY30JpmPuMMjFSjSlbBm5+ 9mg2Z2PEQFopA== Message-ID: <401e3beb-e2c5-4241-831c-005ccfb22e34@kernel.org> Date: Thu, 10 Sep 2026 09:33:09 +0200 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 v7 1/3] mm: make persistent huge zero folio read-only To: Mike Rapoport , Xueyuan Chen Cc: akpm@linux-foundation.org, ljs@kernel.org, usama.arif@linux.dev, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, kas@kernel.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, luto@kernel.org, peterz@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260901151818.3191443-1-xueyuan.chen21@gmail.com> <20260901151818.3191443-2-xueyuan.chen21@gmail.com> <1d5ac9d7-48ce-4fee-b893-f646bade4a86@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 9/10/26 09:24, Mike Rapoport wrote: > On Thu, Sep 10, 2026 at 02:22:25PM +0800, Xueyuan Chen wrote: >> On Wed, Sep 9, 2026 at 11:18 PM David Hildenbrand (Arm) >> wrote: >>> >>> >>> I think getting something consistent for now is the most important thing. :) >>> >> Hi David, >> >> OK, I'll move the highmem check into set_direct_map_ro(). > > Consistent means leaving highmem check in the caller ... > >> Should I also update the x86 set_direct_map_invalid_noflush() and >> set_direct_map_default_noflush() helpers in this series to skip >> highmem pages? > > ... or checking it in all set_direct_map functions. > > I'd keep the check in huge_zero_init() in this patchset. Agreed! -- Cheers, David