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 BDCBA423168; Mon, 6 Jul 2026 09:11:22 +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=1783329089; cv=none; b=V7gZ1XXDIOMYdaAuyRFlAUHmE1AEK5v+hNkpCiyaygboLVWh58T/8FqgdD+1Aq0zEhCWrAwavEFiRyKOwoM/w9qAZAsl+WyB9oxhpxcW6KAFMXJvwwYI1zD3uM5rzlJdOmlYMTWsPakF+9dpq/T4OTLzeyL2W1lhTQApDHW+Xhc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783329089; c=relaxed/simple; bh=Yjvw/HVVmh70MVDhZySNDvXNJK4oCHdYgeZDhZvn3Ew=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=J1oweo1l7Zd/m4YyRh+Idj9IkoONHsFgXtiWLU8aY72JfngeP5mX14o2sHEgggLbpzOV3TReMAG97gerWoLiV0ct3PHGspcFvuAbaQVBwlznBUxg0Z64P8wLLicHh9vXnYknQUcBRq6Gdwf8ta9pS1oNLMKxLixdhynZRDpshtY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eG2rVnJC; 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="eG2rVnJC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A9FD1F000E9; Mon, 6 Jul 2026 09:11:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783329079; bh=QkFcj8l+oLXhC7aF9NZNqPGpSl0c31kzpzMlDAFV+QE=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=eG2rVnJCBidyUV6k5BBeWCCNM0F85/+WLTF1a2gL5CGxYgFLCFHCnWCFYkXxi2Gui gDSVgdzO8E6gbyBl1IAWNCCK2l/zOAT2aR1gsO7xQLSKCUDwFXdHcgwy1HRFT3xOCz eKZWz8qRLy6vOYo+YpPeOUkDqS9LlSYVzoaDIRTp+J36Z5Jg5J9M4glSVPaw1eG56j qViuc9HDHORqEf1JGyxn/2GpdcuorVLkLmARIVmJuOeYgO4vFWj0zNgi5cfqbVrP6x kvmaz3sd5ZdMQXmYDf0Her2yi6jY2CEtWmO+2AsD3bZmiL0pZUvfkuIR88Yax+Adve IU3CGjON99saw== Message-ID: Date: Mon, 6 Jul 2026 11:11:12 +0200 Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/8] mm: fix stale ZONE_DEVICE refcount comment To: Li Zhe , akpm@linux-foundation.org, apopple@nvidia.com, arnd@arndb.de, bp@alien8.de, dave.hansen@linux.intel.com, kees@kernel.org, mingo@redhat.com, rppt@kernel.org, tglx@kernel.org Cc: linux-arch@vger.kernel.org, linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org References: <20260701090553.62691-1-lizhe.67@bytedance.com> <20260701090553.62691-2-lizhe.67@bytedance.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 7/1/26 11:05, Li Zhe wrote: > The comment in __init_zone_device_page() still uses the old > MEMORY_TYPE_* names and implies that FS_DAX pages regain a > refcount of 1 in the free path. That no longer matches the code. > > Update the comment to describe the current policy correctly: > MEMORY_DEVICE_GENERIC pages regain a refcount of 1 in the free path, > while the remaining ZONE_DEVICE types start from 0 here and raise the > count again when the allocator or driver hands the page out. > > No functional change intended. > > Signed-off-by: Li Zhe > --- Reviewed-by: David Hildenbrand (Arm) -- Cheers, David