linux-kernel - Re: [PATCH v3 7/8] arm64: mm: Set ZONE

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Message-ID: <6efd3623-e758-30a7-b798-c06a624bed4e@huawei.com>
Date:   Fri, 16 Oct 2020 15:34:11 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Ard Biesheuvel <ardb@...nel.org>
CC:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Will Deacon <will@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Linuxarm <linuxarm@...wei.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Len Brown <lenb@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        "Christoph Hellwig" <hch@....de>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 7/8] arm64: mm: Set ZONE_DMA size based on early IORT
 scan

On 2020/10/16 15:27, Hanjun Guo wrote:
>> The patch only takes the address limit field into account if its value 
>> > 0.
> 
> Sorry I missed the if (*->memory_address_limit) check, thanks
> for the reminding.
> 
>>
>> Also, before commit 7fb89e1d44cb6aec ("ACPI/IORT: take _DMA methods
>> into account for named components"), the _DMA method was not taken
>> into account for named components at all, and only the IORT limit was
>> used, so I do not anticipate any problems with that.
> 
> Then this patch is fine to me.

Certainly we need to address Lorenzo's comments.

Thanks
Hanjun