linux-kernel - Re: [PATCH stable v5.10 0/7] arm64: Default to 32-bit wide ZONE

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Message-ID: <29d5f027-c7d7-c7da-683b-cab12cc093f0@huawei.com>
Date:   Sat, 26 Jun 2021 09:19:02 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Jing Xiangfeng <jingxiangfeng@...wei.com>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <akpm@...ux-foundation.org>, <guohanjun@...wei.com>,
        <sudeep.holla@....com>, <song.bao.hua@...ilicon.com>,
        <ardb@...nel.org>, <anshuman.khandual@....com>,
        <stable@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Li Huafei <lihuafei1@...wei.com>
Subject: Re: [PATCH stable v5.10 0/7] arm64: Default to 32-bit wide ZONE_DMA


On 2021/6/25 18:19, Greg KH wrote:
> On Wed, Jun 23, 2021 at 04:01:10PM +0800, Kefeng Wang wrote:
>>
>> Let's inline the link:
>> https://lore.kernel.org/lkml/20210303073319.2215839-1-jingxiangfeng@huawei.com/
>>
>> The following 7 patches(we asked from link) has merged into lts5.10(tag:
>> v5.10.22)
>>
>>    4d7ed9a49b0c mm: Remove examples from enum zone_type comment
>>    8eaef922e938 arm64: mm: Set ZONE_DMA size based on early IORT scan
>>    35ec3d09ff6a arm64: mm: Set ZONE_DMA size based on devicetree's dma-ranges
>>    a9861e7fa4f8 of: unittest: Add test for of_dma_get_max_cpu_address()
>>    18bf6e998d08 of/address: Introduce of_dma_get_max_cpu_address()
>>    3fbe62ffbb54 arm64: mm: Move zone_dma_bits initialization into
>> zone_sizes_init()
>>    407b173adfac arm64: mm: Move reserve_crashkernel() into mem_init()
>>
>> but the patch "arm64: mm: Move reserve_crashkernel() into mem_init()"
>> has some issue, see the following discussion from Catalin,
>>
>> https://lore.kernel.org/linux-devicetree/e60d643e-4879-3fc3-737d-2c145332a6d7@arm.com/
>> https://lore.kernel.org/linux-arm-kernel/20201119175556.18681-1-catalin.marinas@arm.com/
>>
>> and yes, we met crash in lts5.10 when kexec boot due to "arm64: mm: Move
>> reserve_crashkernel() into mem_init()" too, which could be fixed by
>> commit 2687275a5843 "arm64: Force NO_BLOCK_MAPPINGS if crashkernel
>> reservation is required", and the commit 791ab8b2e3db "arm64: Ignore any DMA
>> offsets in the max_zone_phys() calculation" also about DMA set,
>> So I only asked the two patches(both in v5.11) related ARM64 ZONE_DMA
>> changes backported into lts5.10.
> Thanks, all now queued up.
Thank you again ;)
> greg k-h
> .
>