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Subject: Re: [PATCH stable v5.10 0/7] arm64: Default to 32-bit wide ZONE_DMA
To:     Greg KH <gregkh@linuxfoundation.org>
CC:     Jing Xiangfeng <jingxiangfeng@huawei.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
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        Li Huafei <lihuafei1@huawei.com>
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From:   Kefeng Wang <wangkefeng.wang@huawei.com>
Message-ID: <e47df0fd-0ddd-408b-2972-1b6d0a786f00@huawei.com>
Date:   Wed, 23 Jun 2021 15:25:10 +0800
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On 2021/6/23 15:12, Greg KH wrote:
> On Wed, Jun 23, 2021 at 02:59:59PM +0800, Kefeng Wang wrote:
>> Hi Greg,
>>
>> There are two more patches about the ZONE_DMA[32] changes,
> 
> What ZONE_DMA changes?

See the subject, [PATCH stable v5.10 0/7] arm64: Default to 32-bit wide 
ZONE_DMA, We asked the ARM64 ZONE_DMA change backport before, link[1]
> 
>> especially the
>> second one, both them need be backported, thanks.
> 
> Backported to where?

stable 5.10

> 
>> 791ab8b2e3db - arm64: Ignore any DMA offsets in the max_zone_phys()
>> calculation
>> 2687275a5843 - arm64: Force NO_BLOCK_MAPPINGS if crashkernel reservation is
>> required
> 
> Have you tried these patches?  Where do they need to be applied to?

Yes, we tested it, without them, especially the second one, we will
meet crash when using kexec boot, also there is discussion in [2]
and [3] from Catalin.


> 
> confused,
> 
Sorry about this, should add more information, thanks.

[1] 
https://lore.kernel.org/linux-riscv/20210303073319.2215839-1-jingxiangfeng@huawei.com/
[2] 
https://lore.kernel.org/linux-devicetree/e60d643e-4879-3fc3-737d-2c145332a6d7@arm.com/
[3] 
https://lore.kernel.org/linux-arm-kernel/20201119175556.18681-1-catalin.marinas@arm.com/
> greg k-h
> .
>