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Date:   Wed, 23 Jun 2021 09:34:36 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Kefeng Wang <wangkefeng.wang@huawei.com>
Cc:     Jing Xiangfeng <jingxiangfeng@huawei.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        catalin.marinas@arm.com, will@kernel.org,
        akpm@linux-foundation.org, guohanjun@huawei.com,
        sudeep.holla@arm.com, song.bao.hua@hisilicon.com, ardb@kernel.org,
        anshuman.khandual@arm.com, stable@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Li Huafei <lihuafei1@huawei.com>
Subject: Re: [PATCH stable v5.10 0/7] arm64: Default to 32-bit wide ZONE_DMA
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On Wed, Jun 23, 2021 at 03:25:10PM +0800, Kefeng Wang wrote:
> 
> 
> 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]

The subject doesn't help much, sorry, what commit does this refer to?
What happened to it?  Was it accepted or rejected?

> > > especially the
> > > second one, both them need be backported, thanks.
> > 
> > Backported to where?
> 
> stable 5.10

Why?

> > > 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.

These [] do not seem to be links :(

thanks,

greg k-h