On Wed, Jun 23, 2021 at 03:25:10PM +0800, Kefeng Wang wrote:

On 2021/6/23 15:12, Greg KH wrote:

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On Wed, Jun 23, 2021 at 02:59:59PM +0800, Kefeng Wang wrote:

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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?

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especially the
second one, both them need be backported, thanks.

Backported to where?

stable 5.10

Why?

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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