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SubjectRe: [PATCH v2] mm: include CMA pages in lowmem_reserve at boot
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On 8/19/20 10:22 AM, Andrew Morton wrote:
> On Wed, 19 Aug 2020 10:15:53 -0700 Florian Fainelli <f.fainelli@gmail.com> wrote:
>
>>>> In many cases the difference is not significant, but for example
>>>> an ARM platform with 1GB of memory and the following memory layout
>>>> [ 0.000000] cma: Reserved 256 MiB at 0x0000000030000000
>>>> [ 0.000000] Zone ranges:
>>>> [ 0.000000] DMA [mem 0x0000000000000000-0x000000002fffffff]
>>>> [ 0.000000] Normal empty
>>>> [ 0.000000] HighMem [mem 0x0000000030000000-0x000000003fffffff]
>>>>
>>>> would result in 0 lowmem_reserve for the DMA zone. This would allow
>>>> userspace to deplete the DMA zone easily.
>>>
>>> Sounds fairly serious for thos machines. Was a cc:stable considered?
>>
>> Since there is a Fixes: tag, it may have been assumed that the patch
>> would be picked up and as soon as it reaches Linus' tree it would be
>> picked up by the stable selection.
>
> It doesn't work that way - sometimes a fix isn't considered important
> enough to backport. It could just fix a typo in a comment!

Then can this be applied ASAP and back ported?
--
Florian

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