linux-kernel - Re: [PATCH RFC v3 04/35] mm: page_alloc: Partially revert "mm: page

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Date: Tue, 30 Jan 2024 10:04:02 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Alexandru Elisei <alexandru.elisei@....com>
Cc: catalin.marinas@....com, will@...nel.org, oliver.upton@...ux.dev,
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Subject: Re: [PATCH RFC v3 04/35] mm: page_alloc: Partially revert "mm:
 page_alloc: remove stale CMA guard code"



On 1/29/24 17:16, Alexandru Elisei wrote:
> Hi,
> 
> On Mon, Jan 29, 2024 at 02:31:23PM +0530, Anshuman Khandual wrote:
>>
>>
>> On 1/25/24 22:12, Alexandru Elisei wrote:
>>> The patch f945116e4e19 ("mm: page_alloc: remove stale CMA guard code")
>>> removed the CMA filter when allocating from the MIGRATE_MOVABLE pcp list
>>> because CMA is always allowed when __GFP_MOVABLE is set.
>>>
>>> With the introduction of the arch_alloc_cma() function, the above is not
>>> true anymore, so bring back the filter.
>>
>> This makes sense as arch_alloc_cma() now might prevent ALLOC_CMA being
>> assigned to alloc_flags in gfp_to_alloc_flags_cma().
> 
> Can I add your Reviewed-by tag then?

I think all these changes need to be reviewed in their entirety
even though some patches do look good on their own. For example
this patch depends on whether [PATCH 03/35] is acceptable or not.

I would suggest separating out CMA patches which could be debated
and merged regardless of this series.