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

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Date: Wed, 31 Jan 2024 08:57:19 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Alexandru Elisei <alexandru.elisei@....com>
Cc: catalin.marinas@....com, will@...nel.org, oliver.upton@...ux.dev,
 maz@...nel.org, james.morse@....com, suzuki.poulose@....com,
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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 1/30/24 17:27, Alexandru Elisei wrote:
> Hi,
> 
> On Tue, Jan 30, 2024 at 10:04:02AM +0530, Anshuman Khandual wrote:
>>
>>
>> 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.
> 
> Ah, I see, makes sense. Since basically all the core mm changes are there
> to enable dynamic tag storage for arm64, I'll hold on until the series
> stabilises before separating the core mm from the arm64 patches.

Fair enough but at least could you please separate out this particular
patch right away and send across. 

mm: cma: Don't append newline when generating CMA area name