linux-kernel - Re: [PATCH v2 4/5] mm,memory_hotplug: allocate memmap from the added memory range for sparse-vmemmap

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Date:   Wed, 26 Jun 2019 13:47:32 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Oscar Salvador <osalvador@...e.de>, akpm@...ux-foundation.org
Cc:     mhocko@...e.com, dan.j.williams@...el.com,
        pasha.tatashin@...een.com, Jonathan.Cameron@...wei.com,
        david@...hat.com, vbabka@...e.cz, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] mm,memory_hotplug: allocate memmap from the added
 memory range for sparse-vmemmap

Hello Oscar,

On 06/25/2019 01:22 PM, Oscar Salvador wrote:
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index 93ed0df4df79..d4b5661fa6b6 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -765,7 +765,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
>  		if (pmd_none(READ_ONCE(*pmdp))) {
>  			void *p = NULL;
>  
> -			p = vmemmap_alloc_block_buf(PMD_SIZE, node);
> +			if (altmap)
> +				p = altmap_alloc_block_buf(PMD_SIZE, altmap);
> +			else
> +				p = vmemmap_alloc_block_buf(PMD_SIZE, node);
>  			if (!p)
>  				return -ENOMEM;

Is this really required to be part of this series ? I have an ongoing work
(reworked https://patchwork.kernel.org/patch/10882781/) enabling altmap
support on arm64 during memory hot add and remove path which is waiting on
arm64 memory-hot remove to be merged first.

- Anshuman