linux-kernel - Re: [PATCH V3 (RESEND) 3/3] arm64/mm: Enable vmem

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Date:   Thu, 2 Jul 2020 15:09:07 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm@...ck.org, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Steve Capper <steve.capper@....com>,
        David Hildenbrand <david@...hat.com>,
        Yu Zhao <yuzhao@...gle.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 (RESEND) 3/3] arm64/mm: Enable vmem_altmap support for
 vmemmap mappings

On Thu, Jun 18, 2020 at 06:45:30AM +0530, Anshuman Khandual wrote:
> Device memory ranges when getting hot added into ZONE_DEVICE, might require
> their vmemmap mapping's backing memory to be allocated from their own range
> instead of consuming system memory. This prevents large system memory usage
> for potentially large device memory ranges. Device driver communicates this
> request via vmem_altmap structure. Architecture needs to take this request
> into account while creating and tearing down vemmmap mappings.
> 
> This enables vmem_altmap support in vmemmap_populate() and vmemmap_free()
> which includes vmemmap_populate_basepages() used for ARM64_16K_PAGES and
> ARM64_64K_PAGES configs.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Steve Capper <steve.capper@....com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Yu Zhao <yuzhao@...gle.com>
> Cc: Hsin-Yi Wang <hsinyi@...omium.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Tested-by: Jia He <justin.he@....com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

This looks fine to me:

Reviewed-by: Catalin Marinas <catalin.marinas@....com>

I presume this series would go into mainline via the mm tree as it
touches several architectures.