linux-kernel - Re: [PATCH v5 4/5] arm64: mm: Only remove nomap flag for initrd

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Date:   Wed, 15 Jun 2022 11:04:02 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Wupeng Ma <mawupeng1@...wei.com>
Cc:     corbet@....net, will@...nel.org, ardb@...nel.org,
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Subject: Re: [PATCH v5 4/5] arm64: mm: Only remove nomap flag for initrd

On Tue, Jun 14, 2022 at 05:21:55PM +0800, Wupeng Ma wrote:
> From: Ma Wupeng <mawupeng1@...wei.com>
> 
> Commit 177e15f0c144 ("arm64: add the initrd region to the linear mapping explicitly")
> remove all the flags of the memory used by initrd. This is fine since
> MEMBLOCK_MIRROR is not used in arm64.
> 
> However with mirrored feature introduced to arm64, this will clear the mirrored
> flag used by initrd, which will lead to error log printed by
> find_zone_movable_pfns_for_nodes() if the lower 4G range has some non-mirrored
> memory.
> 
> To solve this problem, only MEMBLOCK_NOMAP flag will be removed via
> memblock_clear_nomap().
> 
> Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
> Reviewed-by: Ard Biesheuvel <ardb@...nel.org>

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