linux-kernel - Re: [PATCH] mm: Move HOLES_IN

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Date:   Mon, 19 Apr 2021 11:32:24 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: Move HOLES_IN_ZONE into mm

On Sat, Apr 17, 2021 at 03:59:46PM +0800, Kefeng Wang wrote:
> commit a55749639dc1 ("ia64: drop marked broken DISCONTIGMEM and VIRTUAL_MEM_MAP")
> drop VIRTUAL_MEM_MAP, so there is no need HOLES_IN_ZONE on ia64.
> 
> Also move HOLES_IN_ZONE into mm/Kconfig, select it if architecture needs
> this feature.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  arch/arm64/Kconfig | 4 +---
>  arch/ia64/Kconfig  | 3 ---
>  arch/mips/Kconfig  | 3 ---
>  mm/Kconfig         | 3 +++
>  4 files changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index f0b17d758912..3c5a53e0db91 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -202,6 +202,7 @@ config ARM64
>  	select HAVE_KPROBES
>  	select HAVE_KRETPROBES
>  	select HAVE_GENERIC_VDSO
> +	select HOLES_IN_ZONE
>  	select IOMMU_DMA if IOMMU_SUPPORT
>  	select IRQ_DOMAIN
>  	select IRQ_FORCED_THREADING
> @@ -1053,9 +1054,6 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK
>  	def_bool y
>  	depends on NUMA
>  
> -config HOLES_IN_ZONE
> -	def_bool y
> -
>  source "kernel/Kconfig.hz"

For arm64:

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