linux-kernel - RE: [PATCH] arm64: mm: make CONFIG_ZONE

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Date:   Mon, 23 Mar 2020 01:30:53 +0000
From:   Peng Fan <peng.fan@....com>
To:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "nsaenzjulienne@...e.de" <nsaenzjulienne@...e.de>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] arm64: mm: make CONFIG_ZONE_DMA configurable without
 EXPERT

> Subject: [PATCH] arm64: mm: make CONFIG_ZONE_DMA configurable
> without EXPERT

Gentle ping..

Thanks,
Peng.

> 
> From: Peng Fan <peng.fan@....com>
> 
> commit 1a8e1cef7603 ("arm64: use both ZONE_DMA and ZONE_DMA32")
> enables both ZONE_DMA and ZONE_DMA32. The lower 1GB memory will be
> occupied by ZONE_DMA, this will cause CMA allocation fail on some platforms,
> because CMA area could not across different type of memory zones.
> 
> Make CONFIG_ZONE_DMA configurable without EXPERT option could let
> people build non debug kernel image with CONFIG_ZONE_DMA disabled.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  arch/arm64/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index
> 217e12ff2115..c4ba8bf011e1 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -270,7 +270,7 @@ config GENERIC_CALIBRATE_DELAY
>  	def_bool y
> 
>  config ZONE_DMA
> -	bool "Support DMA zone" if EXPERT
> +	bool "Support DMA zone"
>  	default y
> 
>  config ZONE_DMA32
> --
> 2.16.4