linux-kernel - Re: [PATCH] arm64/Kconfig: introduce GENERIC_ISA

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Message-ID: <20241028150544.GA2445@willie-the-truck>
Date: Mon, 28 Oct 2024 15:05:45 +0000
From: Will Deacon <will@...nel.org>
To: huanglei814 <huanglei814@....com>
Cc: catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, huanglei <huanglei@...inos.cn>
Subject: Re: [PATCH] arm64/Kconfig: introduce GENERIC_ISA_DMA

On Fri, Oct 25, 2024 at 09:16:41AM +0800, huanglei814 wrote:
> From: huanglei <huanglei@...inos.cn>
> 
> Enable GENERIC_ISA_DMA feature on arm64 platform,
> thus, request_dma and free_dma interface can be export.
> and driver modules can use the this interfaces on arm64
> platform.
> 
> Currently, many pcie parallel port drivers still use these
> interfaces when ported to arm64 platform.

Why has it taken so long for anybody to notice?

> Signed-off-by: huanglei <huanglei@...inos.cn>
> ---
>  arch/arm64/Kconfig | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index fd9df6dcc593..986eb251f68f 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -367,6 +367,9 @@ config GENERIC_CSUM
>  config GENERIC_CALIBRATE_DELAY
>  	def_bool y
>  
> +config GENERIC_ISA_DMA
> +	def_bool y
> +

Does this actually do anything without MAX_DMA_CHANNELS defined?

Will