linux-kernel - Re: [PATCH 4/8] arm64: Add Kconfig/Makefile to build hardware prefetch control driver

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Date:   Sat, 29 Jan 2022 09:03:23 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Kohei Tarumizu <tarumizu.kohei@...itsu.com>,
        catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] arm64: Add Kconfig/Makefile to build hardware
 prefetch control driver

Hi--

On 1/24/22 23:14, Kohei Tarumizu wrote:
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 6978140edfa4..c2256dbb0243 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig

>  	def_bool y
>  	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_SYSREG
>  
> +config ARM64_HWPF_CONTROL
> +	tristate "ARM64 Hardware Prefetch Control support"
> +	depends on HWPF_CONTROL
> +	default m

Don't enable random drivers unless they are required for booting etc.
So can you justify having this driver enabled by default?

I see that the X86 driver is not enabled by default.

> +	help
> +	  This adds Hardware Prefetch Control driver support for ARM64.

thanks.
-- 
~Randy