linux-kernel - Re: [PATCH v4 7/8] x86: Add Kconfig/Makefile to build hardware prefetch control driver

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Date:   Wed, 18 May 2022 08:43:48 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Kohei Tarumizu <tarumizu.kohei@...itsu.com>
Cc:     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, rafael@...nel.org,
        mchehab+huawei@...nel.org, eugenis@...gle.com, tony.luck@...el.com,
        pcc@...gle.com, peterz@...radead.org, marcos@...a.pet,
        conor.dooley@...rochip.com, nicolas.ferre@...rochip.com,
        marcan@...can.st, linus.walleij@...aro.org, arnd@...db.de,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 7/8] x86: Add Kconfig/Makefile to build hardware
 prefetch control driver

On Wed, May 18, 2022 at 03:30:31PM +0900, Kohei Tarumizu wrote:
> This adds Kconfig/Makefile to build hardware prefetch control driver
> for x86 support. This also adds a MAINTAINERS entry.
> 
> Signed-off-by: Kohei Tarumizu <tarumizu.kohei@...itsu.com>
> ---
>  MAINTAINERS                  | 1 +
>  arch/x86/Kconfig             | 6 ++++++
>  arch/x86/kernel/cpu/Makefile | 2 ++
>  3 files changed, 9 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index dd1345087881..9759c3606c7d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8623,6 +8623,7 @@ K:	(devm_)?hwmon_device_(un)?register(|_with_groups|_with_info)
>  HARDWARE PREFETCH CONTROL DRIVERS
>  M:	Kohei Tarumizu <tarumizu.kohei@...itsu.com>
>  S:	Maintained
> +F:	arch/x86/kernel/cpu/x86-pfctl.c
>  F:	drivers/base/pfctl.c
>  F:	drivers/soc/fujitsu/a64fx-pfctl.c
>  F:	include/linux/pfctl.h
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 4bed3abf444d..81df9efc69e5 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1359,6 +1359,12 @@ config X86_CPUID
>  	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
>  	  /dev/cpu/31/cpuid.
>  
> +config X86_HWPF_CONTROL
> +	tristate "x86 Hardware Prefetch Control support"
> +	depends on X86_64 && HWPF_CONTROL
> +	help
> +	  This adds Hardware Prefetch driver control support for X86.
> +

You need a lot more text here about what this is, what it does, why you
would want it, and the module name it will create.

thanks,

greg k-h