linux-kernel - Re: [PATCH v4 2/8] drivers: base: Add Kconfig/Makefile to build hardware prefetch control core driver

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Date:   Wed, 18 May 2022 09:04:44 +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 2/8] drivers: base: Add Kconfig/Makefile to build
 hardware prefetch control core driver

On Wed, May 18, 2022 at 03:30:26PM +0900, Kohei Tarumizu wrote:
> Adds Kconfig/Makefile to build hardware prefetch control core driver,
> and also adds a MAINTAINERS entry.
> 
> Signed-off-by: Kohei Tarumizu <tarumizu.kohei@...itsu.com>
> ---
>  MAINTAINERS           | 6 ++++++
>  drivers/base/Kconfig  | 9 +++++++++
>  drivers/base/Makefile | 1 +
>  3 files changed, 16 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d6d879cb0afd..f188403bc2e9 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8620,6 +8620,12 @@ F:	include/linux/hwmon*.h
>  F:	include/trace/events/hwmon*.h
>  K:	(devm_)?hwmon_device_(un)?register(|_with_groups|_with_info)
>  
> +HARDWARE PREFETCH CONTROL DRIVERS
> +M:	Kohei Tarumizu <tarumizu.kohei@...itsu.com>
> +S:	Maintained
> +F:	drivers/base/pfctl.c
> +F:	include/linux/pfctl.h
> +
>  HARDWARE RANDOM NUMBER GENERATOR CORE
>  M:	Matt Mackall <mpm@...enic.com>
>  M:	Herbert Xu <herbert@...dor.apana.org.au>
> diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
> index 6f04b831a5c0..8f8a69e7f645 100644
> --- a/drivers/base/Kconfig
> +++ b/drivers/base/Kconfig
> @@ -230,4 +230,13 @@ config GENERIC_ARCH_NUMA
>  	  Enable support for generic NUMA implementation. Currently, RISC-V
>  	  and ARM64 use it.
>  
> +config HWPF_CONTROL

Shouldn't this have "GENERIC" in the name liks the other generic
implementations in this directory?


> +	bool "Hardware Prefetch Control driver"
> +	help
> +	  This driver allows user to control CPU's Hardware Prefetch behavior.
> +	  If the machine supports this behavior, it provides a sysfs interface.

But this is not a driver, it's a core function that a driver uses.  On
its own, this code does nothing.

thanks,

greg k-h