linux-kernel - Re: [RFC Patch 08/19] ACPI: Add prefetch decoding to the address space parser

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Date:	Wed, 21 Jan 2015 01:35:13 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Len Brown <lenb@...nel.org>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [RFC Patch 08/19] ACPI: Add prefetch decoding to the address space parser

On Thursday, January 08, 2015 10:32:55 AM Jiang Liu wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> Add support of PREFETCH attributre to ACPI address space and extended
> address space parser.

This potentially enables untested configurations which tends to uncover bugs,
so I'm concerned.

What's the possible impact of this?

> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
>  drivers/acpi/resource.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index a56a64164410..abe3a29ad802 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -200,6 +200,9 @@ static bool acpi_decode_space(struct resource *res,
>  	if (base->producer_consumer == ACPI_PRODUCER)
>  		res->flags |= IORESOURCE_WINDOW;
>  
> +	if (base->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
> +		res->flags |= IORESOURCE_PREFETCH;
> +
>  	return !(res->flags & IORESOURCE_DISABLED);
>  }
>  
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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