linux-kernel - Re: [RFC PATCH 1/4] ACPI/Resource: Add memory prefetch check support

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Message-ID: <30641406.PKxpUfsNWU@vostro.rjw.lan>
Date:	Sat, 07 Sep 2013 02:11:58 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Lan Tianyu <tianyu.lan@...el.com>
Cc:	lenb@...nel.org, yinghai@...nel.org, bhelgaas@...gle.com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/4] ACPI/Resource: Add memory prefetch check support

On Friday, September 06, 2013 10:24:43 AM Lan Tianyu wrote:
> This patch is to check mem address space's acpi resource caching ability
> and set prefetch flag of struct resource if it's prefetchable.
> 
> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>

Looks good to me.

Thanks,
Rafael


> ---
>  drivers/acpi/resource.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index b7201fc..929f416 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -202,6 +202,9 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
>  		res->flags = acpi_dev_memresource_flags(len,
>  						addr.info.mem.write_protect,
>  						window);
> +
> +		if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
> +			res->flags |= IORESOURCE_PREFETCH;
>  		break;
>  	case ACPI_IO_RANGE:
>  		io_decode = addr.granularity == 0xfff ?
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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