linux-kernel - Re: [PATCH v5 04/22] x86, ACPI: Search buffer above 4G in second try for acpi override tables

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Message-ID: <1371511350.27152.25.camel@misato.fc.hp.com>
Date:	Mon, 17 Jun 2013 17:22:30 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Thomas Renninger <trenn@...e.de>,
	Tang Chen <tangchen@...fujitsu.com>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v5 04/22] x86, ACPI: Search buffer above 4G in second
 try for acpi override tables

On Fri, 2013-06-14 at 17:56 -0700, Yinghai Lu wrote:
> Now we only search buffer for override acpi table under 4G.
> In some case, like user use memmap to exclude all low ram,
> we may not find range for it under 4G.
> 
> Do second try to search above 4G.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...k.pl>
> Cc: linux-acpi@...r.kernel.org
> Tested-by: Thomas Renninger <trenn@...e.de>
> Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
> Tested-by: Tang Chen <tangchen@...fujitsu.com>
> ---
>  drivers/acpi/osl.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 93e3194..42c48fc 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -627,6 +627,10 @@ void __init acpi_initrd_override(void *data, size_t size)
>  	/* under 4G at first, then above 4G */
>  	acpi_tables_addr = memblock_find_in_range(0, (1ULL<<32) - 1,
>  					all_tables_size, PAGE_SIZE);
> +	if (!acpi_tables_addr)
> +		acpi_tables_addr = memblock_find_in_range(0,
> +					~(phys_addr_t)0,
> +					all_tables_size, PAGE_SIZE);

Should this search start from 4G, instead of 0?

Thanks,
-Toshi


>  	if (!acpi_tables_addr) {
>  		WARN_ON(1);
>  		return;


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