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

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Date:	Mon, 17 Jun 2013 17:56:30 -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 Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	ACPI Devel Maling List <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 Mon, 2013-06-17 at 16:38 -0700, Yinghai Lu wrote:
> On Mon, Jun 17, 2013 at 4:22 PM, Toshi Kani <toshi.kani@...com> wrote:
> > 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?
> 
> should be ok, as memblock searching is top-down.

I see.  Thanks for the clarification.

Acked-by: Toshi Kani <toshi.kani@...com>

-Toshi

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