linux-kernel - Re: [PATCH 04/26] x86-64, NUMA: Unify {acpi|amd}_{numa_init|scan

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Date:	Mon, 14 Feb 2011 08:14:36 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, brgerst@...il.com,
	gorcunov@...il.com, shaohui.zheng@...el.com, rientjes@...gle.com,
	mingo@...e.hu, hpa@...ux.intel.com
Subject: Re: [PATCH 04/26] x86-64, NUMA: Unify {acpi|amd}_{numa_init|scan_nodes}()
 arguments and return values

On Mon, Feb 14, 2011 at 3:29 AM, Tejun Heo <tj@...nel.org> wrote:
> On Sat, Feb 12, 2011 at 10:39:03AM -0800, Yinghai Lu wrote:
>> > @@ -297,7 +297,10 @@ int __init acpi_numa_init(void)
>> >     acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
>> >
>> >     acpi_numa_arch_fixup();
>> > -   return ret;
>> > +
>> > +   if (cnt <= 0)
>> > +           return cnt ?: -ENOENT;
>> > +   return 0;
>> >  }
>> >
>> >  int acpi_get_pxm(acpi_handle h)
>>
>>
>> it will break AMD system that does not have SRAT.
>>
>> your change will treat NO_SRAT as SRAT is there.
>
> Can you please elaborate a bit?  Yinghai, there's brevity and there's
> being cryptic.  I appreciate your reviews but don't want to spend time
> trying to decipher what you mean.  If it doesn't hurt your fingers too
> much, please put a bit more effort into explaining.

when system have acpi support  but SRAT is NOT there,  new
acpi_numa_init() will return 0 just like SRAT is there and correct.
So it will skip AMD node scanning.

Yinghai
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