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

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Date:	Mon, 14 Feb 2011 17:18:57 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Yinghai Lu <yinghai@...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 08:14:36AM -0800, Yinghai Lu wrote:
> 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.

How does it return 0?

...
		cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
					    acpi_parse_memory_affinity,
					    NR_NODE_MEMBLKS);
If there's no srat, cnt is zero.
	}

	/* SLIT: System Locality Information Table */
	acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);

	acpi_numa_arch_fixup();

	if (cnt <= 0)
if cnt is zero, the if is taken
		return cnt ?: -ENOENT;
and as cnt is zero, -ENOENT is returned.
	return 0;
The function returns 0 iff cnt > 0.

-- 
tejun
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