Re: [PATCH RESEND part2 v2 6/8] acpi, numa, mem_hotplug: Mark all nodes the kernel resides un-hotpluggable

[Andrew Morton <akpm@linux-foundation.org>]

On Tue, 03 Dec 2013 10:28:13 +0800 Zhang Yanfei <zhangyanfei@cn.fujitsu.com> wrote:

> From: Tang Chen <tangchen@cn.fujitsu.com>
> 
> At very early time, the kernel have to use some memory such as
> loading the kernel image. We cannot prevent this anyway. So any
> node the kernel resides in should be un-hotpluggable.
> 
> @@ -555,6 +563,30 @@ static void __init numa_init_array(void)
>  	}
>  }
>  
> +static void __init numa_clear_kernel_node_hotplug(void)
> +{
> +	int i, nid;
> +	nodemask_t numa_kernel_nodes;
> +	unsigned long start, end;
> +	struct memblock_type *type = &memblock.reserved;
> +
> +	/* Mark all kernel nodes. */
> +	for (i = 0; i < type->cnt; i++)
> +		node_set(type->regions[i].nid, numa_kernel_nodes);
> +
> +	/* Clear MEMBLOCK_HOTPLUG flag for memory in kernel nodes. */
> +	for (i = 0; i < numa_meminfo.nr_blks; i++) {
> +		nid = numa_meminfo.blk[i].nid;
> +		if (!node_isset(nid, numa_kernel_nodes))
> +			continue;
> +
> +		start = numa_meminfo.blk[i].start;
> +		end = numa_meminfo.blk[i].end;
> +
> +		memblock_clear_hotplug(start, end - start);
> +	}
> +}

Shouldn't numa_kernel_nodes be initialized?


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