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Commit 2bf50555 authored by Yinghai Lu's avatar Yinghai Lu Committed by Tejun Heo
Browse files

x86-64, NUMA: Seperate out numa_alloc_distance() from numa_set_distance() 



Alloc code is much bigger the distance setting.  Separate it out into
numa_alloc_distance() for readability.

-v2: Let alloc_numa_distance to return -ENOMEM on failing path,
     requested by tj.

-tj: Description update.  Minor tweaks including function name,
     location and return value check.

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 90e6b677

arch/x86/mm/numa_64.c

+40 −35
Original line number Diff line number Diff line
@@ -401,19 +401,8 @@ void __init numa_reset_distance(void) 
	numa_distance = NULL;

}



/**

 * numa_set_distance - Set NUMA distance from one NUMA to another

 * @from: the 'from' node to set distance

 * @to: the 'to'  node to set distance

 * @distance: NUMA distance

 *

 * Set the distance from node @from to @to to @distance.  If distance table

 * doesn't exist, one which is large enough to accomodate all the currently

 * known nodes will be created.

 */

void __init numa_set_distance(int from, int to, int distance)

static int __init numa_alloc_distance(void)

{

	if (!numa_distance) {

	nodemask_t nodes_parsed;

	size_t size;

	int i, j, cnt = 0;
@@ -427,14 +416,13 @@ void __init numa_set_distance(int from, int to, int distance) 
		cnt = i;

	size = ++cnt * sizeof(numa_distance[0]);



		phys = memblock_find_in_range(0,

					      (u64)max_pfn_mapped << PAGE_SHIFT,

	phys = memblock_find_in_range(0, (u64)max_pfn_mapped << PAGE_SHIFT,

				      size, PAGE_SIZE);

	if (phys == MEMBLOCK_ERROR) {

		pr_warning("NUMA: Warning: can't allocate distance table!\n");

		/* don't retry until explicitly reset */

		numa_distance = (void *)1LU;

			return;

		return -ENOMEM;

	}

	memblock_x86_reserve_range(phys, phys + size, "NUMA DIST");
@@ -447,8 +435,25 @@ void __init numa_set_distance(int from, int to, int distance) 
			numa_distance[i * cnt + j] = i == j ?

				LOCAL_DISTANCE : REMOTE_DISTANCE;

	printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);



	return 0;

}



/**

 * numa_set_distance - Set NUMA distance from one NUMA to another

 * @from: the 'from' node to set distance

 * @to: the 'to'  node to set distance

 * @distance: NUMA distance

 *

 * Set the distance from node @from to @to to @distance.  If distance table

 * doesn't exist, one which is large enough to accomodate all the currently

 * known nodes will be created.

 */

void __init numa_set_distance(int from, int to, int distance)

{

	if (!numa_distance && numa_alloc_distance() < 0)

		return;



	if (from >= numa_distance_cnt || to >= numa_distance_cnt) {

		printk_once(KERN_DEBUG "NUMA: Debug: distance out of bound, from=%d to=%d distance=%d\n",

			    from, to, distance);