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Date: Fri, 18 Feb 2011 10:59:38 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
David Rientjes <rientjes@...gle.com>,
Cyrill Gorcunov <gorcunov@...il.com>
Subject: [PATCH 4/4] x86, numa: seperate alloc_numa_distance from numa_reset_distance.
alloc code is much bigger the setting self.
make the code some readable.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/mm/numa_64.c | 77 +++++++++++++++++++++++++++-----------------------
1 file changed, 42 insertions(+), 35 deletions(-)
Index: linux-2.6/arch/x86/mm/numa_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/numa_64.c
+++ linux-2.6/arch/x86/mm/numa_64.c
@@ -375,6 +375,43 @@ static void __init numa_reset_distance(v
numa_distance = NULL;
}
+static void __init alloc_numa_distance(void)
+{
+ nodemask_t nodes_parsed;
+ size_t size;
+ int i, j, cnt = 0;
+ u64 phys;
+
+ /* size the new table and allocate it */
+ nodes_parsed = numa_nodes_parsed;
+ numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
+
+ for_each_node_mask(i, nodes_parsed)
+ cnt = i;
+ size = ++cnt * sizeof(numa_distance[0]);
+
+ 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;
+ }
+ memblock_x86_reserve_range(phys, phys + size, "NUMA DIST");
+
+ numa_distance = __va(phys);
+ numa_distance_cnt = cnt;
+
+ /* fill with the default distances */
+ for (i = 0; i < cnt; i++)
+ for (j = 0; j < cnt; j++)
+ numa_distance[i * cnt + j] = i == j ?
+ LOCAL_DISTANCE : REMOTE_DISTANCE;
+ printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
+}
+
/*
* Set the distance between node @from to @to to @distance. If distance
* table doesn't exist, one which is large enough to accomodate all the
@@ -382,41 +419,11 @@ static void __init numa_reset_distance(v
*/
void __init numa_set_distance(int from, int to, int distance)
{
- if (!numa_distance) {
- nodemask_t nodes_parsed;
- size_t size;
- int i, j, cnt = 0;
- u64 phys;
-
- /* size the new table and allocate it */
- nodes_parsed = numa_nodes_parsed;
- numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
-
- for_each_node_mask(i, nodes_parsed)
- cnt = i;
- size = ++cnt * sizeof(numa_distance[0]);
-
- 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;
- }
- memblock_x86_reserve_range(phys, phys + size, "NUMA DIST");
-
- numa_distance = __va(phys);
- numa_distance_cnt = cnt;
-
- /* fill with the default distances */
- for (i = 0; i < cnt; i++)
- for (j = 0; j < cnt; j++)
- numa_distance[i * cnt + j] = i == j ?
- LOCAL_DISTANCE : REMOTE_DISTANCE;
- printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
- }
+ if (!numa_distance)
+ alloc_numa_distance();
+
+ if (!numa_distance_cnt)
+ 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",
--
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