linux-kernel - [PATCH 4/4] x86, numa: seperate alloc_numa_distance from numa_reset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <4D5EC19A.9030808@kernel.org>
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",
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/