linux-kernel - [PATCH v2] NUMA x86: add constraints check for nid parameters

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Message-ID: <20111207194311.GB26060@dhcp-27-244.brq.redhat.com>
Date:	Wed, 7 Dec 2011 20:43:12 +0100
From:	Petr Holasek <pholasek@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Anton Arapov <anton@...hat.com>
Subject: [PATCH v2] NUMA x86: add constraints check for nid parameters

This patch adds constraints checks for numa_set_distance()
function. It emits warning when pxms are used uninitialized
when parsing the SRAT.

Signed-off-by: Petr Holasek <pholasek@...hat.com>
---
 arch/x86/mm/numa.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index fbeaaf4..42c12b6 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -430,8 +430,9 @@ static int __init numa_alloc_distance(void)
  * calls are ignored until the distance table is reset with
  * numa_reset_distance().
  *
- * If @from or @to is higher than the highest known node at the time of
- * table creation or @distance doesn't make sense, the call is ignored.
+ * If @from or @to is higher than the highest known node or lower than zero
+ * at the time of table creation or @distance doesn't make sense, the call
+ * is ignored.
  * This is to allow simplification of specific NUMA config implementations.
  */
 void __init numa_set_distance(int from, int to, int distance)
@@ -439,7 +440,8 @@ 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) {
+	if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
+			from < 0 || to < 0) {
 		printk_once(KERN_DEBUG "NUMA: Debug: distance out of bound, from=%d to=%d distance=%d\n",
 			    from, to, distance);
 		return;
-- 
1.7.6.4
--
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