linux-kernel - [PATCH 3.16.y-ckt 167/185] of: return NUMA_NO_NODE from fallback of_node_to

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Message-Id: <1436951580-15977-168-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 15 Jul 2015 10:12:42 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	Grant Likely <grant.likely@...aro.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 167/185] of: return NUMA_NO_NODE from fallback of_node_to_nid()

3.16.7-ckt15 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>

commit c8fff7bc5bba6bd59cad40441c189c4efe7190f6 upstream.

Node 0 might be offline as well as any other numa node,
in this case kernel cannot handle memory allocation and crashes.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Fixes: 0c3f061c195c ("of: implement of_node_to_nid as a weak function")
Signed-off-by: Grant Likely <grant.likely@...aro.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/of/base.c  | 2 +-
 include/linux/of.h | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 296bc43d26cc..9985665f7397 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -85,7 +85,7 @@ EXPORT_SYMBOL(of_n_size_cells);
 #ifdef CONFIG_NUMA
 int __weak of_node_to_nid(struct device_node *np)
 {
-	return numa_node_id();
+	return NUMA_NO_NODE;
 }
 #endif
 
diff --git a/include/linux/of.h b/include/linux/of.h
index db2f8ac18dad..55452d38ae06 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -580,7 +580,10 @@ static inline const char *of_prop_next_string(struct property *prop,
 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
 extern int of_node_to_nid(struct device_node *np);
 #else
-static inline int of_node_to_nid(struct device_node *device) { return 0; }
+static inline int of_node_to_nid(struct device_node *device)
+{
+	return NUMA_NO_NODE;
+}
 #endif
 
 static inline struct device_node *of_find_matching_node(
--
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