linux-kernel - [PATCH] net: Avoid allocing memory on memoryless numa node

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Date:   Sun, 11 Oct 2020 12:11:40 +0800
From:   Xianting Tian <tian.xianting@....com>
To:     <davem@...emloft.net>, <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Xianting Tian <tian.xianting@....com>
Subject: [PATCH] net: Avoid allocing memory on memoryless numa node

In architecture like powerpc, we can have cpus without any local memory
attached to it. In such cases the node does not have real memory.

Use local_memory_node(), which is guaranteed to have memory.
local_memory_node is a noop in other architectures that does not support
memoryless nodes.

Signed-off-by: Xianting Tian <tian.xianting@....com>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 266073e30..dcb4533ef 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2590,7 +2590,7 @@ static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index,
 		new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL);
 	else
 		new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
-				       cpu_to_node(attr_index));
+				       local_memory_node(cpu_to_node(attr_index)));
 	if (!new_map)
 		return NULL;
 
-- 
2.17.1