[tip:x86/urgent] x86: check boundary in setup_node_bootmem()

[tip-bot for Yinghai Lu]

Commit-ID:  4c31e92b97b6d7e7b19ee5e54a22571ffdebb305
Gitweb:     http://git.kernel.org/tip/4c31e92b97b6d7e7b19ee5e54a22571ffdebb305
Author:     Yinghai Lu <yinghai@xxxxxxxxxx>
AuthorDate: Wed, 22 Apr 2009 14:19:27 -0700
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 23 Apr 2009 09:58:56 +0200

x86: check boundary in setup_node_bootmem()

Commit dc09855 ("x86/uv: fix init of memory-less nodes") causes a
two sockets system (where node-1 doesn't have RAM installed) to crash.

That commit makes node_possible include cpu nodes that do not have memory.
So check boundary in setup_node_bootmem().

[ Impact: fix boot crash on RAM-less NUMA node system ]

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Jack Steiner <steiner@xxxxxxx>
LKML-Reference: <49EF89DF.9090404@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 arch/x86/mm/numa_64.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index d73aaa8..2d05a12 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -188,6 +188,9 @@ void __init setup_node_bootmem(int nodeid, unsigned long start,
 	const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
 	int nid;
 
+	if (!end)
+		return;
+
 	start = roundup(start, ZONE_ALIGN);
 
 	printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid,
--
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