Commit-ID: 5f7ee246850ba18a6a7bcb3d5eddb6db68354688
Gitweb: http://git.kernel.org/tip/5f7ee246850ba18a6a7bcb3d5eddb6db68354688
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Mon, 8 Feb 2016 12:14:55 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 8 Feb 2016 12:14:55 +0100
x86/mm/numa: Check for failures in numa_clear_kernel_node_hotplug()
numa_clear_kernel_node_hotplug() uses memblock_set_node() without
checking for failures.
memblock_set_node() is a complex function that might extend the
memblock array - which extension might fail - so check for this
possibility.
It's not supposed to happen (because realistically if we have so
little memory that this fails then we likely won't be able to
boot anyway), but do the check nevertheless.
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Brad Spengler <spender@xxxxxxxxxxxxxx>
Cc: Chen Tang <imtangchen@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: PaX Team <pageexec@xxxxxxxxxxx>
Cc: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
Cc: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Wen Congyang <wency@xxxxxxxxxxxxxx>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Cc: y14sg1 <y14sg1@xxxxxxxxxxx>
Cc: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/mm/numa.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index ede4506..f70c1ff 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -491,8 +491,10 @@ static void __init numa_clear_kernel_node_hotplug(void)
*/
for (i = 0; i < numa_meminfo.nr_blks; i++) {
struct numa_memblk *mb = numa_meminfo.blk + i;
+ int ret;
- memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
+ ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
+ WARN_ON_ONCE(ret);
}
/*
--
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