Commit 5f7ee246 authored Feb 08, 2016 by Ingo Molnar

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@linux-foundation.org>
Cc: Brad Spengler <spender@grsecurity.net>
Cc: Chen Tang <imtangchen@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: PaX Team <pageexec@freemail.hu>
Cc: Taku Izumi <izumi.taku@jp.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: y14sg1 <y14sg1@comcast.net>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent c1a0bf34

arch/x86/mm/numa.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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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