From: Xishi Qiu <qiuxishi@huawei.com>
To: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tang Chen <tangchen@cn.fujitsu.com>,
Yinghai Lu <yinghai@kernel.org>
Cc: Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Toshi Kani <toshi.kani@hp.com>, Mel Gorman <mgorman@suse.de>,
Tejun Heo <tj@kernel.org>
Subject: node-hotplug: is memset 0 safe in try_offline_node()?
Date: Tue, 3 Mar 2015 11:30:23 +0800 [thread overview]
Message-ID: <54F52ACF.4030103@huawei.com> (raw)
When hot-remove a numa node, we will clear pgdat,
but is memset 0 safe in try_offline_node()?
process A: offline node XX:
for_each_populated_zone()
find online node XX
cond_resched()
offline cpu and memory, then try_offline_node()
node_set_offline(nid), and memset(pgdat, 0, sizeof(*pgdat))
access node XX's pgdat
NULL pointer access error
Thanks,
Xishi Qiu
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next reply other threads:[~2015-03-03 3:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-03 3:30 Xishi Qiu [this message]
2015-03-03 10:20 ` node-hotplug: is memset 0 safe in try_offline_node()? Gu Zheng
2015-03-04 2:22 ` Xishi Qiu
2015-03-04 2:52 ` Xishi Qiu
2015-03-04 3:56 ` Gu Zheng
2015-03-04 8:03 ` Xishi Qiu
2015-03-04 8:53 ` Kamezawa Hiroyuki
2015-03-04 9:53 ` Gu Zheng
2015-03-04 3:53 ` Gu Zheng
2015-03-04 7:01 ` Xishi Qiu
2015-03-04 8:31 ` Xie XiuQi
2015-03-05 8:26 ` Gu Zheng
2015-03-05 9:39 ` Xishi Qiu
2015-03-05 9:45 ` Gu Zheng
2015-03-11 1:12 ` Gu Zheng
2015-03-11 2:51 ` Xie XiuQi
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