Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init()
From: Matthew Wilcox <hidden>
Date: 2021-07-29 13:55:27
Also in:
linux-mm, lkml
On Thu, Jul 29, 2021 at 08:57:54PM +0800, Miaohe Lin wrote:
rtpn might be NULL in very rare case. We have better to check it before dereferencing it. Since memcg can live with NULL rb_tree_per_node in soft_limit_tree, warn this case and continue.
Why would we need to warn? the GFP flags don't contain NOWARN, so we already know an allocation failed.