Messages in this thread | | | Date | Thu, 29 Jul 2021 14:52:31 +0100 | From | Matthew Wilcox <> | Subject | Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() |
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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.
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