Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init()

[Miaohe Lin]

On 2021/7/29 21:52, Matthew Wilcox wrote:
> 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.

I see. Will remove it. Many thanks!

> .
>