Re: [PATCH v5 2/3] mm/mempolicy: add set_mempolicy_home_node syscall

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On Tue, 30 Nov 2021 14:29:02 +0530 "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx> wrote:

> > What's the thinking here?  The node can later be offlined and the
> > kernel takes no action to reset home nodes, so why not permit setting a
> > presently-offline node as the home node?  Checking here seems rather
> > arbitrary?
> 
> The node online check was needed to avoid accessing 
> uninitialised pgdat structure. Such an access can result in
> below crash

Oh.  This is unobvious from reading the code.  Which calls for a
comment, no?




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