Re: [PATCH v2 bpf-next 14/20] libbpf: Recognize __arena global varaibles.

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On Mon, 2024-02-12 at 16:44 -0800, Alexei Starovoitov wrote:
> > I hit a strange bug when playing with patch. Consider a simple example [0].
> > When the following BPF global variable:
> > 
> >     int __arena * __arena bar;
> > 
> > - is commented -- the test passes;
> > - is uncommented -- in the test fails because global variable 'shared' is NULL.
> 
> Right. That's expected, because __uint(max_entries, 1);
> The test creates an area on 1 page and it's consumed
> by int __arena * __arena bar; variable.
> Of course, one variable doesn't take the whole page.
> There could have been many arena global vars.
> But that page is not available anymore to bpf_arena_alloc_pages,
> so it returns NULL.

My bad, thank you for explaining.





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