linux-kernel - Re: [PATCH bpf-next v4 28/30] bpf: eliminate rlimit-based memory accounting infra for bpf maps

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Date:   Fri, 21 Aug 2020 11:23:21 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Roman Gushchin <guro@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, kernel-team@...com,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>, linux-mm@...ck.org
Subject: Re: [PATCH bpf-next v4 28/30] bpf: eliminate rlimit-based memory
 accounting infra for bpf maps

On Fri, Aug 21, 2020 at 08:01:32AM -0700, Roman Gushchin wrote:
>  
> diff --git a/tools/testing/selftests/bpf/progs/map_ptr_kern.c b/tools/testing/selftests/bpf/progs/map_ptr_kern.c
> index 473665cac67e..49d1dcaf7999 100644
> --- a/tools/testing/selftests/bpf/progs/map_ptr_kern.c
> +++ b/tools/testing/selftests/bpf/progs/map_ptr_kern.c
> @@ -26,17 +26,12 @@ __u32 g_line = 0;
>  		return 0;	\
>  })
>  
> -struct bpf_map_memory {
> -	__u32 pages;
> -} __attribute__((preserve_access_index));
> -
>  struct bpf_map {
>  	enum bpf_map_type map_type;
>  	__u32 key_size;
>  	__u32 value_size;
>  	__u32 max_entries;
>  	__u32 id;
> -	struct bpf_map_memory memory;
>  } __attribute__((preserve_access_index));

hmm. Did you build selftests?

progs/map_ptr_kern.c:45:14: error: no member named 'memory' in 'struct bpf_map'
        VERIFY(map->memory.pages > 0);
               ~~~  ^
progs/map_ptr_kern.c:25:8: note: expanded from macro 'VERIFY'