netdev - Re: [PATCH v2 bpf] libbpf: fix missing _

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Date:   Thu, 18 Jul 2019 10:31:47 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Kernel Team <kernel-team@...com>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH v2 bpf] libbpf: fix missing __WORDSIZE definition

On Thu, Jul 18, 2019 at 10:30 AM Andrii Nakryiko <andriin@...com> wrote:
>
> hashmap.h depends on __WORDSIZE being defined. It is defined by
> glibc/musl in different headers. It's an explicit goal for musl to be
> "non-detectable" at compilation time, so instead include glibc header if
> glibc is explicitly detected and fall back to musl header otherwise.
>
> Fixes: e3b924224028 ("libbpf: add resizable non-thread safe internal hashmap")
> Reported-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Arnaldo,

As it compiled fine for me even before and I don't have a musl set up,
could you please verify this fixes the issue for perf for all your
test environments?

Thanks!

> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
>  tools/lib/bpf/hashmap.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/tools/lib/bpf/hashmap.h b/tools/lib/bpf/hashmap.h
> index 03748a742146..bae8879cdf58 100644
> --- a/tools/lib/bpf/hashmap.h
> +++ b/tools/lib/bpf/hashmap.h
> @@ -10,6 +10,11 @@
>
>  #include <stdbool.h>
>  #include <stddef.h>
> +#ifdef __GLIBC__
> +#include <bits/wordsize.h>
> +#else
> +#include <bits/reg.h>
> +#endif
>  #include "libbpf_internal.h"
>
>  static inline size_t hash_bits(size_t h, int bits)
> --
> 2.17.1
>