linux-kernel - Re: [PATCH v2] libbpf: Fix is_pow_of

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Message-ID: <CAP-5=fVhVLWg+c=WJyOD8FByg_4n6V0SLSLnaw7K0J=-oNnuaA@mail.gmail.com>
Date:   Thu, 2 Jun 2022 22:57:13 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yuze Chi <chiyuze@...gle.com>
Subject: Re: [PATCH v2] libbpf: Fix is_pow_of_2

On Thu, Jun 2, 2022 at 10:52 PM Ian Rogers <irogers@...gle.com> wrote:
>
> From: Yuze Chi <chiyuze@...gle.com>
>
> Move the correct definition from linker.c into libbpf_internal.h.
>

Sorry I missed this:
Fixes: 0087a681fa8c ("libbpf: Automatically fix up
BPF_MAP_TYPE_RINGBUF size, if necessary")

Thanks,
Ian

> Reported-by: Yuze Chi <chiyuze@...gle.com>
> Signed-off-by: Yuze Chi <chiyuze@...gle.com>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/lib/bpf/libbpf.c          | 5 -----
>  tools/lib/bpf/libbpf_internal.h | 5 +++++
>  tools/lib/bpf/linker.c          | 5 -----
>  3 files changed, 5 insertions(+), 10 deletions(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 3f4f18684bd3..346f941bb995 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -4954,11 +4954,6 @@ bpf_object__populate_internal_map(struct bpf_object *obj, struct bpf_map *map)
>
>  static void bpf_map__destroy(struct bpf_map *map);
>
> -static bool is_pow_of_2(size_t x)
> -{
> -       return x && (x & (x - 1));
> -}
> -
>  static size_t adjust_ringbuf_sz(size_t sz)
>  {
>         __u32 page_sz = sysconf(_SC_PAGE_SIZE);
> diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
> index 4abdbe2fea9d..ef5d975078e5 100644
> --- a/tools/lib/bpf/libbpf_internal.h
> +++ b/tools/lib/bpf/libbpf_internal.h
> @@ -580,4 +580,9 @@ struct bpf_link * usdt_manager_attach_usdt(struct usdt_manager *man,
>                                            const char *usdt_provider, const char *usdt_name,
>                                            __u64 usdt_cookie);
>
> +static inline bool is_pow_of_2(size_t x)
> +{
> +       return x && (x & (x - 1)) == 0;
> +}
> +
>  #endif /* __LIBBPF_LIBBPF_INTERNAL_H */
> diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
> index 9aa016fb55aa..85c0fddf55d1 100644
> --- a/tools/lib/bpf/linker.c
> +++ b/tools/lib/bpf/linker.c
> @@ -697,11 +697,6 @@ static int linker_load_obj_file(struct bpf_linker *linker, const char *filename,
>         return err;
>  }
>
> -static bool is_pow_of_2(size_t x)
> -{
> -       return x && (x & (x - 1)) == 0;
> -}
> -
>  static int linker_sanity_check_elf(struct src_obj *obj)
>  {
>         struct src_sec *sec;
> --
> 2.36.1.255.ge46751e96f-goog
>