netdev - Re: [PATCH v3 bpf-next 4/9] libbpf: add kprobe/uprobe attach API

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Message-ID: <CAEf4Bzb-EM41TLAkshQa=nVwiVuYnEYyhVL38gcaG=OaHoJJ6Q@mail.gmail.com>
Date:   Mon, 8 Jul 2019 10:58:14 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Matt Hart <matthew.hart@...aro.org>
Cc:     Andrii Nakryiko <andriin@...com>, Alexei Starovoitov <ast@...com>,
        bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Networking <netdev@...r.kernel.org>,
        Stanislav Fomichev <sdf@...ichev.me>
Subject: Re: [PATCH v3 bpf-next 4/9] libbpf: add kprobe/uprobe attach API

On Mon, Jul 8, 2019 at 8:11 AM Matt Hart <matthew.hart@...aro.org> wrote:
>
> Hi all,
>
> I bisected a perf build error on ARMv7 to this patch:
> libbpf.c: In function ‘perf_event_open_probe’:
> libbpf.c:4112:17: error: cast from pointer to integer of different
> size [-Werror=pointer-to-int-cast]
>   attr.config1 = (uint64_t)(void *)name; /* kprobe_func or uprobe_path */
>                  ^
>
> Is this a known issue?

No, thanks for reporting!

It should be

attr.config1 = (uint64_t)(uintptr_t)(void *)name;

to avoid warning on 32-bit architectures.

I'll post a fix later today, but if you could verify this fixes
warning for you, I'd really appreciate that! Thanks!