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

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Message-ID: <CAH+k93G=qGLfEKe+3dSZPKhmxrc8JiPqDppGa-yLSwaQYRJU=Q@mail.gmail.com>
Date:   Mon, 8 Jul 2019 20:27:02 +0100
From:   Matt Hart <matthew.hart@...aro.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
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, 8 Jul 2019 at 18:58, Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:
>
> 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.

Tested with manual change and can confirm perf now builds without errors.

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