netdev - Re: [PATCHv4 bpf-next 3/8] bpf: Add bpf_get_func

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Date:   Sun, 18 Jul 2021 21:30:46 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alan Maguire <alan.maguire@...cle.com>
Subject: Re: [PATCHv4 bpf-next 3/8] bpf: Add bpf_get_func_ip helper for
 tracing programs

On Thu, Jul 15, 2021 at 06:09:22PM -0700, Alexei Starovoitov wrote:
> On Wed, Jul 14, 2021 at 2:44 AM Jiri Olsa <jolsa@...hat.com> wrote:
> >
> > Adding bpf_get_func_ip helper for BPF_PROG_TYPE_TRACING programs,
> > specifically for all trampoline attach types.
> >
> > The trampoline's caller IP address is stored in (ctx - 8) address.
> > so there's no reason to actually call the helper, but rather fixup
> > the call instruction and return [ctx - 8] value directly (suggested
> > by Alexei).
> >
> > [fixed has_get_func_ip wrong return type]
> > Reported-by: kernel test robot <lkp@...el.com>
> > Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> I removed these tags, since they don't correspond to any real commit in the git.
> Otherwise all patches would have been full of such things when patch series
> go through iterations. Also fixed a few typos here and there,
> manually rebased and applied.
> Thanks!
> 

thanks,
jirka