netdev - Re: [PATCH bpf-next] samples/bpf: fix broken bpf programs due to function inlining

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Message-ID: <CAEf4BzZabPo=r4BGbVnzyC5G37DbdFGp8f67ZdV8WLiE-pOT+Q@mail.gmail.com>
Date:   Tue, 8 Mar 2022 09:56:41 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Muhammad Falak R Wani <falakreyaz@...il.com>
Cc:     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>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next] samples/bpf: fix broken bpf programs due to
 function inlining

On Tue, Mar 8, 2022 at 2:43 AM Muhammad Falak R Wani
<falakreyaz@...il.com> wrote:
>
> On Mon, Mar 07, 2022 at 10:11:36PM -0800, Andrii Nakryiko wrote:
> > On Sun, Mar 6, 2022 at 4:15 AM Muhammad Falak R Wani
> > <falakreyaz@...il.com> wrote:
> > >
> > > commit: "be6bfe36db17 block: inline hot paths of blk_account_io_*()"
> > > inlines the function `blk_account_io_done`. As a result we can't attach a
> > > kprobe to the function anymore. Use `__blk_account_io_done` instead.
> > >
> > > Signed-off-by: Muhammad Falak R Wani <falakreyaz@...il.com>
> > > ---
> > >  samples/bpf/task_fd_query_kern.c | 2 +-
> > >  samples/bpf/tracex3_kern.c       | 2 +-
> > >  2 files changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/samples/bpf/task_fd_query_kern.c b/samples/bpf/task_fd_query_kern.c
> > > index c821294e1774..186ac0a79c0a 100644
> > > --- a/samples/bpf/task_fd_query_kern.c
> > > +++ b/samples/bpf/task_fd_query_kern.c
> >
> > samples/bpf/task_fd_query_user.c also needs adjusting, no? Have you
> > tried running those samples?
> Aplologies, I ran the `tracex3` program, but missed to verify `task_fd_query`. Should I send a V2
> where I modify only the `tracex3` ?

No, send a patch fixing everything in one patch