linux-kernel - Re: [PATCH v6 07/12] samples/bpf/offwaketime_kern: make sched_switch tracepoint args adopt to comm size change

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Message-ID: <CALOAHbAqu3zrFiu-36dnPw-Jchz_Be9W_AbSFXFYsH0kNacGeg@mail.gmail.com>
Date:   Tue, 26 Oct 2021 09:56:53 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Valentin Schneider <valentin.schneider@....com>,
        Qiang Zhang <qiang.zhang@...driver.com>,
        robdclark <robdclark@...omium.org>,
        christian <christian@...uner.io>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        dennis.dalessandro@...nelisnetworks.com,
        mike.marciniszyn@...nelisnetworks.com, dledford@...hat.com,
        jgg@...pe.ca, linux-rdma@...r.kernel.org,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel test robot <oliver.sang@...el.com>,
        kbuild test robot <lkp@...el.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH v6 07/12] samples/bpf/offwaketime_kern: make sched_switch
 tracepoint args adopt to comm size change

On Tue, Oct 26, 2021 at 5:21 AM Kees Cook <keescook@...omium.org> wrote:
>
> On Mon, Oct 25, 2021 at 08:33:10AM +0000, Yafang Shao wrote:
> > The sched:sched_switch tracepoint is derived from kernel, we should make
> > its args compitable with the kernel.
> >
> > Signed-off-by: Yafang Shao <laoar.shao@...il.com>
> > Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> > Cc: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
> > Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Al Viro <viro@...iv.linux.org.uk>
> > Cc: Kees Cook <keescook@...omium.org>
> > Cc: Petr Mladek <pmladek@...e.com>
> > ---
> >  samples/bpf/offwaketime_kern.c | 4 ++--
>
> Seems this should be merged with the prior bpf samples patch?
>

Sure

>
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/samples/bpf/offwaketime_kern.c b/samples/bpf/offwaketime_kern.c
> > index 4866afd054da..eb4d94742e6b 100644
> > --- a/samples/bpf/offwaketime_kern.c
> > +++ b/samples/bpf/offwaketime_kern.c
> > @@ -113,11 +113,11 @@ static inline int update_counts(void *ctx, u32 pid, u64 delta)
> >  /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */
> >  struct sched_switch_args {
> >       unsigned long long pad;
> > -     char prev_comm[16];
> > +     char prev_comm[TASK_COMM_LEN];
> >       int prev_pid;
> >       int prev_prio;
> >       long long prev_state;
> > -     char next_comm[16];
> > +     char next_comm[TASK_COMM_LEN];
> >       int next_pid;
> >       int next_prio;
> >  };
> > --
> > 2.17.1
> >
>
> --
> Kees Cook



-- 
Thanks
Yafang