linux-kernel - Re: [PATCH bpf-next v2 6/6] selftests/bpf: Add a series of tests for bpf

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Date:   Tue, 6 Apr 2021 17:40:30 +0200
From:   Florent Revest <revest@...omium.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Yonghong Song <yhs@...com>, KP Singh <kpsingh@...nel.org>,
        Brendan Jackman <jackmanb@...omium.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 6/6] selftests/bpf: Add a series of tests for bpf_snprintf

On Sat, Mar 27, 2021 at 12:05 AM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Tue, Mar 23, 2021 at 7:23 PM Florent Revest <revest@...omium.org> wrote:
> >
> > This exercises most of the format specifiers when things go well.
> >
> > Signed-off-by: Florent Revest <revest@...omium.org>
> > ---
>
> Looks good. Please add a no-argument test case as well.

Agreed

> Acked-by: Andrii Nakryiko <andrii@...nel.org>
>
> >  .../selftests/bpf/prog_tests/snprintf.c       | 65 +++++++++++++++++++
> >  .../selftests/bpf/progs/test_snprintf.c       | 59 +++++++++++++++++
> >  2 files changed, 124 insertions(+)
> >  create mode 100644 tools/testing/selftests/bpf/prog_tests/snprintf.c
> >  create mode 100644 tools/testing/selftests/bpf/progs/test_snprintf.c
> >
>
> [...]
>
> > +
> > +SEC("raw_tp/sys_enter")
> > +int handler(const void *ctx)
> > +{
> > +       /* Convenient values to pretty-print */
> > +       const __u8 ex_ipv4[] = {127, 0, 0, 1};
> > +       const __u8 ex_ipv6[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
> > +       const char str1[] = "str1";
> > +       const char longstr[] = "longstr";
> > +       extern const void schedule __ksym;
>
> oh, fancy. I'd move it out of this function into global space, though,
> to make it more apparent. I almost missed that it's a special one.

Just schedule? Alright.