linux-kernel - Re: [PATCH 2/5] libbpf: add missing typedef

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Message-ID: <20190520182554.GI10244@mini-arch>
Date:   Mon, 20 May 2019 11:25:54 -0700
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     xdp-newbies@...r.kernel.org, bpf@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH 2/5] libbpf: add missing typedef

On 05/20, Matteo Croce wrote:
> On Mon, May 20, 2019 at 6:53 PM Stanislav Fomichev <sdf@...ichev.me> wrote:
> >
> > On 05/18, Matteo Croce wrote:
> > > Sync tools/include/linux/types.h with the UAPI one to fix this build error:
> > >
> > > make -C samples/bpf/../../tools/lib/bpf/ RM='rm -rf' LDFLAGS= srctree=samples/bpf/../../ O=
> > >   HOSTCC  samples/bpf/sock_example
> > > In file included from samples/bpf/sock_example.c:27:
> > > /usr/include/linux/ip.h:102:2: error: unknown type name ‘__sum16’
> > >   102 |  __sum16 check;
> > >       |  ^~~~~~~
> > > make[2]: *** [scripts/Makefile.host:92: samples/bpf/sock_example] Error 1
> > > make[1]: *** [Makefile:1763: samples/bpf/] Error 2
> > >
> > > Signed-off-by: Matteo Croce <mcroce@...hat.com>
> > > ---
> > >  tools/include/linux/types.h | 3 +++
> > >  1 file changed, 3 insertions(+)
> > >
> > > diff --git a/tools/include/linux/types.h b/tools/include/linux/types.h
> > > index 154eb4e3ca7c..5266dbfee945 100644
> > > --- a/tools/include/linux/types.h
> > > +++ b/tools/include/linux/types.h
> > > @@ -58,6 +58,9 @@ typedef __u32 __bitwise __be32;
> > >  typedef __u64 __bitwise __le64;
> > >  typedef __u64 __bitwise __be64;
> > >
> > > +typedef __u16 __bitwise __sum16;
> > > +typedef __u32 __bitwise __wsum;
> > If you do that, you should probably remove 'typedef __u16 __sum16;'
> > from test_progs.h:
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/tools/testing/selftests/bpf/test_progs.h#n13
> >
> > > +
> > >  typedef struct {
> > >       int counter;
> > >  } atomic_t;
> > > --
> > > 2.21.0
> > >
> 
> Hi,
> 
> I see test_progs.h only included in tools/testing/selftests/bpf/prog_tests/*,
> so maybe it's unreladed to my change in samples/bpf/.
> Maybe in a different patchset.
Yes, I'm just saying that now that you have __sum16 defined in
tools/include/linux/types.h you can have another patch to remove
that custom __sum16 typedef from tests_progs.h