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From:   Shyam Saini <mayhs11saini@gmail.com>
Date:   Mon, 15 Apr 2019 12:43:39 +0530
Message-ID: <CAOfkYf5FZdN3v9pkcdNmyJM5O=789bKwFmFsMTp20RE=gVgwqQ@mail.gmail.com>
Subject: Re: [PATCH 1/2] include: linux: Regularise the use of FIELD_SIZEOF macro
To:     Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc:     Shyam Saini <shyam.saini@amarulasolutions.com>,
        Kernel Hardening <kernel-hardening@lists.openwall.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>,
        linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
        intel-gvt-dev@lists.freedesktop.org,
        intel-gfx@lists.freedesktop.org,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Network Development <netdev@vger.kernel.org>,
        linux-ext4@vger.kernel.org, devel@lists.orangefs.org,
        linux-mm <linux-mm@kvack.org>, linux-sctp@vger.kernel.org,
        bpf <bpf@vger.kernel.org>, kvm@vger.kernel.org
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Hi,

On Mon, Apr 15, 2019 at 11:13 AM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> On Sun, Apr 14, 2019 at 2:15 AM Shyam Saini
> <shyam.saini@amarulasolutions.com> wrote:
> >
> > Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD
> > and FIELD_SIZEOF which are used to calculate the size of a member of
> > structure, so to bring uniformity in entire kernel source tree lets use
> > FIELD_SIZEOF and replace all occurrences of other two macros with this.
> >
> > For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and
> > tools/testing/selftests/bpf/bpf_util.h and remove its defination from
> > include/linux/kernel.h
> >
> > Signed-off-by: Shyam Saini <shyam.saini@amarulasolutions.com>
> > ---
> >  arch/arm64/include/asm/processor.h                 | 10 +++++-----
> >  arch/mips/cavium-octeon/executive/cvmx-bootmem.c   |  2 +-
> >  drivers/gpu/drm/i915/gvt/scheduler.c               |  2 +-
> >  drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c |  4 ++--
> >  fs/befs/linuxvfs.c                                 |  2 +-
> >  fs/ext2/super.c                                    |  2 +-
> >  fs/ext4/super.c                                    |  2 +-
> >  fs/freevxfs/vxfs_super.c                           |  2 +-
> >  fs/orangefs/super.c                                |  2 +-
> >  fs/ufs/super.c                                     |  2 +-
> >  include/linux/kernel.h                             |  9 ---------
> >  include/linux/slab.h                               |  2 +-
> >  include/linux/stddef.h                             | 11 ++++++++++-
> >  kernel/fork.c                                      |  2 +-
> >  kernel/utsname.c                                   |  2 +-
> >  net/caif/caif_socket.c                             |  2 +-
> >  net/core/skbuff.c                                  |  2 +-
> >  net/ipv4/raw.c                                     |  2 +-
> >  net/ipv6/raw.c                                     |  2 +-
> >  net/sctp/socket.c                                  |  4 ++--
> >  tools/testing/selftests/bpf/bpf_util.h             | 11 ++++++++++-
>
> tools/ directory is for user space pieces that don't include kernel's include.
> I bet your pathes break the user space builds.

I think it shouldn't because I haven't included any kernel header in
tool/ files, instead
I have introduced definition of macro in tool/ , so this patch doesn't
create any dependency
on kernel headers.

Thanks a lot,
Shyam