netdev - Re: [kbuild-all] [vhost:vhost 19/20] Warning: arch/x86/tools/test_get_len found difference at <pm_restore_gfp

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Date:   Thu, 8 Feb 2018 08:37:33 +0800
From:   Philip Li <philip.li@...el.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        kbuild test robot <fengguang.wu@...el.com>,
        kvm@...r.kernel.org, netdev@...r.kernel.org,
        Liang Li <liang.z.li@...el.com>,
        virtualization@...ts.linux-foundation.org,
        Wei Wang <wei.w.wang@...el.com>, kbuild-all@...org,
        alexei.starovoitov@...il.com
Subject: Re: [kbuild-all] [vhost:vhost 19/20] Warning:
 arch/x86/tools/test_get_len found difference at
 <pm_restore_gfp_mask>:ffffffff811aa5f0

On Thu, Feb 08, 2018 at 01:25:39AM +0100, Daniel Borkmann wrote:
> On 02/08/2018 01:20 AM, Philip Li wrote:
> > On Thu, Feb 08, 2018 at 02:09:41AM +0200, Michael S. Tsirkin wrote:
> >> On Wed, Feb 07, 2018 at 03:02:57PM +0800, kbuild test robot wrote:
> >>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost
> >>> head:   96bcd04462b99e2c80e09f6537770a0ca6b288d0
> >>> commit: cc1d1dc07885803981520a5303ef5b130f2ca2e8 [19/20] mm: support reporting free page blocks
> >>> config: x86_64-rhel
> >>> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> >>> reproduce:
> >>>         git checkout cc1d1dc07885803981520a5303ef5b130f2ca2e8
> >>>         # save the attached .config to linux build tree
> >>>         make ARCH=x86_64 
> >>>
> >>> All warnings (new ones prefixed by >>):
> >>
> >> I'm sorry, what exactly does this mean?
> > sorry that the script has issue to provide empty warnings here, which
> > was supposed to list warnings with >> added to new ones like below.
> > 
> >    In file included from kernel//bpf/core.c:29:0:
> >>> include/linux/bpf.h:72:8: error: duplicate member 'security'
> >      void *security;
> >            ^
> > 
> > We will follow up to check what goes wrong.
> 
> Certainly odd, even in that tree/commit/header [0] I cannot see a duplicate
> security member in struct bpf_map.
that is one example i try to show what looks like for the >> prefix, and i copy
it from https://lists.01.org/pipermail/kbuild-all/2018-February/042706.html, which
is not for vhost repo.

Here for this report, the issue is as title "Warning: arch/x86/tools/test_get_len found difference at <pm_restore_gfp_mask>:ffffffff811aa5f0".

> 
>   [0] https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/tree/include/linux/bpf.h?h=vhost&id=cc1d1dc07885803981520a5303ef5b130f2ca2e8#n45