Re: [PATCH v2 bpf-next 02/14] bpf: introduce cgroup storage maps

[Roman Gushchin <guro@fb.com>]

On Mon, Jul 09, 2018 at 10:37:45AM +0200, Daniel Borkmann wrote:
> On 07/08/2018 12:35 AM, Alexei Starovoitov wrote:
> > On Fri, Jul 06, 2018 at 02:52:32PM -0700, Roman Gushchin wrote:
> >> On Fri, Jul 06, 2018 at 10:42:39PM +0800, kbuild test robot wrote:
> >>> Hi Roman,
> >>>
> >>> Thank you for the patch! Yet something to improve:
> >>>
> >>> [auto build test ERROR on bpf-next/master]
> >>>
> >>> url:    https://github.com/0day-ci/linux/commits/Roman-Gushchin/bpf-cgroup-local-storage/20180706-055938
> >>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
> >>> config: s390-performance_defconfig (attached as .config)
> >>> compiler: s390x-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
> >>> reproduce:
> >>>         wget https://urldefense.proofpoint.com/v2/url?u=https-3A__raw.githubusercontent.com_intel_lkp-2Dtests_master_sbin_make.cross&d=DwIBAg&c=5VD0RTtNlTh3ycd41b3MUw&r=jJYgtDM7QT-W-Fz_d29HYQ&m=ImwiAAR6DVyf5JEcIc5VLF9xY4lfFxVuk8_4BN6I03g&s=r0S7gFQPOZVZagshsK0pL3eU8_GRpD1ywrvYfXJ4yBQ&e= -O ~/bin/make.cross
> >>>         chmod +x ~/bin/make.cross
> >>>         # save the attached .config to linux build tree
> >>>         GCC_VERSION=7.2.0 make.cross ARCH=s390 
> >>>
> >>> All errors (new ones prefixed by >>):
> >>>
> >>>    In file included from kernel//bpf/local_storage.c:2:0:
> >>>    include/linux/bpf-cgroup.h: In function 'cgroup_bpf_prog_attach':
> >>>>> include/linux/bpf-cgroup.h:237:10: error: 'EINVAL' undeclared (first use in this function)
> >>>      return -EINVAL;
> >>>              ^~~~~~
> >>>    include/linux/bpf-cgroup.h:237:10: note: each undeclared identifier is reported only once for each function it appears in
> >>>    include/linux/bpf-cgroup.h: In function 'cgroup_bpf_prog_detach':
> >>>    include/linux/bpf-cgroup.h:243:10: error: 'EINVAL' undeclared (first use in this function)
> >>>      return -EINVAL;
> >>>              ^~~~~~
> >>>    include/linux/bpf-cgroup.h: In function 'cgroup_bpf_prog_query':
> >>>    include/linux/bpf-cgroup.h:249:10: error: 'EINVAL' undeclared (first use in this function)
> >>>      return -EINVAL;
> >>>              ^~~~~~
> >>>
> >>> vim +/EINVAL +237 include/linux/bpf-cgroup.h
> >>>
> >>> 30070984 Daniel Mack 2016-11-23  232  
> >>> fdb5c453 Sean Young  2018-06-19  233  static inline int cgroup_bpf_prog_attach(const union bpf_attr *attr,
> >>> fdb5c453 Sean Young  2018-06-19  234  					 enum bpf_prog_type ptype,
> >>> fdb5c453 Sean Young  2018-06-19  235  					 struct bpf_prog *prog)
> >>> fdb5c453 Sean Young  2018-06-19  236  {
> >>> fdb5c453 Sean Young  2018-06-19 @237  	return -EINVAL;
> >>> fdb5c453 Sean Young  2018-06-19  238  }
> >>> fdb5c453 Sean Young  2018-06-19  239  
> >>>
> >>> :::::: The code at line 237 was first introduced by commit
> >>> :::::: fdb5c4531c1e0e50e609df83f736b6f3a02896e2 bpf: fix attach type BPF_LIRC_MODE2 dependency wrt CONFIG_CGROUP_BPF
> >>>
> >>> :::::: TO: Sean Young <sean@mess.org>
> >>> :::::: CC: Daniel Borkmann <daniel@iogearbox.net>
> >>
> >> These errors have nothing to do with the cgroup local storage patchset.
> >> They do exist in the current bpf-next tree.
> >> Here is the fix.
> >>
> >> Thanks!
> >>
> >> --
> >>
> >> From c0cd59b969e060765514224e31595763213e40f9 Mon Sep 17 00:00:00 2001
> >> From: Roman Gushchin <guro@fb.com>
> >> Date: Fri, 6 Jul 2018 14:34:29 -0700
> >> Subject: [PATCH bpf-next] bpf: include errno.h from bpf-cgroup.h
> >>
> >> Commit fdb5c4531c1e ("bpf: fix attach type BPF_LIRC_MODE2 dependency
> >> wrt CONFIG_CGROUP_BPF") caused some build issues, detected by 0-DAY
> >> kernel test infrastructure.
> >>
> >> The problem is that cgroup_bpf_prog_attach/detach/query() functions
> >> can return -EINVAL error code, which is not defined. Fix this adding
> >> errno.h to includes.
> >>
> >> Fixes: fdb5c4531c1e ("bpf: fix attach type BPF_LIRC_MODE2 dependency
> >> wrt CONFIG_CGROUP_BPF")
> >> Signed-off-by: Roman Gushchin <guro@fb.com>
> >> Cc: Sean Young <sean@mess.org>
> >> Cc: Daniel Borkmann <daniel@iogearbox.net>
> >> Cc: Alexei Starovoitov <ast@kernel.org>
> >> ---
> >>  include/linux/bpf-cgroup.h | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
> >> index 79795c5fa7c3..d50c2f0a655a 100644
> >> --- a/include/linux/bpf-cgroup.h
> >> +++ b/include/linux/bpf-cgroup.h
> >> @@ -2,6 +2,7 @@
> >>  #ifndef _BPF_CGROUP_H
> >>  #define _BPF_CGROUP_H
> >>  
> >> +#include <linux/errno.h>
> >>  #include <linux/jump_label.h>
> >>  #include <uapi/linux/bpf.h>
> > 
> > good catch, but please resend it as a proper patch,
> > since patchwork didn't pick it up.
> > Also the subj should say 'bpf' instead of 'bpf-next', right?
> 
> Yes, this needs to go to bpf tree, since the affected commit went
> there as well.
> 
> I just applied the above fix into bpf tree, thanks.

Thanks, Daniel!