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Date:   Tue, 26 May 2020 15:34:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Hangbin Liu <liuhangbin@...il.com>, bpf@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, netdev@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jiri Benc <jbenc@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>, ast@...nel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: Re: [PATCHv3 bpf-next 1/2] xdp: add a new helper for dev map
 multicast support

Hi Hangbin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on bpf-next/master]
[also build test WARNING on net-next/master next-20200525]
[cannot apply to bpf/master net/master linus/master v5.7-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Hangbin-Liu/xdp-add-dev-map-multicast-support/20200523-141019
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: c6x-randconfig-r003-20200526 (attached as .config)
compiler: c6x-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=c6x 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

In file included from include/asm-generic/atomic.h:12,
from ./arch/c6x/include/generated/asm/atomic.h:1,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/c6x/include/asm/bitops.h:87,
from include/linux/bitops.h:29,
from include/linux/kernel.h:12,
from include/linux/list.h:9,
from include/linux/module.h:12,
from net/core/filter.c:20:
net/core/filter.c: In function 'bpf_clear_redirect_map':
arch/c6x/include/asm/cmpxchg.h:55:3: warning: value computed is not used [-Wunused-value]
55 |  ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),           |  ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
56 |            (unsigned long)(o),          |            ~~~~~~~~~~~~~~~~~~~~~
57 |            (unsigned long)(n),          |            ~~~~~~~~~~~~~~~~~~~~~
58 |            sizeof(*(ptr))))
|            ~~~~~~~~~~~~~~~~
include/asm-generic/cmpxchg.h:106:28: note: in expansion of macro 'cmpxchg_local'
106 | #define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
|                            ^~~~~~~~~~~~~
net/core/filter.c:3534:4: note: in expansion of macro 'cmpxchg'
3534 |    cmpxchg(&ri->map, map, NULL);
|    ^~~~~~~
net/core/filter.c: At top level:
>> net/core/filter.c:3787:20: warning: initialized field overwritten [-Woverride-init]
3787 |  .arg1_type      = ARG_CONST_MAP_PTR,
|                    ^~~~~~~~~~~~~~~~~
net/core/filter.c:3787:20: note: (near initialization for 'bpf_xdp_redirect_map_multi_proto.<anonymous>.<anonymous>.arg1_type')
/tmp/cc2n7hPR.s: Assembler messages:
/tmp/cc2n7hPR.s:69347: Warning: ignoring changed section type for .far
/tmp/cc2n7hPR.s:69347: Warning: ignoring changed section attributes for .far
/tmp/cc2n7hPR.s:69454: Warning: ignoring changed section type for .far
/tmp/cc2n7hPR.s:69454: Warning: ignoring changed section attributes for .far
/tmp/cc2n7hPR.s:69503: Warning: ignoring changed section type for .far
/tmp/cc2n7hPR.s:69503: Warning: ignoring changed section attributes for .far
--
In file included from include/asm-generic/atomic.h:12,
from ./arch/c6x/include/generated/asm/atomic.h:1,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/c6x/include/asm/bitops.h:87,
from include/linux/bitops.h:29,
from include/linux/kernel.h:12,
from include/linux/list.h:9,
from include/linux/module.h:12,
from net/core/filter.c:20:
net/core/filter.c: In function 'bpf_clear_redirect_map':
arch/c6x/include/asm/cmpxchg.h:55:3: warning: value computed is not used [-Wunused-value]
55 |  ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),           |  ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
56 |            (unsigned long)(o),          |            ~~~~~~~~~~~~~~~~~~~~~
57 |            (unsigned long)(n),          |            ~~~~~~~~~~~~~~~~~~~~~
58 |            sizeof(*(ptr))))
|            ~~~~~~~~~~~~~~~~
include/asm-generic/cmpxchg.h:106:28: note: in expansion of macro 'cmpxchg_local'
106 | #define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
|                            ^~~~~~~~~~~~~
net/core/filter.c:3534:4: note: in expansion of macro 'cmpxchg'
3534 |    cmpxchg(&ri->map, map, NULL);
|    ^~~~~~~
net/core/filter.c: At top level:
>> net/core/filter.c:3787:20: warning: initialized field overwritten [-Woverride-init]
3787 |  .arg1_type      = ARG_CONST_MAP_PTR,
|                    ^~~~~~~~~~~~~~~~~
net/core/filter.c:3787:20: note: (near initialization for 'bpf_xdp_redirect_map_multi_proto.<anonymous>.<anonymous>.arg1_type')
/tmp/ccHtg48M.s: Assembler messages:
/tmp/ccHtg48M.s:69347: Warning: ignoring changed section type for .far
/tmp/ccHtg48M.s:69347: Warning: ignoring changed section attributes for .far
/tmp/ccHtg48M.s:69454: Warning: ignoring changed section type for .far
/tmp/ccHtg48M.s:69454: Warning: ignoring changed section attributes for .far
/tmp/ccHtg48M.s:69503: Warning: ignoring changed section type for .far
/tmp/ccHtg48M.s:69503: Warning: ignoring changed section attributes for .far

vim +3787 net/core/filter.c

  3781	
  3782	static const struct bpf_func_proto bpf_xdp_redirect_map_multi_proto = {
  3783		.func           = bpf_xdp_redirect_map_multi,
  3784		.gpl_only       = false,
  3785		.ret_type       = RET_INTEGER,
  3786		.arg1_type      = ARG_CONST_MAP_PTR,
> 3787		.arg1_type      = ARG_CONST_MAP_PTR,
  3788		.arg3_type      = ARG_ANYTHING,
  3789	};
  3790	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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