linux-kernel - [toke:xdp-queueing-03 7/9] include/linux/bpf.h:2064:9: warning: incompatible pointer to integer conversion returning 'void *' from a function with result type 'int'

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Date:   Mon, 14 Mar 2022 07:45:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: [toke:xdp-queueing-03 7/9] include/linux/bpf.h:2064:9: warning:
 incompatible pointer to integer conversion returning 'void *' from a
 function with result type 'int'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-03
head:   3e7f25d58b1bfd5ad623678bf9e11f27c98a8094
commit: 28d9ca982b9ae96bcad2bee81647ba18ae049a69 [7/9] bpf: Enable direct packet access for dequeue packets
config: hexagon-randconfig-r045-20220313 (https://download.01.org/0day-ci/archive/20220314/202203140739.otiRAMwr-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0467eb2cb7654c15ae366967ef35093c5724c416)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git/commit/?id=28d9ca982b9ae96bcad2bee81647ba18ae049a69
        git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git
        git fetch --no-tags toke xdp-queueing-03
        git checkout 28d9ca982b9ae96bcad2bee81647ba18ae049a69
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash net/core/

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

All warnings (new ones prefixed by >>):

   In file included from net/core/sock.c:133:
   In file included from include/linux/filter.h:9:
>> include/linux/bpf.h:2064:9: warning: incompatible pointer to integer conversion returning 'void *' from a function with result type 'int' [-Wint-conversion]
           return ERR_PTR(-EINVAL);
                  ^~~~~~~~~~~~~~~~
   1 warning generated.
--
   In file included from net/core/dev.c:95:
>> include/linux/bpf.h:2064:9: warning: incompatible pointer to integer conversion returning 'void *' from a function with result type 'int' [-Wint-conversion]
           return ERR_PTR(-EINVAL);
                  ^~~~~~~~~~~~~~~~
   net/core/dev.c:5011:1: warning: unused function 'sch_handle_ingress' [-Wunused-function]
   sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
   ^
   net/core/dev.c:5160:19: warning: unused function 'nf_ingress' [-Wunused-function]
   static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
                     ^
   3 warnings generated.
--
   In file included from net/core/filter.c:38:
   In file included from include/linux/skmsg.h:7:
>> include/linux/bpf.h:2064:9: warning: incompatible pointer to integer conversion returning 'void *' from a function with result type 'int' [-Wint-conversion]
           return ERR_PTR(-EINVAL);
                  ^~~~~~~~~~~~~~~~
>> net/core/filter.c:9720:14: warning: incompatible integer to pointer conversion assigning to 'struct btf *' from 'int' [-Wint-conversion]
           btf_vmlinux = bpf_get_btf_vmlinux();
                       ^ ~~~~~~~~~~~~~~~~~~~~~
   net/core/filter.c:9848:14: warning: incompatible integer to pointer conversion assigning to 'struct btf *' from 'int' [-Wint-conversion]
           btf_vmlinux = bpf_get_btf_vmlinux();
                       ^ ~~~~~~~~~~~~~~~~~~~~~
   3 warnings generated.
--
   In file included from net/core/net-traces.c:35:
   In file included from include/trace/events/tcp.h:12:
   In file included from include/net/tcp.h:35:
   In file included from include/net/sock_reuseport.h:5:
   In file included from include/linux/filter.h:9:
>> include/linux/bpf.h:2064:9: warning: incompatible pointer to integer conversion returning 'void *' from a function with result type 'int' [-Wint-conversion]
           return ERR_PTR(-EINVAL);
                  ^~~~~~~~~~~~~~~~
   In file included from net/core/net-traces.c:50:
   In file included from include/trace/events/neigh.h:255:
   In file included from include/trace/define_trace.h:102:
   In file included from include/trace/trace_events.h:873:
   include/trace/events/neigh.h:42:20: warning: variable 'pin6' set but not used [-Wunused-but-set-variable]
                   struct in6_addr *pin6;
                                    ^
   2 warnings generated.


vim +2064 include/linux/bpf.h

  2061	
  2062	static inline bpf_get_btf_vmlinux(void)
  2063	{
> 2064		return ERR_PTR(-EINVAL);
  2065	}
  2066	

---
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