linux-kernel - [toke:xdp-queueing-03 7/9] include/linux/bpf.h:2064:16: warning: returning 'void *' from a function with return type 'int' makes integer from pointer without a cast

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Date:   Mon, 14 Mar 2022 08:16:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     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:2064:16: warning:
 returning 'void *' from a function with return type 'int' makes integer from
 pointer without a cast

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: nds32-allnoconfig (https://download.01.org/0day-ci/archive/20220314/202203140827.59L5Sn1E-lkp@intel.com/config)
compiler: nds32le-linux-gcc (GCC) 11.2.0
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
        # 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=gcc-11.2.0 make.cross O=build_dir ARCH=nds32 SHELL=/bin/bash

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 kernel/fork.c:99:
   include/linux/bpf.h:2062:15: error: return type defaults to 'int' [-Werror=return-type]
    2062 | static inline bpf_get_btf_vmlinux(void)
         |               ^~~~~~~~~~~~~~~~~~~
   include/linux/bpf.h: In function 'bpf_get_btf_vmlinux':
>> include/linux/bpf.h:2064:16: warning: returning 'void *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
    2064 |         return ERR_PTR(-EINVAL);
         |                ^~~~~~~~~~~~~~~~
   kernel/fork.c: At top level:
   kernel/fork.c:162:13: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes]
     162 | void __weak arch_release_task_struct(struct task_struct *tsk)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:764:20: warning: no previous prototype for 'arch_task_cache_init' [-Wmissing-prototypes]
     764 | void __init __weak arch_task_cache_init(void) { }
         |                    ^~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:859:12: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes]
     859 | int __weak arch_dup_task_struct(struct task_struct *dst,
         |            ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from include/linux/filter.h:9,
                    from kernel/sysctl.c:35:
   include/linux/bpf.h:2062:15: error: return type defaults to 'int' [-Werror=return-type]
    2062 | static inline bpf_get_btf_vmlinux(void)
         |               ^~~~~~~~~~~~~~~~~~~
   include/linux/bpf.h: In function 'bpf_get_btf_vmlinux':
>> include/linux/bpf.h:2064:16: warning: returning 'void *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
    2064 |         return ERR_PTR(-EINVAL);
         |                ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from include/linux/filter.h:9,
                    from kernel/kallsyms.c:25:
   include/linux/bpf.h:2062:15: error: return type defaults to 'int' [-Werror=return-type]
    2062 | static inline bpf_get_btf_vmlinux(void)
         |               ^~~~~~~~~~~~~~~~~~~
   include/linux/bpf.h: In function 'bpf_get_btf_vmlinux':
>> include/linux/bpf.h:2064:16: warning: returning 'void *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
    2064 |         return ERR_PTR(-EINVAL);
         |                ^~~~~~~~~~~~~~~~
   kernel/kallsyms.c: At top level:
   kernel/kallsyms.c:587:12: warning: no previous prototype for 'arch_get_kallsym' [-Wmissing-prototypes]
     587 | int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
         |            ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


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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