linux-kernel - [jolsa-perf:kprobe/multi 8/13] kernel/bpf/syscall.c:3099:32: warning: initialization of 'struct kretprobe *' from 'int' makes pointer from integer without a cast

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Message-ID: <202112280010.ufkJQV03-lkp@intel.com>
Date:   Tue, 28 Dec 2021 00:57:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [jolsa-perf:kprobe/multi 8/13] kernel/bpf/syscall.c:3099:32:
 warning: initialization of 'struct kretprobe *' from 'int' makes pointer
 from integer without a cast

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git kprobe/multi
head:   bc59262730d5cfc95d6cae84f247d2e8690a309b
commit: 9308a22da930865f9cc80a47f3d0ced38aae1a0a [8/13] bpf: Add kprobe link for attaching raw kprobes
config: nds32-randconfig-r032-20211227 (https://download.01.org/0day-ci/archive/20211228/202112280010.ufkJQV03-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/jolsa/perf.git/commit/?id=9308a22da930865f9cc80a47f3d0ced38aae1a0a
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf kprobe/multi
        git checkout 9308a22da930865f9cc80a47f3d0ced38aae1a0a
        # 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 kernel/bpf/

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 >>):

   kernel/bpf/syscall.c: In function 'bpf_perf_link_attach':
   kernel/bpf/syscall.c:3021:17: error: 'ENOTSUP' undeclared (first use in this function); did you mean 'ENOTSUPP'?
    3021 |         return -ENOTSUP;
         |                 ^~~~~~~
         |                 ENOTSUPP
   kernel/bpf/syscall.c:3021:17: note: each undeclared identifier is reported only once for each function it appears in
   kernel/bpf/syscall.c: In function 'kretprobe_dispatcher':
   kernel/bpf/syscall.c:3099:32: error: implicit declaration of function 'get_kretprobe'; did you mean 'get_kprobe'? [-Werror=implicit-function-declaration]
    3099 |         struct kretprobe *rp = get_kretprobe(ri);
         |                                ^~~~~~~~~~~~~
         |                                get_kprobe
>> kernel/bpf/syscall.c:3099:32: warning: initialization of 'struct kretprobe *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
   kernel/bpf/syscall.c: In function 'bpf_perf_link_attach':
   kernel/bpf/syscall.c:3022:1: error: control reaches end of non-void function [-Werror=return-type]
    3022 | }
         | ^
   cc1: some warnings being treated as errors


vim +3099 kernel/bpf/syscall.c

  3095	
  3096	static int
  3097	kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
  3098	{
> 3099		struct kretprobe *rp = get_kretprobe(ri);
  3100		struct bpf_kprobe_link *kprobe_link;
  3101	
  3102		kprobe_link = container_of(rp, struct bpf_kprobe_link, rp);
  3103		return kprobe_link_prog_run(kprobe_link, regs);
  3104	}
  3105	

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