linux-kernel - [ast-bpf:skel 1/5] kernel/bpf/syscall.c:4794:56: warning: cast to pointer from integer of different size

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Date:   Thu, 3 Feb 2022 22:05:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [ast-bpf:skel 1/5] kernel/bpf/syscall.c:4794:56: warning: cast to
 pointer from integer of different size

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git skel
head:   90109bb4d0dabc315c7fa82d193d9e7a54ee18c7
commit: e20a0273d1b34b0a5f1ec45b3ad2038b465f0b54 [1/5] bpf: Extend sys_bpf commands for bpf_syscall programs.
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220203/202202031502.vruI1NMM-lkp@intel.com/config)
compiler: sh4-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/ast/bpf.git/commit/?id=e20a0273d1b34b0a5f1ec45b3ad2038b465f0b54
        git remote add ast-bpf https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git
        git fetch --no-tags ast-bpf skel
        git checkout e20a0273d1b34b0a5f1ec45b3ad2038b465f0b54
        # 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=sh 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_sys_bpf':
>> kernel/bpf/syscall.c:4794:56: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    4794 |                 attr->test.retval = bpf_prog_run(prog, (void *) attr->test.ctx_in);
         |                                                        ^


vim +4794 kernel/bpf/syscall.c

  4759	
  4760	BPF_CALL_3(bpf_sys_bpf, int, cmd, union bpf_attr *, attr, u32, attr_size)
  4761	{
  4762		struct bpf_prog *prog;
  4763	
  4764		switch (cmd) {
  4765		case BPF_MAP_CREATE:
  4766		case BPF_MAP_UPDATE_ELEM:
  4767		case BPF_MAP_FREEZE:
  4768		case BPF_PROG_LOAD:
  4769		case BPF_BTF_LOAD:
  4770		case BPF_LINK_CREATE:
  4771		case BPF_RAW_TRACEPOINT_OPEN:
  4772			break;
  4773		case BPF_PROG_TEST_RUN:
  4774			if (attr->test.data_in || attr->test.data_out ||
  4775			    attr->test.ctx_out || attr->test.duration ||
  4776			    attr->test.repeat || attr->test.flags)
  4777				return -EINVAL;
  4778	
  4779			prog = bpf_prog_get_type(attr->test.prog_fd, BPF_PROG_TYPE_SYSCALL);
  4780			if (IS_ERR(prog))
  4781				return PTR_ERR(prog);
  4782	
  4783			if (attr->test.ctx_size_in < prog->aux->max_ctx_offset ||
  4784			    attr->test.ctx_size_in > U16_MAX) {
  4785				bpf_prog_put(prog);
  4786				return -EINVAL;
  4787			}
  4788	
  4789			if (!__bpf_prog_enter_sleepable(prog)) {
  4790				/* recursion detected */
  4791				bpf_prog_put(prog);
  4792				return -EBUSY;
  4793			}
> 4794			attr->test.retval = bpf_prog_run(prog, (void *) attr->test.ctx_in);
  4795			__bpf_prog_exit_sleepable(prog, 0 /* bpf_prog_run does runtime stats */);
  4796			bpf_prog_put(prog);
  4797			return 0;
  4798		default:
  4799			return -EINVAL;
  4800		}
  4801		return __sys_bpf(cmd, KERNEL_BPFPTR(attr), attr_size);
  4802	}
  4803	EXPORT_SYMBOL(bpf_sys_bpf);
  4804	

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