Re: [PATCH 5/5] io_uring: bpf: add io_uring_bpf_req_memcpy() kfunc

[kernel test robot <lkp@intel.com>]

Hi Ming,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20251104]
[cannot apply to bpf-next/net bpf-next/master bpf/master linus/master v6.18-rc4 v6.18-rc3 v6.18-rc2 v6.18-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ming-Lei/io_uring-prepare-for-extending-io_uring-with-bpf/20251105-002757
base:   next-20251104
patch link:    https://lore.kernel.org/r/20251104162123.1086035-6-ming.lei%40redhat.com
patch subject: [PATCH 5/5] io_uring: bpf: add io_uring_bpf_req_memcpy() kfunc
config: openrisc-allyesconfig (https://download.01.org/0day-ci/archive/20251108/202511080255.v8F8GrXF-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251108/202511080255.v8F8GrXF-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511080255.v8F8GrXF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   io_uring/bpf.c: In function 'io_bpf_import_buffer':
>> io_uring/bpf.c:423:47: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     423 |                 return import_ubuf(direction, (void __user *)(addr + offset),
         |                                               ^
   In file included from include/linux/bpf_verifier.h:7,
                    from io_uring/bpf.c:9:
   io_uring/bpf.c: In function 'io_bpf_init':
   include/linux/bpf.h:2044:50: warning: statement with no effect [-Wunused-value]
    2044 | #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
         |                                                  ^~~~~~~~~~~~~~~~
   io_uring/bpf.c:551:15: note: in expansion of macro 'register_bpf_struct_ops'
     551 |         err = register_bpf_struct_ops(&bpf_uring_bpf_ops, uring_bpf_ops);
         |               ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from <command-line>:
   In function 'io_kiocb_cmd_sz_check',
       inlined from 'io_uring_bpf_prep' at io_uring/bpf.c:93:32:
   include/linux/compiler_types.h:603:45: error: call to '__compiletime_assert_598' declared with attribute error: BUILD_BUG_ON failed: cmd_sz > sizeof(struct io_cmd_data)
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:584:25: note: in definition of macro '__compiletime_assert'
     584 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:603:9: note: in expansion of macro '_compiletime_assert'
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   include/linux/io_uring_types.h:655:9: note: in expansion of macro 'BUILD_BUG_ON'
     655 |         BUILD_BUG_ON(cmd_sz > sizeof(struct io_cmd_data));
         |         ^~~~~~~~~~~~
   In function 'io_kiocb_cmd_sz_check',
       inlined from 'io_uring_bpf_issue' at io_uring/bpf.c:131:32:
   include/linux/compiler_types.h:603:45: error: call to '__compiletime_assert_598' declared with attribute error: BUILD_BUG_ON failed: cmd_sz > sizeof(struct io_cmd_data)
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:584:25: note: in definition of macro '__compiletime_assert'
     584 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:603:9: note: in expansion of macro '_compiletime_assert'
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   include/linux/io_uring_types.h:655:9: note: in expansion of macro 'BUILD_BUG_ON'
     655 |         BUILD_BUG_ON(cmd_sz > sizeof(struct io_cmd_data));
         |         ^~~~~~~~~~~~
   In function 'io_kiocb_cmd_sz_check',
       inlined from 'io_uring_bpf_fail' at io_uring/bpf.c:148:32:
   include/linux/compiler_types.h:603:45: error: call to '__compiletime_assert_598' declared with attribute error: BUILD_BUG_ON failed: cmd_sz > sizeof(struct io_cmd_data)
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:584:25: note: in definition of macro '__compiletime_assert'
     584 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:603:9: note: in expansion of macro '_compiletime_assert'
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   include/linux/io_uring_types.h:655:9: note: in expansion of macro 'BUILD_BUG_ON'
     655 |         BUILD_BUG_ON(cmd_sz > sizeof(struct io_cmd_data));
         |         ^~~~~~~~~~~~
   In function 'io_kiocb_cmd_sz_check',
       inlined from 'io_uring_bpf_cleanup' at io_uring/bpf.c:159:32:
   include/linux/compiler_types.h:603:45: error: call to '__compiletime_assert_598' declared with attribute error: BUILD_BUG_ON failed: cmd_sz > sizeof(struct io_cmd_data)
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:584:25: note: in definition of macro '__compiletime_assert'
     584 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:603:9: note: in expansion of macro '_compiletime_assert'
     603 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   include/linux/io_uring_types.h:655:9: note: in expansion of macro 'BUILD_BUG_ON'
     655 |         BUILD_BUG_ON(cmd_sz > sizeof(struct io_cmd_data));
         |         ^~~~~~~~~~~~


vim +423 io_uring/bpf.c

   401	
   402	/*
   403	 * Helper to import a buffer into an iov_iter for BPF memcpy operations.
   404	 * Handles both plain user buffers and fixed/registered buffers.
   405	 *
   406	 * @req: io_kiocb request
   407	 * @iter: output iterator
   408	 * @buf_type: buffer type (plain or fixed)
   409	 * @addr: buffer address
   410	 * @offset: offset into buffer
   411	 * @len: length from offset
   412	 * @direction: ITER_SOURCE for source buffer, ITER_DEST for destination
   413	 * @issue_flags: io_uring issue flags
   414	 *
   415	 * Returns 0 on success, negative error code on failure.
   416	 */
   417	static int io_bpf_import_buffer(struct io_kiocb *req, struct iov_iter *iter,
   418					u8 buf_type, u64 addr, unsigned int offset,
   419					u32 len, int direction, unsigned int issue_flags)
   420	{
   421		if (buf_type == IORING_BPF_BUF_TYPE_PLAIN) {
   422			/* Plain user buffer */
 > 423			return import_ubuf(direction, (void __user *)(addr + offset),
   424					   len - offset, iter);
   425		} else if (buf_type == IORING_BPF_BUF_TYPE_FIXED) {
   426			/* Fixed buffer */
   427			return io_import_reg_buf(req, iter, addr + offset,
   428						 len - offset, direction, issue_flags);
   429		}
   430	
   431		return -EINVAL;
   432	}
   433	

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