Re: [PATCH v1 7/9] fuse: add io-uring kernel-managed buffer ring

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

Hi Joanne,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mszeredi-fuse/for-next]
[also build test WARNING on linus/master v7.0-rc5 next-20260327]
[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/Joanne-Koong/fuse-separate-next-request-fetching-from-sending-logic/20260328-142620
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next
patch link:    https://lore.kernel.org/r/20260324224532.3733468-8-joannelkoong%40gmail.com
patch subject: [PATCH v1 7/9] fuse: add io-uring kernel-managed buffer ring
config: powerpc64-randconfig-002-20260328 (https://download.01.org/0day-ci/archive/20260328/202603282121.RW1CxOjh-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260328/202603282121.RW1CxOjh-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/202603282121.RW1CxOjh-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/fuse/dev_uring.c:8:
   fs/fuse/dev_uring_i.h:63:37: error: field 'payload_kvec' has incomplete type
      63 |                         struct kvec payload_kvec;
         |                                     ^~~~~~~~~~~~
   fs/fuse/dev_uring.c: In function 'fuse_uring_get_buf_ring_headers':
   fs/fuse/dev_uring.c:296:24: error: implicit declaration of function 'io_uring_registered_mem_region_get' [-Werror=implicit-function-declaration]
     296 |         mem_reg_addr = io_uring_registered_mem_region_get(cmd, &nr_pages,
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> fs/fuse/dev_uring.c:296:22: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     296 |         mem_reg_addr = io_uring_registered_mem_region_get(cmd, &nr_pages,
         |                      ^
   fs/fuse/dev_uring.c: In function 'fuse_uring_buf_ring_setup':
   fs/fuse/dev_uring.c:334:15: error: implicit declaration of function 'io_uring_buf_ring_pin'; did you mean 'fuse_uring_buf_ring_setup'? [-Werror=implicit-function-declaration]
     334 |         err = io_uring_buf_ring_pin(cmd, FUSE_URING_BUFRING_GROUP, issue_flags,
         |               ^~~~~~~~~~~~~~~~~~~~~
         |               fuse_uring_buf_ring_setup
   fs/fuse/dev_uring.c:339:14: error: implicit declaration of function 'io_uring_is_kmbuf_ring' [-Werror=implicit-function-declaration]
     339 |         if (!io_uring_is_kmbuf_ring(cmd, FUSE_URING_BUFRING_GROUP, issue_flags))
         |              ^~~~~~~~~~~~~~~~~~~~~~
   fs/fuse/dev_uring.c:349:9: error: implicit declaration of function 'io_uring_buf_ring_unpin'; did you mean 'fuse_uring_buf_ring_setup'? [-Werror=implicit-function-declaration]
     349 |         io_uring_buf_ring_unpin(cmd, FUSE_URING_BUFRING_GROUP, issue_flags);
         |         ^~~~~~~~~~~~~~~~~~~~~~~
         |         fuse_uring_buf_ring_setup
   fs/fuse/dev_uring.c: In function 'fuse_uring_select_buffer':
   fs/fuse/dev_uring.c:903:15: error: implicit declaration of function 'io_ring_buffer_select'; did you mean 'io_uring_cmd_buffer_select'? [-Werror=implicit-function-declaration]
     903 |         sel = io_ring_buffer_select(cmd_to_io_kiocb(ent->cmd), &len,
         |               ^~~~~~~~~~~~~~~~~~~~~
         |               io_uring_cmd_buffer_select
   fs/fuse/dev_uring.c:903:15: error: incompatible types when assigning to type 'struct io_br_sel' from type 'int'
   fs/fuse/dev_uring.c:907:18: error: 'struct io_br_sel' has no member named 'kaddr'; did you mean 'addr'?
     907 |         if (!sel.kaddr)
         |                  ^~~~~
         |                  addr
   fs/fuse/dev_uring.c:910:42: error: 'struct io_br_sel' has no member named 'kaddr'; did you mean 'addr'?
     910 |         ent->payload_kvec.iov_base = sel.kaddr;
         |                                          ^~~~~
         |                                          addr
   fs/fuse/dev_uring.c:912:27: error: 'struct io_br_sel' has no member named 'buf_id'; did you mean 'buf_list'?
     912 |         ent->buf_id = sel.buf_id;
         |                           ^~~~~~
         |                           buf_list
   In file included from arch/powerpc/include/asm/bug.h:116,
                    from include/linux/bug.h:5,
                    from include/linux/instrumented.h:10,
                    from include/asm-generic/bitops/instrumented-atomic.h:14,
                    from arch/powerpc/include/asm/bitops.h:321,
                    from include/linux/bitops.h:67,
                    from include/linux/bitmap.h:8,
                    from include/linux/nodemask.h:91,
                    from include/linux/list_lru.h:12,
                    from include/linux/fs/super_types.h:7,
                    from include/linux/fs/super.h:5,
                    from include/linux/fs.h:5,
                    from fs/fuse/fuse_i.h:17,
                    from fs/fuse/dev_uring.c:7:
   fs/fuse/dev_uring.c: In function 'fuse_uring_recycle_buffer':
   fs/fuse/dev_uring.c:928:22: error: implicit declaration of function 'io_uring_kmbuf_recycle' [-Werror=implicit-function-declaration]
     928 |         WARN_ON_ONCE(io_uring_kmbuf_recycle(ent->cmd, FUSE_URING_BUFRING_GROUP,
         |                      ^~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
     120 |         int __ret_warn_on = !!(condition);                              \
         |                                ^~~~~~~~~
   cc1: some warnings being treated as errors


vim +296 fs/fuse/dev_uring.c

   285	
   286	static void *fuse_uring_get_buf_ring_headers(struct io_uring_cmd *cmd,
   287						     u64 headers_offset,
   288						     unsigned int queue_depth,
   289						     unsigned int issue_flags)
   290	{
   291		void *mem_reg_addr;
   292		u64 mem_reg_size, headers_size;
   293		unsigned nr_pages;
   294	
   295		/* find the headers in the registered memory region */
 > 296		mem_reg_addr = io_uring_registered_mem_region_get(cmd, &nr_pages,
   297								  issue_flags);
   298	
   299		/* server does not have a registered memory region set up */
   300		if (!mem_reg_addr)
   301			return NULL;
   302	
   303		mem_reg_size = (u64)nr_pages * PAGE_SIZE;
   304		if (headers_offset > mem_reg_size)
   305			return NULL;
   306	
   307		/* verify headers fit within memory region bounds */
   308		headers_size = (u64)queue_depth * sizeof(struct fuse_uring_req_header);
   309		if (mem_reg_size - headers_offset < headers_size)
   310			return NULL;
   311	
   312		return mem_reg_addr + headers_offset;
   313	}
   314	

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