linux-kernel - [axboe-block:for-5.20/io_uring-zerocopy-send 23/23] io_uring/notif.c:52:16: error: call to undeclared function 'io_alloc_req_refill'; ISO C99 and later do not support implicit function declarations

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Date:   Wed, 27 Jul 2022 10:46:15 +0800
From:   kernel test robot <lkp@...el.com>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: [axboe-block:for-5.20/io_uring-zerocopy-send 23/23]
 io_uring/notif.c:52:16: error: call to undeclared function
 'io_alloc_req_refill'; ISO C99 and later do not support implicit function
 declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-5.20/io_uring-zerocopy-send
head:   fbe6f6bc3210e853aab74f20da776c15c5b052fe
commit: fbe6f6bc3210e853aab74f20da776c15c5b052fe [23/23] io_uring/zc: notification completion optimisation
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220727/202207271019.xPvKdqmJ-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 83882606dbd7ffb0bdd3460356202d97705809c8)
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/axboe/linux-block.git/commit/?id=fbe6f6bc3210e853aab74f20da776c15c5b052fe
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch --no-tags axboe-block for-5.20/io_uring-zerocopy-send
        git checkout fbe6f6bc3210e853aab74f20da776c15c5b052fe
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> io_uring/notif.c:52:16: error: call to undeclared function 'io_alloc_req_refill'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (unlikely(!io_alloc_req_refill(ctx)))
                         ^
   io_uring/notif.c:52:16: note: did you mean 'io_rsrc_refs_refill'?
   io_uring/rsrc.h:57:6: note: 'io_rsrc_refs_refill' declared here
   void io_rsrc_refs_refill(struct io_ring_ctx *ctx);
        ^
>> io_uring/notif.c:54:10: error: call to undeclared function 'io_alloc_req'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           notif = io_alloc_req(ctx);
                   ^
   io_uring/notif.c:54:10: note: did you mean 'xa_alloc_irq'?
   include/linux/xarray.h:913:32: note: 'xa_alloc_irq' declared here
   static inline int __must_check xa_alloc_irq(struct xarray *xa, u32 *id,
                                  ^
>> io_uring/notif.c:54:8: error: incompatible integer to pointer conversion assigning to 'struct io_kiocb *' from 'int' [-Wint-conversion]
           notif = io_alloc_req(ctx);
                 ^ ~~~~~~~~~~~~~~~~~
   3 errors generated.


vim +/io_alloc_req_refill +52 io_uring/notif.c

    44	
    45	struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx,
    46					struct io_notif_slot *slot)
    47		__must_hold(&ctx->uring_lock)
    48	{
    49		struct io_kiocb *notif;
    50		struct io_notif_data *nd;
    51	
  > 52		if (unlikely(!io_alloc_req_refill(ctx)))
    53			return NULL;
  > 54		notif = io_alloc_req(ctx);
    55		notif->opcode = IORING_OP_NOP;
    56		notif->flags = 0;
    57		notif->file = NULL;
    58		notif->task = current;
    59		io_get_task_refs(1);
    60		notif->rsrc_node = NULL;
    61		io_req_set_rsrc_node(notif, ctx, 0);
    62		notif->cqe.user_data = slot->tag;
    63		notif->cqe.flags = slot->seq++;
    64		notif->cqe.res = 0;
    65	
    66		nd = io_notif_to_data(notif);
    67		nd->account_pages = 0;
    68		nd->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
    69		nd->uarg.callback = io_uring_tx_zerocopy_callback;
    70		/* master ref owned by io_notif_slot, will be dropped on flush */
    71		refcount_set(&nd->uarg.refcnt, 1);
    72		return notif;
    73	}
    74	

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https://01.org/lkp