[ammarfaizi2-block:axboe/linux-block/for-next 2/27] fs/io_uring.c:9406:9: error: variable 'ret' is uninitialized when used here

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block axboe/linux-block/for-next
head:   9c63ffcf47865ad2d20e09d6d6531c4611674cf1
commit: 1a75fac9a0f920a13418c88e4deaa9aa005381f5 [2/27] io_uring: avoid ring quiesce while registering/unregistering eventfd
config: arm-randconfig-c002-20220213 (https://download.01.org/0day-ci/archive/20220214/202202140741.cSdNc5dQ-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ea071884b0cc7210b3cc5fe858f0e892a779a23b)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/ammarfaizi2/linux-block/commit/1a75fac9a0f920a13418c88e4deaa9aa005381f5
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block axboe/linux-block/for-next
        git checkout 1a75fac9a0f920a13418c88e4deaa9aa005381f5
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

Note: the ammarfaizi2-block/axboe/linux-block/for-next HEAD 9c63ffcf47865ad2d20e09d6d6531c4611674cf1 builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

>> fs/io_uring.c:9406:9: error: variable 'ret' is uninitialized when used here [-Werror,-Wuninitialized]
           return ret;
                  ^~~
   fs/io_uring.c:9384:13: note: initialize the variable 'ret' to silence this warning
           int fd, ret;
                      ^
                       = 0
   1 error generated.


vim +/ret +9406 fs/io_uring.c

  9379	
  9380	static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg)
  9381	{
  9382		struct io_ev_fd *ev_fd;
  9383		__s32 __user *fds = arg;
  9384		int fd, ret;
  9385	
  9386		ev_fd = rcu_dereference_protected(ctx->io_ev_fd,
  9387						lockdep_is_held(&ctx->uring_lock));
  9388		if (ev_fd)
  9389			return -EBUSY;
  9390	
  9391		if (copy_from_user(&fd, fds, sizeof(*fds)))
  9392			return -EFAULT;
  9393	
  9394		ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL);
  9395		if (!ev_fd)
  9396			return -ENOMEM;
  9397	
  9398		ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd);
  9399		if (IS_ERR(ev_fd->cq_ev_fd)) {
  9400			ret = PTR_ERR(ev_fd->cq_ev_fd);
  9401			kfree(ev_fd);
  9402			return ret;
  9403		}
  9404	
  9405		rcu_assign_pointer(ctx->io_ev_fd, ev_fd);
> 9406		return ret;
  9407	}
  9408	

---
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