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Subjectfs/io_uring.c:9355:9: warning: variable 'ret' is uninitialized when used here
tree:   https://github.com/intel-lab-lkp/linux/commits/UPDATE-20220716-232000/Usama-Arif/io_uring-remove-ring-quiesce-in-io_uring_register/20220204-225343
head: a5e1e37e8b4c9ca3f59d11e31910a7f093649d31
commit: 5c6ec2f45e82c1351622414a938ca16473523b5b io_uring: avoid ring quiesce while registering/unregistering eventfd
date: 8 hours ago
config: hexagon-randconfig-r031-20220717 (https://download.01.org/0day-ci/archive/20220717/202207170736.NYpEy72b-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 07022e6cf9b5b3baa642be53d0b3c3f1c403dbfd)
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://github.com/intel-lab-lkp/linux/commit/5c6ec2f45e82c1351622414a938ca16473523b5b
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review UPDATE-20220716-232000/Usama-Arif/io_uring-remove-ring-quiesce-in-io_uring_register/20220204-225343
git checkout 5c6ec2f45e82c1351622414a938ca16473523b5b
# 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=hexagon SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> fs/io_uring.c:9355:9: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
return ret;
^~~
fs/io_uring.c:9334:13: note: initialize the variable 'ret' to silence this warning
int fd, ret;
^
= 0
fs/io_uring.c:1200:20: warning: unused function 'req_ref_put' [-Wunused-function]
static inline void req_ref_put(struct io_kiocb *req)
^
2 warnings generated.


vim +/ret +9355 fs/io_uring.c

9329
9330 static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg)
9331 {
9332 struct io_ev_fd *ev_fd;
9333 __s32 __user *fds = arg;
9334 int fd, ret;
9335
9336 ev_fd = rcu_dereference_protected(ctx->io_ev_fd, lockdep_is_held(&ctx->uring_lock));
9337 if (ev_fd)
9338 return -EBUSY;
9339
9340 if (copy_from_user(&fd, fds, sizeof(*fds)))
9341 return -EFAULT;
9342
9343 ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL);
9344 if (!ev_fd)
9345 return -ENOMEM;
9346
9347 ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd);
9348 if (IS_ERR(ev_fd->cq_ev_fd)) {
9349 ret = PTR_ERR(ev_fd->cq_ev_fd);
9350 kfree(ev_fd);
9351 return ret;
9352 }
9353
9354 rcu_assign_pointer(ctx->io_ev_fd, ev_fd);
> 9355 return ret;
9356 }
9357

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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