[axboe:io_uring-user-acct.v2 2/2] io_uring/rsrc.c:52:46: warning: variable 'count' is uninitialized when used here

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git io_uring-user-acct.v2
head:   3db2fc5d524bb4877e39659d0180dfc0112893ac
commit: 3db2fc5d524bb4877e39659d0180dfc0112893ac [2/2] io_uring/rsrc: add huge page accounting for registered buffers
config: um-allnoconfig (https://download.01.org/0day-ci/archive/20260505/202605051516.EwH8GTl5-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260505/202605051516.EwH8GTl5-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/202605051516.EwH8GTl5-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> io_uring/rsrc.c:52:46: warning: variable 'count' is uninitialized when used here [-Wuninitialized]
      52 |         xa_store(&ctx->hpage_acct, key, xa_mk_value(count), GFP_KERNEL_ACCOUNT);
         |                                                     ^~~~~
   io_uring/rsrc.c:37:21: note: initialize the variable 'count' to silence this warning
      37 |         unsigned long count;
         |                            ^
         |                             = 0
   1 warning generated.


vim +/count +52 io_uring/rsrc.c

    29	
    30	static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx,
    31							   struct iovec *iov);
    32	
    33	static int hpage_acct_ref(struct io_ring_ctx *ctx, struct page *hpage,
    34				  bool *acct_new)
    35	{
    36		unsigned long key = (unsigned long) hpage;
    37		unsigned long count;
    38		void *entry;
    39		int ret;
    40	
    41		lockdep_assert_held(&ctx->uring_lock);
    42	
    43		entry = xa_load(&ctx->hpage_acct, key);
    44		if (entry) {
    45			*acct_new = false;
    46			return 0;
    47		}
    48	
    49		ret = xa_reserve(&ctx->hpage_acct, key, GFP_KERNEL_ACCOUNT);
    50		if (ret)
    51			return ret;
  > 52		xa_store(&ctx->hpage_acct, key, xa_mk_value(count), GFP_KERNEL_ACCOUNT);
    53		*acct_new = true;
    54		return 0;
    55	}
    56	

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