There are a few of those:

io_uring/fdinfo.c:170:16: warning: declaration shadows a local variable [-Wshadow]
  170 |                 struct file *f = io_file_from_index(&ctx->file_table, i);
      |                              ^
io_uring/fdinfo.c:53:67: note: previous declaration is here
   53 | __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
      |                                                                   ^
io_uring/cancel.c:187:25: warning: declaration shadows a local variable [-Wshadow]
  187 |                 struct io_uring_task *tctx = node->task->io_uring;
      |                                       ^
io_uring/cancel.c:166:31: note: previous declaration is here
  166 |                              struct io_uring_task *tctx,
      |                                                    ^
io_uring/register.c:371:25: warning: declaration shadows a local variable [-Wshadow]
  371 |                 struct io_uring_task *tctx = no...