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Code Issues Releases Wiki Activity

io_uring: fix warnings on shadow variables 

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 = node->task->io_uring;
      |                                       ^
io_uring/register.c:312:24: note: previous declaration is here
  312 |         struct io_uring_task *tctx = NULL;
      |                               ^

and a simple cleanup gets rid of them. For the fdinfo case, make a
distinction between the file being passed in (for the ring), and the
registered files we iterate. For the other two cases, just get rid of
shadowed variable, there's no reason to have a new one.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-03-29 17:19:45 -06:00
parent f15ed8b4d0
commit 1da2f311ba
3 changed files with 4 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
io_uring/cancel.c
View File

@ -184,9 +184,7 @@ static int __io_async_cancel(struct io_cancel_data *cd,
io_ring_submit_lock(ctx, issue_flags);
ret = -ENOENT;
list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
struct io_uring_task *tctx = node->task->io_uring;
ret = io_async_cancel_one(tctx, cd);
ret = io_async_cancel_one(node->task->io_uring, cd);
if (ret != -ENOENT) {
if (!all)
break;

4
io_uring/fdinfo.c
View File

@ -50,9 +50,9 @@ static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id,
* Caller holds a reference to the file already, we don't need to do
* anything else to get an extra reference.
*/
__cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
__cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file)
{
struct io_ring_ctx *ctx = f->private_data;
struct io_ring_ctx *ctx = file->private_data;
struct io_overflow_cqe *ocqe;
struct io_rings *r = ctx->rings;
struct rusage sq_usage;

3
io_uring/register.c
View File

@ -368,8 +368,7 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
/* now propagate the restriction to all registered users */
list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
struct io_uring_task *tctx = node->task->io_uring;
tctx = node->task->io_uring;
if (WARN_ON_ONCE(!tctx->io_wq))
continue;