mirror of
https://github.com/torvalds/linux
synced 2024-07-21 10:41:44 +00:00
fa780334a8
If io_uring.o is built with W=1, it triggers a warning:
io_uring/io_uring.c: In function ‘__io_submit_flush_completions’:
io_uring/io_uring.c:1502:40: warning: variable ‘prev’ set but not used [-Wunused-but-set-variable]
1502 | struct io_wq_work_node *node, *prev;
| ^~~~
which is due to the wq_list_for_each() iterator always keeping a 'prev'
variable. Most users need this to remove an entry from a list, for
example, but __io_submit_flush_completions() never does that.
Add a basic helper that doesn't track prev instead, and use that in
that function.
Reported-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
#ifndef INTERNAL_IO_SLIST_H
|
|
#define INTERNAL_IO_SLIST_H
|
|
|
|
#include <linux/io_uring_types.h>
|
|
|
|
#define __wq_list_for_each(pos, head) \
|
|
for (pos = (head)->first; pos; pos = (pos)->next)
|
|
|
|
#define wq_list_for_each(pos, prv, head) \
|
|
for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
|
|
|
|
#define wq_list_for_each_resume(pos, prv) \
|
|
for (; pos; prv = pos, pos = (pos)->next)
|
|
|
|
#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
|
|
|
|
#define INIT_WQ_LIST(list) do { \
|
|
(list)->first = NULL; \
|
|
} while (0)
|
|
|
|
static inline void wq_list_add_after(struct io_wq_work_node *node,
|
|
struct io_wq_work_node *pos,
|
|
struct io_wq_work_list *list)
|
|
{
|
|
struct io_wq_work_node *next = pos->next;
|
|
|
|
pos->next = node;
|
|
node->next = next;
|
|
if (!next)
|
|
list->last = node;
|
|
}
|
|
|
|
static inline void wq_list_add_tail(struct io_wq_work_node *node,
|
|
struct io_wq_work_list *list)
|
|
{
|
|
node->next = NULL;
|
|
if (!list->first) {
|
|
list->last = node;
|
|
WRITE_ONCE(list->first, node);
|
|
} else {
|
|
list->last->next = node;
|
|
list->last = node;
|
|
}
|
|
}
|
|
|
|
static inline void wq_list_add_head(struct io_wq_work_node *node,
|
|
struct io_wq_work_list *list)
|
|
{
|
|
node->next = list->first;
|
|
if (!node->next)
|
|
list->last = node;
|
|
WRITE_ONCE(list->first, node);
|
|
}
|
|
|
|
static inline void wq_list_cut(struct io_wq_work_list *list,
|
|
struct io_wq_work_node *last,
|
|
struct io_wq_work_node *prev)
|
|
{
|
|
/* first in the list, if prev==NULL */
|
|
if (!prev)
|
|
WRITE_ONCE(list->first, last->next);
|
|
else
|
|
prev->next = last->next;
|
|
|
|
if (last == list->last)
|
|
list->last = prev;
|
|
last->next = NULL;
|
|
}
|
|
|
|
static inline void __wq_list_splice(struct io_wq_work_list *list,
|
|
struct io_wq_work_node *to)
|
|
{
|
|
list->last->next = to->next;
|
|
to->next = list->first;
|
|
INIT_WQ_LIST(list);
|
|
}
|
|
|
|
static inline bool wq_list_splice(struct io_wq_work_list *list,
|
|
struct io_wq_work_node *to)
|
|
{
|
|
if (!wq_list_empty(list)) {
|
|
__wq_list_splice(list, to);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static inline void wq_stack_add_head(struct io_wq_work_node *node,
|
|
struct io_wq_work_node *stack)
|
|
{
|
|
node->next = stack->next;
|
|
stack->next = node;
|
|
}
|
|
|
|
static inline void wq_list_del(struct io_wq_work_list *list,
|
|
struct io_wq_work_node *node,
|
|
struct io_wq_work_node *prev)
|
|
{
|
|
wq_list_cut(list, node, prev);
|
|
}
|
|
|
|
static inline
|
|
struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
|
|
{
|
|
struct io_wq_work_node *node = stack->next;
|
|
|
|
stack->next = node->next;
|
|
return node;
|
|
}
|
|
|
|
static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
|
|
{
|
|
if (!work->list.next)
|
|
return NULL;
|
|
|
|
return container_of(work->list.next, struct io_wq_work, list);
|
|
}
|
|
|
|
#endif // INTERNAL_IO_SLIST_H
|