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https://github.com/torvalds/linux
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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>
119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
#ifndef INTERNAL_IO_SLIST_H
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#define INTERNAL_IO_SLIST_H
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#include <linux/io_uring_types.h>
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#define __wq_list_for_each(pos, head) \
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for (pos = (head)->first; pos; pos = (pos)->next)
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#define wq_list_for_each(pos, prv, head) \
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for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
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#define wq_list_for_each_resume(pos, prv) \
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for (; pos; prv = pos, pos = (pos)->next)
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#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
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#define INIT_WQ_LIST(list) do { \
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(list)->first = NULL; \
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} while (0)
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static inline void wq_list_add_after(struct io_wq_work_node *node,
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struct io_wq_work_node *pos,
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struct io_wq_work_list *list)
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{
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struct io_wq_work_node *next = pos->next;
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pos->next = node;
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node->next = next;
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if (!next)
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list->last = node;
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}
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static inline void wq_list_add_tail(struct io_wq_work_node *node,
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struct io_wq_work_list *list)
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{
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node->next = NULL;
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if (!list->first) {
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list->last = node;
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WRITE_ONCE(list->first, node);
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} else {
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list->last->next = node;
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list->last = node;
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}
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}
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static inline void wq_list_add_head(struct io_wq_work_node *node,
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struct io_wq_work_list *list)
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{
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node->next = list->first;
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if (!node->next)
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list->last = node;
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WRITE_ONCE(list->first, node);
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}
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static inline void wq_list_cut(struct io_wq_work_list *list,
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struct io_wq_work_node *last,
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struct io_wq_work_node *prev)
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{
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/* first in the list, if prev==NULL */
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if (!prev)
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WRITE_ONCE(list->first, last->next);
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else
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prev->next = last->next;
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if (last == list->last)
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list->last = prev;
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last->next = NULL;
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}
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static inline void __wq_list_splice(struct io_wq_work_list *list,
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struct io_wq_work_node *to)
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{
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list->last->next = to->next;
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to->next = list->first;
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INIT_WQ_LIST(list);
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}
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static inline bool wq_list_splice(struct io_wq_work_list *list,
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struct io_wq_work_node *to)
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{
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if (!wq_list_empty(list)) {
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__wq_list_splice(list, to);
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return true;
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}
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return false;
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}
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static inline void wq_stack_add_head(struct io_wq_work_node *node,
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struct io_wq_work_node *stack)
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{
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node->next = stack->next;
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stack->next = node;
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}
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static inline void wq_list_del(struct io_wq_work_list *list,
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struct io_wq_work_node *node,
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struct io_wq_work_node *prev)
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{
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wq_list_cut(list, node, prev);
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}
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static inline
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struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
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{
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struct io_wq_work_node *node = stack->next;
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stack->next = node->next;
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return node;
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}
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static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
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{
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if (!work->list.next)
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return NULL;
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return container_of(work->list.next, struct io_wq_work, list);
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}
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#endif // INTERNAL_IO_SLIST_H
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