在 2021/9/28 下午7:10, Pavel Begunkov 写道:
On 9/27/21 7:17 AM, Hao Xu wrote:
add a helper to merge two wq_lists, it will be useful in the next
patches.
Signed-off-by: Hao Xu <haoxu@xxxxxxxxxxxxxxxxx>
---
fs/io-wq.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/fs/io-wq.h b/fs/io-wq.h
index 8369a51b65c0..7510b05d4a86 100644
--- a/fs/io-wq.h
+++ b/fs/io-wq.h
@@ -39,6 +39,26 @@ static inline void wq_list_add_after(struct io_wq_work_node *node,
list->last = node;
}
+/**
+ * wq_list_merge - merge the second list to the first one.
+ * @list0: the first list
+ * @list1: the second list
+ * after merge, list0 contains the merged list.
+ */
+static inline void wq_list_merge(struct io_wq_work_list *list0,
+ struct io_wq_work_list *list1)
+{
+ if (!list1)
+ return;
+
+ if (!list0) {
+ list0 = list1;
It assigns a local var and returns, the assignment will be compiled
out, something is wrong
True, I've corrected it in v2.
+ return;
+ }
+ list0->last->next = list1->first;
+ list0->last = list1->last;
+}
+
static inline void wq_list_add_tail(struct io_wq_work_node *node,
struct io_wq_work_list *list)
{
