I will need one to lookup for userfaultfd_wait_queue-s in different
wait queue.
Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
---
fs/userfaultfd.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index c89e96f..c593a72 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -433,23 +433,29 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
}
/* fault_pending_wqh.lock must be hold by the caller */
-static inline struct userfaultfd_wait_queue *find_userfault(
- struct userfaultfd_ctx *ctx)
+static inline struct userfaultfd_wait_queue *find_userfault_in(
+ wait_queue_head_t *wqh)
{
wait_queue_t *wq;
struct userfaultfd_wait_queue *uwq;
- VM_BUG_ON(!spin_is_locked(&ctx->fault_pending_wqh.lock));
+ VM_BUG_ON(!spin_is_locked(&wqh->lock));
uwq = NULL;
- if (!waitqueue_active(&ctx->fault_pending_wqh))
+ if (!waitqueue_active(wqh))
goto out;
/* walk in reverse to provide FIFO behavior to read userfaults */
- wq = list_last_entry(&ctx->fault_pending_wqh.task_list,
- typeof(*wq), task_list);
+ wq = list_last_entry(&wqh->task_list, typeof(*wq), task_list);
uwq = container_of(wq, struct userfaultfd_wait_queue, wq);
out:
return uwq;
+
+}
+
+static inline struct userfaultfd_wait_queue *find_userfault(
+ struct userfaultfd_ctx *ctx)
+{
+ return find_userfault_in(&ctx->fault_pending_wqh);
}
static unsigned int userfaultfd_poll(struct file *file, poll_table *wait)
--
1.9.3
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