linux-kernel - [PATCH 1/5] uffd: Split the find

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Date:	Wed, 13 May 2015 17:52:36 +0300
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	Sanidhya Kashyap <sanidhya.gatech@...il.com>
Subject: [PATCH 1/5] uffd: Split the find_userfault() routine

I will need one to lookup for userfaultfd_wait_queue-s in different
wait queue.

Signed-off-by: Pavel Emelyanov <xemul@...allels.com>
---
 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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