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Subject[PATCH 2/6] xfs: simplify xfs_ail_max() via list_last_entry_or_null()
From: Jie Liu <jeff.liu@oracle.com>

Simplify xfs_ail_max() with list_last_entry_or_null(), and move it to
xfs_trans_priv.h as an inline function as now it is one line.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
---
fs/xfs/xfs_trans_ail.c | 14 --------------
fs/xfs/xfs_trans_priv.h | 12 ++++++++++++
2 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index a728735..af605d0 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -62,20 +62,6 @@ xfs_ail_check(
#endif /* DEBUG */

/*
- * Return a pointer to the last item in the AIL. If the AIL is empty, then
- * return NULL.
- */
-static xfs_log_item_t *
-xfs_ail_max(
- struct xfs_ail *ailp)
-{
- if (list_empty(&ailp->xa_ail))
- return NULL;
-
- return list_entry(ailp->xa_ail.prev, xfs_log_item_t, li_ail);
-}
-
-/*
* Return a pointer to the item which follows the given item in the AIL. If
* the given item is the last item in the list, then return NULL.
*/
diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
index 12e86af..b1d93ae 100644
--- a/fs/xfs/xfs_trans_priv.h
+++ b/fs/xfs/xfs_trans_priv.h
@@ -97,6 +97,18 @@ xfs_ail_min(
li_ail);
}

+/*
+ * Return a pointer to the last item in the AIL. If the AIL is empty, then
+ * return NULL.
+ */
+static inline struct xfs_log_item *
+xfs_ail_max(
+ struct xfs_ail *ailp)
+{
+ return list_last_entry_or_null(&ailp->xa_ail, struct xfs_log_item,
+ li_ail);
+}
+
static inline void
xfs_trans_ail_update(
struct xfs_ail *ailp,
--
1.8.3.2

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