linux-kernel - [PATCH 04/17] hlist_bl: Prepare for split

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Message-Id: <20210409025131.4114078-5-willy@infradead.org>
Date:   Fri,  9 Apr 2021 03:51:18 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     neilb@...e.de, peterz@...radead.org, mingo@...hat.com,
        will@...nel.org, longman@...hat.com, boqun.feng@...il.com,
        tglx@...utronix.de, bigeasy@...utronix.de
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 04/17] hlist_bl: Prepare for split_locks

Make hlist_bl_lock() and hlist_bl_unlock() variadic to help with the
transition.  Also add hlist_bl_lock_nested().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/list_bl.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index ae1b541446c9..1bfdb441c8bc 100644
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -143,12 +143,19 @@ static inline void hlist_bl_del_init(struct hlist_bl_node *n)
 	}
 }
 
-static inline void hlist_bl_lock(struct hlist_bl_head *b)
+static inline void hlist_bl_lock(struct hlist_bl_head *b, ...)
 {
 	bit_spin_lock(0, (unsigned long *)b);
 }
 
-static inline void hlist_bl_unlock(struct hlist_bl_head *b)
+static inline void hlist_bl_lock_nested(struct hlist_bl_head *b,
+		struct split_lock *sl, unsigned int subclass)
+{
+	bit_spin_lock_nested(0, (unsigned long *)b, sl, subclass);
+}
+
+static inline void hlist_bl_unlock(struct hlist_bl_head *b,
+					...)
 {
 	__bit_spin_unlock(0, (unsigned long *)b);
 }
-- 
2.30.2