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-rw-r--r--Documentation/spinlocks.txt22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/spinlocks.txt b/Documentation/spinlocks.txt
index 471e75389778..619699dde593 100644
--- a/Documentation/spinlocks.txt
+++ b/Documentation/spinlocks.txt
@@ -5,6 +5,28 @@ Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
__SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate for static
initialization.
+Most of the time, you can simply turn:
+
+ static spinlock_t xxx_lock = SPIN_LOCK_UNLOCKED;
+
+into:
+
+ static DEFINE_SPINLOCK(xxx_lock);
+
+Static structure member variables go from:
+
+ struct foo bar {
+ .lock = SPIN_LOCK_UNLOCKED;
+ };
+
+to:
+
+ struct foo bar {
+ .lock = __SPIN_LOCK_UNLOCKED(bar.lock);
+ };
+
+Declaration of static rw_locks undergo a similar transformation.
+
Dynamic initialization, when necessary, may be performed as
demonstrated below.