Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel...

[pandora-kernel.git] / Documentation / spinlocks.txt

diff --git a/Documentation/spinlocks.txt b/Documentation/spinlocks.txt
index 471e753..619699d 100644 (file)
--- 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.