X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=Documentation%2Fspinlocks.txt;h=471e75389778eb0583be31eed6cce9d6babf67fa;hb=017f021c7e5fe3f82ccc5cbb7b1750e66e00f527;hp=a661d684768e99c2cb9737b1e5f85925554f9235;hpb=7e7d136e9e083f04b859411248c699cbb89e418d;p=firefly-linux-kernel-4.4.55.git

diff --git a/Documentation/spinlocks.txt b/Documentation/spinlocks.txt
index a661d684768e..471e75389778 100644
--- a/Documentation/spinlocks.txt
+++ b/Documentation/spinlocks.txt
@@ -1,7 +1,12 @@
-UPDATE March 21 2005 Amit Gud <gud@eth.net>
+SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and
+are hence deprecated.
 
-Macros SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED are deprecated and will be
-removed soon. So for any new code dynamic initialization should be used:
+Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
+__SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate for static
+initialization.
+
+Dynamic initialization, when necessary, may be performed as
+demonstrated below.
 
    spinlock_t xxx_lock;
    rwlock_t xxx_rw_lock;
@@ -15,12 +20,9 @@ removed soon. So for any new code dynamic initialization should be used:
 
    module_init(xxx_init);
 
-Reasons for deprecation
-  - it hurts automatic lock validators
-  - it becomes intrusive for the realtime preemption patches
-
-Following discussion is still valid, however, with the dynamic initialization
-of spinlocks instead of static.
+The following discussion is still valid, however, with the dynamic
+initialization of spinlocks or with DEFINE_SPINLOCK, etc., used
+instead of SPIN_LOCK_UNLOCKED.
 
 -----------------------