Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=017f021c7e5fe3f82ccc5cbb7b1750e66e00f527
Commit: 017f021c7e5fe3f82ccc5cbb7b1750e66e00f527
Parent: 7e7d136e9e083f04b859411248c699cbb89e418d
Author: Ed L. Cashin <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 15 23:41:50 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 09:05:52 2007 -0700
docs: static initialization of spinlocks is OK
Static initialization of spinlocks is preferable to dynamic initialization
when it is practical. This patch updates documentation for consistency
with comments in spinlock_types.h.
Signed-off-by: Ed L. Cashin <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
Documentation/spinlocks.txt | 20 +++++++++++---------
1 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/Documentation/spinlocks.txt b/Documentation/spinlocks.txt
index a661d68..471e753 100644
--- a/Documentation/spinlocks.txt
+++ b/Documentation/spinlocks.txt
@@ -1,7 +1,12 @@
-UPDATE March 21 2005 Amit Gud <[EMAIL PROTECTED]>
+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.
-----------------------
-
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