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authorMichael Ellerman <michael@ellerman.id.au>2007-05-08 00:30:22 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:11 -0700
commitd1ab824be43842ae7429ab1df37153e1cebb4d32 (patch)
tree346280ad807fa3b60f18861dac7a7da307568695 /include
parentb5e618181a927210f8be1d3d2249d31904ba358d (diff)
Document SPIN_LOCK_UNLOCKED/RW_LOCK_UNLOCKED deprecation
Apparently it's not cool anymore to use SPIN/RW_LOCK_UNLOCKED. There's some mention of this in Documentation/spinlocks.txt, but that only talks about dynamic initialisation. A comment in the code mentioning the preferred usage would be good IMHO. [akpm@linux-foundation.org: add reason for deprecation] Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/spinlock_types.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h
index dc5fb69e4de9..210549ba4ef4 100644
--- a/include/linux/spinlock_types.h
+++ b/include/linux/spinlock_types.h
@@ -85,6 +85,12 @@ typedef struct {
RW_DEP_MAP_INIT(lockname) }
#endif
+/*
+ * SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and
+ * are hence deprecated.
+ * Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
+ * __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate.
+ */
#define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(old_style_spin_init)
#define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init)