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| author | Michael Ellerman <michael@ellerman.id.au> | 2007-05-08 00:30:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:11 -0700 |
| commit | d1ab824be43842ae7429ab1df37153e1cebb4d32 (patch) | |
| tree | 346280ad807fa3b60f18861dac7a7da307568695 /include | |
| parent | b5e618181a927210f8be1d3d2249d31904ba358d (diff) | |
| download | linux-stable-d1ab824be43842ae7429ab1df37153e1cebb4d32.tar.gz linux-stable-d1ab824be43842ae7429ab1df37153e1cebb4d32.tar.bz2 linux-stable-d1ab824be43842ae7429ab1df37153e1cebb4d32.zip | |
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.h | 6 |
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) |