The patch titled
semaphore: introduce down_try()
has been removed from the -mm tree. Its filename was
semaphore-introduce-down_try.patch
This patch was dropped because it is obsolete
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: semaphore: introduce down_try()
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
I plan on removing the much-disliked down_trylock() (with its backwards
return codes) in 2.6.27, but it's creating something of a logjam with
other patches in -mm and linux-next.
Andrew suggested introducing "down_try" as a wrapper now, to make the
transition easier.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Matthew Wilcox <matthew@xxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/semaphore.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff -puN include/linux/semaphore.h~semaphore-introduce-down_try include/linux/semaphore.h
--- a/include/linux/semaphore.h~semaphore-introduce-down_try
+++ a/include/linux/semaphore.h
@@ -48,4 +48,18 @@ extern int __must_check down_trylock(str
extern int __must_check down_timeout(struct semaphore *sem, long jiffies);
extern void up(struct semaphore *sem);
+/**
+ * down_try - try to down a semaphore, but don't block
+ * @sem: the semaphore
+ *
+ * This is equivalent to down_trylock(), but has the same return codes as
+ * spin_trylock and mutex_trylock: 1 if semaphore acquired, 0 if not.
+ *
+ * down_trylock() with its confusing return codes will be deprecated
+ * soon. It will not be missed.
+ */
+static inline int __must_check down_try(struct semaphore *sem)
+{
+ return !down_trylock(sem);
+}
#endif /* __LINUX_SEMAPHORE_H */
_
Patches currently in -mm which might be from rusty@xxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
lguest-use-cpu-capability-accessors.patch
semaphore-introduce-down_try.patch
semaphore-introduce-down_try-checkpatch-fixes.patch
undeprecate-down_trylock.patch
git-semaphore.patch
percpu-introduce-define_per_cpu_page_aligned.patch
reiser4.patch
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