Reintroduce the new write_trylock_irqsave() implementation: slightly faster,
less invasive and similar in style to the implementation of
spin_trylock_irqsave() in mainline and -mm.
Signed-off-by: Satyam Sharma <[email protected]>
Cc: Sripathi Kodi <[email protected]>
Cc: Ingo Molnar <[email protected]>
---
include/linux/spinlock.h | 7 +++++++
1 file changed, 7 insertions(+)
---
diff -ruNp a/include/linux/spinlock.h b/include/linux/spinlock.h
--- a/include/linux/spinlock.h 2007-05-11 00:25:34.000000000 +0530
+++ b/include/linux/spinlock.h 2007-05-11 00:27:35.000000000 +0530
@@ -282,6 +282,13 @@ do { \
1 : ({ local_irq_restore(flags); 0; }); \
})
+#define write_trylock_irqsave(lock, flags) \
+({ \
+ local_irq_save(flags); \
+ write_trylock(lock) ? \
+ 1 : ({ local_irq_restore(flags); 0; }); \
+})
+
/*
* Locks two spinlocks l1 and l2.
* l1_first indicates if spinlock l1 should be taken first.