[PATCH -mm 2/2] Reintroduce write_trylock_irqsave()

[Satyam Sharma <ssatyam@cse.iitk.ac.in>]

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 <ssatyam@cse.iitk.ac.in>
Cc: Sripathi Kodi <sripathik@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>

---

 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.

-
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