Sometimes it is useful to use tick in hash calculations or backoff
randomization. get_rand_tick() can be used for these purposes.
Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Signed-off-by: Bob Picco <bob.picco@xxxxxxxxxx>
---
arch/sparc/include/asm/timer_64.h | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/arch/sparc/include/asm/timer_64.h b/arch/sparc/include/asm/timer_64.h
index 51bc3bc..aa28bb4 100644
--- a/arch/sparc/include/asm/timer_64.h
+++ b/arch/sparc/include/asm/timer_64.h
@@ -94,4 +94,19 @@ static inline unsigned long get_tick(void)
return tick;
}
+/* Quick way to get a tick value that can be used in hash calculations,
+ * random backoffs etc.
+ */
+static inline unsigned long get_rand_tick(void)
+{
+ unsigned long tick;
+
+ __asm__ __volatile__(
+ " rd %%tick, %0\n"
+ : "=r" (tick)
+ : /* No input */);
+
+ return tick;
+}
+
#endif /* _SPARC64_TIMER_H */
--
1.7.1
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