cputime: Bring cputime -> nsecs conversion

We already have nsecs_to_cputime(). Now we need to be able to convert
the other way around in order to fix a bug on steal time accounting.

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
diff --git a/include/asm-generic/cputime_jiffies.h b/include/asm-generic/cputime_jiffies.h
index 272ecba..d5cb78f5 100644
--- a/include/asm-generic/cputime_jiffies.h
+++ b/include/asm-generic/cputime_jiffies.h
@@ -15,8 +15,10 @@
 
 
 /*
- * Convert nanoseconds to cputime
+ * Convert nanoseconds <-> cputime
  */
+#define cputime_to_nsecs(__ct)		\
+	jiffies_to_nsecs(cputime_to_jiffies(__ct))
 #define nsecs_to_cputime64(__nsec)	\
 	jiffies64_to_cputime64(nsecs_to_jiffies64(__nsec))
 #define nsecs_to_cputime(__nsec)	\
diff --git a/include/asm-generic/cputime_nsecs.h b/include/asm-generic/cputime_nsecs.h
index 768294f..4e81760 100644
--- a/include/asm-generic/cputime_nsecs.h
+++ b/include/asm-generic/cputime_nsecs.h
@@ -44,6 +44,8 @@
 /*
  * Convert cputime <-> nanoseconds
  */
+#define cputime_to_nsecs(__ct)		\
+	(__force u64)(__ct)
 #define nsecs_to_cputime(__nsecs)	\
 	(__force cputime_t)(__nsecs)