[PATCH] s390: Use get_tod_clock_fast() for random_get_entropy()

[Heiko Carstens]

Use get_tod_clock_fast() instead of get_tod_clock_monotonic() to implement
random_get_entropy().

There is no need for random_get_entropy() to provide monotonic increasing
values, nor is there any need to provide (close to) nanosecond granularity
timestamps by shifting the result.

This slightly reduces the execution time of random_get_entropy() and adds
two bits of randomness.

Signed-off-by: Heiko Carstens <hca at linux.ibm.com>
---
 arch/s390/include/asm/random.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/random.h b/arch/s390/include/asm/random.h
index 7daf42dbed32..f6d9312efdbf 100644
--- a/arch/s390/include/asm/random.h
+++ b/arch/s390/include/asm/random.h
@@ -6,7 +6,7 @@
 
 static inline unsigned long random_get_entropy(void)
 {
-	return (unsigned long)get_tod_clock_monotonic() >> 2;
+	return get_tod_clock_fast();
 }
 
 #endif
-- 
2.51.0