1 files changed, 13 insertions, 9 deletions

diff --git a/crypto/jitterentropy-kcapi.c b/crypto/jitterentropy-kcapi.c
index 597cedd3531c..c4938497eedb 100644
--- a/crypto/jitterentropy-kcapi.c
+++ b/crypto/jitterentropy-kcapi.c
@@ -87,24 +87,28 @@ void jent_memcpy(void *dest, const void *src, unsigned int n)
         memcpy(dest, src, n);
 }
 
+/*
+ * Obtain a high-resolution time stamp value. The time stamp is used to measure
+ * the execution time of a given code path and its variations. Hence, the time
+ * stamp must have a sufficiently high resolution.
+ *
+ * Note, if the function returns zero because a given architecture does not
+ * implement a high-resolution time stamp, the RNG code's runtime test
+ * will detect it and will not produce output.
+ */
 void jent_get_nstime(__u64 *out)
 {
-        struct timespec ts;
         __u64 tmp = 0;
 
         tmp = random_get_entropy();
 
         /*
-         * If random_get_entropy does not return a value (which is possible on,
-         * for example, MIPS), invoke __getnstimeofday
+         * If random_get_entropy does not return a value, i.e. it is not
+         * implemented for a given architecture, use a clock source.
          * hoping that there are timers we can work with.
          */
-        if ((0 == tmp) &&
-           (0 == __getnstimeofday(&ts))) {
-                tmp = ts.tv_sec;
-                tmp = tmp << 32;
-                tmp = tmp | ts.tv_nsec;
-        }
+        if (tmp == 0)
+                tmp = ktime_get_ns();
 
         *out = tmp;
 }