X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=lib%2Frand.c;h=3b2d67ad6e9ebc4a242b24c162f94aa667a11743;hb=0a0b49007cbce8d16c9214e7ed47a2b7cc0cc7ed;hp=06812823994d45cfe744351095af015d5858fbae;hpb=7d9fb455aadc0c0363489591775496f27f4a560a;p=fio.git

diff --git a/lib/rand.c b/lib/rand.c
index 06812823..3b2d67ad 100644
--- a/lib/rand.c
+++ b/lib/rand.c
@@ -43,20 +43,28 @@ static inline int __seed(unsigned int x, unsigned int m)
 	return (x < m) ? x + m : x;
 }
 
+static void __init_rand(struct frand_state *state, unsigned int seed)
+{
+	int cranks = 6;
+
+#define LCG(x, seed)  ((x) * 69069 ^ (seed))
+
+	state->s1 = __seed(LCG((2^31) + (2^17) + (2^7), seed), 1);
+	state->s2 = __seed(LCG(state->s1, seed), 7);
+	state->s3 = __seed(LCG(state->s2, seed), 15);
+
+	while (cranks--)
+		__rand(state);
+}
+
 void init_rand(struct frand_state *state)
 {
-#define LCG(x)  ((x) * 69069)   /* super-duper LCG */
-
-	state->s1 = __seed(LCG((2^31) + (2^17) + (2^7)), 1);
-	state->s2 = __seed(LCG(state->s1), 7);
-	state->s3 = __seed(LCG(state->s2), 15);
-
-	__rand(state);
-	__rand(state);
-	__rand(state);
-	__rand(state);
-	__rand(state);
-	__rand(state);
+	__init_rand(state, 1);
+}
+
+void init_rand_seed(struct frand_state *state, unsigned int seed)
+{
+	__init_rand(state, seed);
 }
 
 void __fill_random_buf(void *buf, unsigned int len, unsigned long seed)