X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=lib%2Frand.h;h=1676cf98ed567653cded97eaf00a1beabe808b58;hb=b61a5f46da1283f4544f6ace3f19e64b1cfcc800;hp=24fac23cfec0856b409405e69a313dc7e873be33;hpb=de4096e8682a064ed9125af7ac30a3fe4021167b;p=fio.git

diff --git a/lib/rand.h b/lib/rand.h
index 24fac23c..1676cf98 100644
--- a/lib/rand.h
+++ b/lib/rand.h
@@ -2,8 +2,8 @@
 #define FIO_RAND_H
 
 #include <inttypes.h>
+#include <assert.h>
 #include "types.h"
-#include "../arch/arch.h"
 
 #define FRAND32_MAX	(-1U)
 #define FRAND64_MAX	(-1ULL)
@@ -24,10 +24,6 @@ struct frand_state {
 	};
 };
 
-struct frand64_state {
-	uint64_t s1, s2, s3, s4, s5;
-};
-
 static inline uint64_t rand_max(struct frand_state *state)
 {
 	if (state->use64)
@@ -118,15 +114,38 @@ static inline double __rand_0_1(struct frand_state *state)
 	}
 }
 
+static inline uint32_t rand32_upto(struct frand_state *state, uint32_t end)
+{
+	uint32_t r;
+
+	assert(!state->use64);
+
+	r = __rand32(&state->state32);
+	end++;
+	return (int) ((double)end * (r / (FRAND32_MAX + 1.0)));
+}
+
+static inline uint64_t rand64_upto(struct frand_state *state, uint64_t end)
+{
+	uint64_t r;
+
+	assert(state->use64);
+
+	r = __rand64(&state->state64);
+	end++;
+	return (uint64_t) ((double)end * (r / (FRAND64_MAX + 1.0)));
+}
+
 /*
  * Generate a random value between 'start' and 'end', both inclusive
  */
-static inline int rand_between(struct frand_state *state, int start, int end)
+static inline uint64_t rand_between(struct frand_state *state, uint64_t start,
+				    uint64_t end)
 {
-	uint64_t r;
-
-	r = __rand(state);
-	return start + (int) ((double)end * (r / (rand_max(state) + 1.0)));
+	if (state->use64)
+		return start + rand64_upto(state, end - start);
+	else
+		return start + rand32_upto(state, end - start);
 }
 
 extern void init_rand(struct frand_state *, bool);