crc/test: fix potential div by zero

[fio.git] / lib / lfsr.c

diff --git a/lib/lfsr.c b/lib/lfsr.c
index 927b2a10cdeeefc4441a9b7aa720677b6939a9be..329ef85a8bf7a4e9529838c201482ee0eab78641 100644 (file)
--- a/lib/lfsr.c
+++ b/lib/lfsr.c
@@ -2,6 +2,7 @@
 #include <math.h>
 
 #include "lfsr.h"
+#include "../compiler/compiler.h"
 
 /*
  * LFSR taps retrieved from:
@@ -132,11 +133,9 @@ int lfsr_next(struct fio_lfsr *fl, uint64_t *off, uint64_t last)
                if (fl->cycle_length && !--fl->cycle_length) {
                        __lfsr_next(fl, fl->spin + 1);
                        fl->cycle_length = fl->cached_cycle_length;
-                       goto check;
-               }
-               __lfsr_next(fl, fl->spin);
-check: ;
-       } while (fl->last_val > fl->max_val);
+               } else
+                       __lfsr_next(fl, fl->spin);
+       } while (fio_unlikely(fl->last_val > fl->max_val));
 
        *off = fl->last_val;
        return 0;
@@ -187,7 +186,7 @@ static uint8_t *find_lfsr(uint64_t size)
  * Thus, [1] is equivalent to (y * i) % (spin + 1) == 0;
  * Also, the cycle's length will be (x * i) + (y * i) / (spin + 1)
  */
-int prepare_spin(struct fio_lfsr *fl, unsigned int spin)
+static int prepare_spin(struct fio_lfsr *fl, unsigned int spin)
 {
        uint64_t max = (fl->cached_bit << 1) - 1;
        uint64_t x, y;