rcutorture: Stop right-shifting torture_random() return values

Now that torture_random() uses swahw32(), its callers no longer see
not-so-random low-order bits, as these are now swapped up into the upper
16 bits of the torture_random() function's return value.  This commit
therefore removes the right-shifting of torture_random() return values.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index d291a14..ade42d6 100644 (file)
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1877,7 +1877,7 @@ static int
 rcutorture_extend_mask(int oldmask, struct torture_random_state *trsp)
 {
        int mask = rcutorture_extend_mask_max();
-       unsigned long randmask1 = torture_random(trsp) >> 8;
+       unsigned long randmask1 = torture_random(trsp);
        unsigned long randmask2 = randmask1 >> 3;
        unsigned long preempts = RCUTORTURE_RDR_PREEMPT | RCUTORTURE_RDR_SCHED;
        unsigned long preempts_irq = preempts | RCUTORTURE_RDR_IRQ;
@@ -1936,7 +1936,7 @@ rcutorture_loop_extend(int *readstate, struct torture_random_state *trsp,
        if (!((mask - 1) & mask))
                return rtrsp;  /* Current RCU reader not extendable. */
        /* Bias towards larger numbers of loops. */
-       i = (torture_random(trsp) >> 3);
+       i = torture_random(trsp);
        i = ((i | (i >> 3)) & RCUTORTURE_RDR_MAX_LOOPS) + 1;
        for (j = 0; j < i; j++) {
                mask = rcutorture_extend_mask(*readstate, trsp);
@@ -2137,7 +2137,7 @@ static int rcu_nocb_toggle(void *arg)
                toggle_fuzz = NSEC_PER_USEC;
        do {
                r = torture_random(&rand);
-               cpu = (r >> 4) % (maxcpu + 1);
+               cpu = (r >> 1) % (maxcpu + 1);
                if (r & 0x1) {
                        rcu_nocb_cpu_offload(cpu);
                        atomic_long_inc(&n_nocb_offload);