Don't truncate the LFSR to 32 bits

This caused it to collapse to 0, preventing coherence_torture from doing
anything interesting at all...

1 files changed, 2 insertions, 2 deletions

diff --git a/v/vm.c b/v/vm.c
index 8fd9811..df302b4 100644
--- a/v/vm.c
+++ b/v/vm.c
@@ -210,7 +210,7 @@ void handle_trap(trapframe_t* tf)
 static void coherence_torture()
 {
   // cause coherence misses without affecting program semantics
-  unsigned int random = ENTROPY;
+  uint64_t random = ENTROPY;
   while (1) {
     uintptr_t paddr = DRAM_BASE + ((random % (2 * (MAX_TEST_PAGES + 1) * PGSIZE)) & -4);
 #ifdef __riscv_atomic
@@ -225,7 +225,7 @@ static void coherence_torture()
 
 void vm_boot(uintptr_t test_addr)
 {
-  unsigned int random = ENTROPY;
+  uint64_t random = ENTROPY;
   if (read_csr(mhartid) > 0)
     coherence_torture();