fix compile with VM_RADIX

ae848a95 · Nickolai Zeldovich · 6ac05a42 · ae848a95
--- a/kernel/vm.cc
+++ b/kernel/vm.cc
@@ -731,11 +731,28 @@ vmap::unmapped_area(size_t npages)
  uptr addr = 0x1000;
  while (addr < USERTOP) {
+#if VM_CRANGE
    auto x = cr.search(addr, n);
    if (x == nullptr)
      return addr;
    vma* a = (vma*) x;
    addr = a->vma_end;
+#endif
+#if VM_RADIX
+    bool overlap = false;
+    for (uptr ax = addr; ax < addr+n; ax += PGSIZE) {
+      auto x = rx.search(ax);
+      if (x != nullptr) {
+        overlap = true;
+        vma* a = (vma*) x;
+        addr = a->vma_end;
+        break;
+      }
+    }
+    if (!overlap)
+      return addr;
+#endif
  }
  return 0;
 }