Try to force heap allocation of vmaps

3e6bc673 · Silas Boyd-Wickizer · 909c7ad2 · 3e6bc673 · 3e6bc673 · 3e6bc673
--- a/include/vm.hh
+++ b/include/vm.hh
@@ -69,13 +69,12 @@ struct vmap {
  struct radix rx;
 #endif
+  static vmap* alloc();
  atomic<u64> ref;
  pgmap *const pml4;           // Page table
  char *const kshared;
-  vmap();
-  ~vmap();
  bool replace_vma(vma *a, vma *b);
  void decref();
@@ -88,11 +87,15 @@ struct vmap {
  int copyout(uptr va, void *p, u64 len);
  int sbrk(ssize_t n, uptr *addr);
-  NEW_DELETE_OPS(vmap)
  uptr brk_;                    // Top of heap
- private:
+private:
+  vmap();
+  vmap(const vmap&);
+  vmap& operator=(const vmap&);
+  ~vmap();
+  NEW_DELETE_OPS(vmap)
  int pagefault_wcow(vma *m);
  struct spinlock brklock_;
 };
--- a/kernel/exec.cc
+++ b/kernel/exec.cc
@@ -168,7 +168,7 @@ exec(const char *path, char **argv)
  if(elf.magic != ELF_MAGIC)
    goto bad;
-  if((vmp = new vmap()) == 0)
+  if((vmp = vmap::alloc()) == 0)
    goto bad;
  // Arguments for work queue

--- a/kernel/proc.cc
+++ b/kernel/proc.cc
@@ -243,7 +243,7 @@ inituser(void)
  if (p->ftable == nullptr)
    panic("userinit: new filetable");
  bootproc = p;
-  if((p->vmap = new vmap()) == 0)
+  if((p->vmap = vmap::alloc()) == 0)
    panic("userinit: out of vmaps?");
  vmnode *vmn =  new vmnode(PGROUNDUP(_initcode_size) / PGSIZE);
  if(vmn == 0)
@@ -481,7 +481,7 @@ threadalloc(void (*fn)(void *), void *arg)
  if (p == nullptr)
    return 0;
-  p->vmap = new vmap();
+  p->vmap = vmap::alloc();
  if (p->vmap == nullptr) {
    freeproc(p);
    return 0;

--- a/kernel/vm.cc
+++ b/kernel/vm.cc
@@ -138,6 +138,12 @@ vma::~vma()
 * vmap
 */
+vmap*
+vmap::alloc(void)
+{
+  return new vmap();
+}
 vmap::vmap() :
 #if VM_CRANGE
    cr(10),