vm: Fix heap preallocation.

Change-Id: I5b7f6473b9bbff69eae6ab26c889ad8ed902ff3a

diff --git a/minix/servers/vm/rs.c b/minix/servers/vm/rs.c
index cde9f89d9733fc2bee45e4e191a1b2e22745f243..38d56bd25af133aa9ecc76d1a0bb3393e0d9beb4 100644 (file)
--- a/minix/servers/vm/rs.c
+++ b/minix/servers/vm/rs.c
@@ -198,12 +198,17 @@ static int rs_memctl_make_vm_instance(struct vmproc *new_vm_vmp)
 static int rs_memctl_heap_prealloc(struct vmproc *vmp,
        vir_bytes *addr, size_t *len)
 {
+       struct vir_region *data_vr;
+       vir_bytes bytes;
 
-       /*
-        * XXX: Is this still needed?
-        */
+       if(*len <= 0) {
+               return EINVAL;
+       }
+       data_vr = region_search(&vmp->vm_regions_avl, VM_MMAPBASE, AVL_LESS);
+       *addr = data_vr->vaddr + data_vr->length;
+       bytes = *addr + *len;
 
-       return OK;
+       return real_brk(vmp, bytes);
 }
 
 /*===========================================================================*