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Optimizing anonymous maps brings bugs, and does not optimize much anyway.
https://sourceware.org/bugzilla/show_bug.cgi?id=19903
--- a/sysdeps/mach/hurd/mmap.c
+++ b/sysdeps/mach/hurd/mmap.c
@@ -44,29 +44,6 @@ __mmap (__ptr_t addr, size_t len, int pr
if ((mapaddr & (__vm_page_size - 1)) || (offset & (__vm_page_size - 1)))
return (__ptr_t) (long int) __hurd_fail (EINVAL);
- if ((flags & (MAP_TYPE|MAP_INHERIT)) == MAP_ANON
- && prot == (PROT_READ|PROT_WRITE)) /* cf VM_PROT_DEFAULT */
- {
- /* vm_allocate has (a little) less overhead in the kernel too. */
- err = __vm_allocate (__mach_task_self (), &mapaddr, len, mapaddr == 0);
-
- if (err == KERN_NO_SPACE)
- {
- if (flags & MAP_FIXED)
- {
- /* XXX this is not atomic as it is in unix! */
- /* The region is already allocated; deallocate it first. */
- err = __vm_deallocate (__mach_task_self (), mapaddr, len);
- if (!err)
- err = __vm_allocate (__mach_task_self (), &mapaddr, len, 0);
- }
- else if (mapaddr != 0)
- err = __vm_allocate (__mach_task_self (), &mapaddr, len, 1);
- }
-
- return err ? (__ptr_t) (long int) __hurd_fail (err) : (__ptr_t) mapaddr;
- }
-
vmprot = VM_PROT_NONE;
if (prot & PROT_READ)
vmprot |= VM_PROT_READ;
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