[PATCH] mm: ia64 use expand_upwards

ia64 has expand_backing_store function for growing its Register Backing Store
vma upwards.  But more complete code for this purpose is found in the
CONFIG_STACK_GROWSUP part of mm/mmap.c.  Uglify its #ifdefs further to provide
expand_upwards for ia64 as well as expand_stack for parisc.

The Register Backing Store vma should be marked VM_ACCOUNT.  Implement the
intention of growing it only a page at a time, instead of passing an address
outside of the vma to handle_mm_fault, with unknown consequences.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 98246acd499..0063b2c5090 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -158,7 +158,7 @@ ia64_init_addr_space (void)
                 vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
                 vma->vm_end = vma->vm_start + PAGE_SIZE;
                 vma->vm_page_prot = protection_map[VM_DATA_DEFAULT_FLAGS & 0x7];
-                vma->vm_flags = VM_DATA_DEFAULT_FLAGS | VM_GROWSUP;
+                vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT;
                 down_write(&current->mm->mmap_sem);
                 if (insert_vm_struct(current->mm, vma)) {
                         up_write(&current->mm->mmap_sem);