manual update from upstream:

Applied Al's change 06a544971fad0992fe8b92c5647538d573089dd4
to new location of swiotlb.c

Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 7 insertions, 27 deletions

diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 3c32af910d60..af7eb087dca7 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -20,32 +20,6 @@
 extern void die (char *, struct pt_regs *, long);
 
 /*
- * This routine is analogous to expand_stack() but instead grows the
- * register backing store (which grows towards higher addresses).
- * Since the register backing store is access sequentially, we
- * disallow growing the RBS by more than a page at a time.  Note that
- * the VM_GROWSUP flag can be set on any VM area but that's fine
- * because the total process size is still limited by RLIMIT_STACK and
- * RLIMIT_AS.
- */
-static inline long
-expand_backing_store (struct vm_area_struct *vma, unsigned long address)
-{
-        unsigned long grow;
-
-        grow = PAGE_SIZE >> PAGE_SHIFT;
-        if (address - vma->vm_start > current->signal->rlim[RLIMIT_STACK].rlim_cur
-            || (((vma->vm_mm->total_vm + grow) << PAGE_SHIFT) > current->signal->rlim[RLIMIT_AS].rlim_cur))
-                return -ENOMEM;
-        vma->vm_end += PAGE_SIZE;
-        vma->vm_mm->total_vm += grow;
-        if (vma->vm_flags & VM_LOCKED)
-                vma->vm_mm->locked_vm += grow;
-        __vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file, grow);
-        return 0;
-}
-
-/*
  * Return TRUE if ADDRESS points at a page in the kernel's mapped segment
  * (inside region 5, on ia64) and that page is present.
  */
@@ -185,7 +159,13 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
                 if (REGION_NUMBER(address) != REGION_NUMBER(vma->vm_start)
                     || REGION_OFFSET(address) >= RGN_MAP_LIMIT)
                         goto bad_area;
-                if (expand_backing_store(vma, address))
+                /*
+                 * Since the register backing store is accessed sequentially,
+                 * we disallow growing it by more than a page at a time.
+                 */
+                if (address > vma->vm_end + PAGE_SIZE - sizeof(long))
+                        goto bad_area;
+                if (expand_upwards(vma, address))
                         goto bad_area;
         }
         goto good_area;