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Diffstat (limited to 'arch/ia64/mm/fault.c')
-rw-r--r--arch/ia64/mm/fault.c34
1 files changed, 7 insertions, 27 deletions
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index f21b55549787..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;