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guard page for stacks that grow upwards

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pa-risc and ia64 have stacks that grow upwards. Check that
they do not run into other mappings. By making VM_GROWSUP
0x0 on architectures that do not ever use it, we can avoid
some unpleasant #ifdefs in check_stack_guard_page().

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luck, Tony
2010-08-24 11:44:18 -07:00
committed by Linus Torvalds
parent 9559fcdbff
commit 8ca3eb0809
3 changed files with 18 additions and 8 deletions
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3
mm/mmap.c
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@@ -1716,9 +1716,6 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
* PA-RISC uses this for its stack; IA64 for its Register Backing Store.
* vma is the last one with address > vma->vm_end. Have to extend vma.
*/
#ifndef CONFIG_IA64
static
#endif
int expand_upwards(struct vm_area_struct *vma, unsigned long address)
{
int error;