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| author | Luck, Tony <tony.luck@intel.com> | 2010-08-24 11:44:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-24 12:13:20 -0700 |
| commit | 8ca3eb08097f6839b2206e2242db4179aee3cfb3 (patch) | |
| tree | 32b9f033230d615d248fa0bbfa1a0c644a422ed8 /include | |
| parent | 9559fcdbff4f93d29af04478bbc48294519424f5 (diff) | |
| download | linux-8ca3eb08097f6839b2206e2242db4179aee3cfb3.tar.gz linux-8ca3eb08097f6839b2206e2242db4179aee3cfb3.tar.bz2 linux-8ca3eb08097f6839b2206e2242db4179aee3cfb3.zip | |
guard page for stacks that grow upwards
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 709f6728fc90..831c693416b2 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -78,7 +78,11 @@ extern unsigned int kobjsize(const void *objp); #define VM_MAYSHARE 0x00000080 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ +#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64) #define VM_GROWSUP 0x00000200 +#else +#define VM_GROWSUP 0x00000000 +#endif #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ @@ -1330,8 +1334,10 @@ unsigned long ra_submit(struct file_ra_state *ra, /* Do stack extension */ extern int expand_stack(struct vm_area_struct *vma, unsigned long address); -#ifdef CONFIG_IA64 +#if VM_GROWSUP extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); +#else + #define expand_upwards(vma, address) do { } while (0) #endif extern int expand_stack_downwards(struct vm_area_struct *vma, unsigned long address); |