[AGPGART] remove private page protection map

AGP keeps its own copy of the protection_map, upcoming DRM changes will
also require access to this map from modules.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index c1868ecdbc5f..c7ed061f4507 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -60,6 +60,13 @@ pgprot_t protection_map[16] = {
         __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
 };
 
+pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+        return protection_map[vm_flags &
+                                (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+}
+EXPORT_SYMBOL(vm_get_page_prot);
+
 int sysctl_overcommit_memory = OVERCOMMIT_GUESS;  /* heuristic overcommit */
 int sysctl_overcommit_ratio = 50;       /* default is 50% */
 int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;