X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=mm%2Fmmap.c;h=7a0707a480479f1837cc6537182300bd6d94d51f;hb=521f3970853a4b2ff7f833763532bdba2ea11257;hp=ca9d91bca0d6c61983707f23641507dee0540af2;hpb=539294b76af8922297702a7ebb8cafe68f7e5376;p=cascardo%2Flinux.git

diff --git a/mm/mmap.c b/mm/mmap.c
index ca9d91bca0d6..7a0707a48047 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -88,6 +88,11 @@ static void unmap_region(struct mm_struct *mm,
  *		w: (no) no	w: (no) no	w: (copy) copy	w: (no) no
  *		x: (no) no	x: (no) yes	x: (no) yes	x: (yes) yes
  *
+ * On arm64, PROT_EXEC has the following behaviour for both MAP_SHARED and
+ * MAP_PRIVATE:
+ *								r: (no) no
+ *								w: (no) no
+ *								x: (yes) yes
  */
 pgprot_t protection_map[16] = {
 	__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
@@ -3063,6 +3068,14 @@ out:
 	return ERR_PTR(ret);
 }
 
+bool vma_is_special_mapping(const struct vm_area_struct *vma,
+	const struct vm_special_mapping *sm)
+{
+	return vma->vm_private_data == sm &&
+		(vma->vm_ops == &special_mapping_vmops ||
+		 vma->vm_ops == &legacy_special_mapping_vmops);
+}
+
 /*
  * Called with mm->mmap_sem held for writing.
  * Insert a new vma covering the given region, with the given flags.