X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=include%2Flinux%2Fmm_types.h;h=87577d37f97b95e499986acd1f37d92abff989dc;hb=76b36fa896a2db64582690e085f36adc76604134;hp=d3ebb9d21a5334d26e85bc865d318535f5864569;hpb=92e963f50fc74041b5e9e744c330dca48e04f08d;p=linux.git

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index d3ebb9d21a53..87577d37f97b 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -566,10 +566,26 @@ static inline void clear_tlb_flush_pending(struct mm_struct *mm)
 }
 #endif
 
-struct vm_special_mapping
-{
-	const char *name;
+struct vm_fault;
+
+struct vm_special_mapping {
+	const char *name;	/* The name, e.g. "[vdso]". */
+
+	/*
+	 * If .fault is not provided, this points to a
+	 * NULL-terminated array of pages that back the special mapping.
+	 *
+	 * This must not be NULL unless .fault is provided.
+	 */
 	struct page **pages;
+
+	/*
+	 * If non-NULL, then this is called to resolve page faults
+	 * on the special mapping.  If used, .pages is not checked.
+	 */
+	int (*fault)(const struct vm_special_mapping *sm,
+		     struct vm_area_struct *vma,
+		     struct vm_fault *vmf);
 };
 
 enum tlb_flush_reason {