[PATCH] xip: madvice/fadvice: execute in place

Make sys_madvice/fadvice return sane with xip.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/fadvise.c

@@ -43,6 +43,10 @@ asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
 		goto out;
 	}
 
+	if (mapping->a_ops->get_xip_page)
+		/* no bad return value, but ignore advice */
+		goto out;
+
 	/* Careful about overflows. Len == 0 means "as much as possible" */
 	endbyte = offset + len;
 	if (!len || endbyte < len)

mm/madvise.c

@@ -86,6 +86,11 @@ static long madvise_willneed(struct vm_area_struct * vma,
 	if (!file)
 		return -EBADF;
 
+	if (file->f_mapping->a_ops->get_xip_page) {
+		/* no bad return value, but ignore advice */
+		return 0;
+	}
+
 	*prev = vma;
 	start = ((start - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
 	if (end > vma->vm_end)