[PATCH v1 1/4] page_reporting: add PAGE_REPORTING_DEFAULT_ORDER

[Yuvraj Sakshith]

Drivers can pass order of pages to be reported while
registering itself. Today, this is a magic number, 0.

Label this with PAGE_REPORTING_DEFAULT_ORDER and
check for it when the driver is being registered.

Signed-off-by: Yuvraj Sakshith <yuvraj.sakshith@xxxxxxxxxxxxxxxx>
---
 include/linux/page_reporting.h | 1 +
 mm/page_reporting.c            | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/page_reporting.h b/include/linux/page_reporting.h
index fe648dfa3..a7e3e30f2 100644
--- a/include/linux/page_reporting.h
+++ b/include/linux/page_reporting.h
@@ -7,6 +7,7 @@
 
 /* This value should always be a power of 2, see page_reporting_cycle() */
 #define PAGE_REPORTING_CAPACITY		32
+#define PAGE_REPORTING_DEFAULT_ORDER	0
 
 struct page_reporting_dev_info {
 	/* function that alters pages to make them "reported" */
diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index e4c428e61..9ad4fc3f8 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -370,7 +370,8 @@ int page_reporting_register(struct page_reporting_dev_info *prdev)
 	 */
 
 	if (page_reporting_order == -1) {
-		if (prdev->order > 0 && prdev->order <= MAX_PAGE_ORDER)
+		if (prdev->order != PAGE_REPORTING_DEFAULT_ORDER &&
+			prdev->order <= MAX_PAGE_ORDER)
 			page_reporting_order = prdev->order;
 		else
 			page_reporting_order = pageblock_order;
-- 
2.34.1