[PATCH 1/3] mm/page_reporting: Allow zero page_reporting_order

[Yuvraj Sakshith <yuvraj.sakshith@oss.qualcomm.com>]

Some drivers might require page sized chunks to be
reported. This patch allows registering a driver with
order as  zero.

Example use case: virtio-balloon driver running on a
guest with very small memory. After some time has passed,
the guest might not be able to find a chunk of 8KB.

Signed-off-by: Yuvraj Sakshith <yuvraj.sakshith@oss.qualcomm.com>
---
 mm/page_reporting.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index e4c428e61..fd7c5f0de 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -370,7 +370,7 @@ 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 >= 0 && prdev->order <= MAX_PAGE_ORDER)
 			page_reporting_order = prdev->order;
 		else
 			page_reporting_order = pageblock_order;
-- 
2.34.1