[PATCH v4 1/5] mm/page_reporting: add PAGE_REPORTING_ORDER_UNSPECIFIED
From: Yuvraj Sakshith
Date: Tue Mar 03 2026 - 06:45:42 EST
Drivers can pass order of pages to be reported while
registering itself. Today, this is a magic number, 0.
Label this with PAGE_REPORTING_ORDER_UNSPECIFIED and
check for it when the driver is being registered.
This macro will be used in relevant drivers next.
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..d1886c657 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_ORDER_UNSPECIFIED 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..a97ee07cb 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_ORDER_UNSPECIFIED &&
+ prdev->order <= MAX_PAGE_ORDER)
page_reporting_order = prdev->order;
else
page_reporting_order = pageblock_order;
--
2.34.1