19.03.2021 16:42, Greg Kroah-Hartman пишет:

On Fri, Mar 19, 2021 at 04:39:41PM +0300, Dmitry Osipenko wrote:

quoted

19.03.2021 15:44, Dmitry Osipenko пишет:
...

quoted

quoted

 #include <linux/debugfs.h>
+#include <linux/kobject.h>
+
+struct cma_stat {
+	spinlock_t lock;
+	/* the number of CMA page successful allocations */
+	unsigned long nr_pages_succeeded;
+	/* the number of CMA page allocation failures */
+	unsigned long nr_pages_failed;
+	struct kobject kobj;
+};
 
 struct cma {
 	unsigned long   base_pfn;

@@ -16,6 +26,9 @@ struct cma {
 	struct debugfs_u32_array dfs_bitmap;
 #endif
 	char name[CMA_MAX_NAME];
+#ifdef CONFIG_CMA_SYSFS
+	struct cma_stat	*stat;
+#endif

What is the point of allocating stat dynamically?

Because static kobjects make me cry.

I meant that it's already a part of struct cma, it looks like the stat
could be embedded into struct cma and then kobj could be initialized
separately.