1 files changed, 27 insertions, 0 deletions

diff --git a/mm/internal.h b/mm/internal.h
index 0034e947e4bc..a7ee05253294 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -59,4 +59,31 @@ static inline unsigned long page_order(struct page *page)
 #define __paginginit __init
 #endif
 
+/* Memory initialisation debug and verification */
+enum mminit_level {
+        MMINIT_WARNING,
+        MMINIT_VERIFY,
+        MMINIT_TRACE
+};
+
+#ifdef CONFIG_DEBUG_MEMORY_INIT
+
+extern int mminit_loglevel;
+
+#define mminit_dprintk(level, prefix, fmt, arg...) \
+do { \
+        if (level < mminit_loglevel) { \
+                printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
+                printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
+        } \
+} while (0)
+
+#else
+
+static inline void mminit_dprintk(enum mminit_level level,
+                                const char *prefix, const char *fmt, ...)
+{
+}
+
+#endif /* CONFIG_DEBUG_MEMORY_INIT */
 #endif