mm: add a basic debugging framework for memory initialisation

[sfrench/cifs-2.6.git] / mm / internal.h

diff --git a/mm/internal.h b/mm/internal.h
index 0034e947e4bc677c9220c267eaaa75d5d89e7760..a7ee052532943a53eb559c5fb2b0a5323dd52574 100644 (file)
--- 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