diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index 2cbde865d4f5..c02deaab26c7 100644
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -521,10 +521,10 @@ static ssize_t lparcfg_write(struct file *file, const char __user * buf,
 
 	current_weight = (resource >> 5 * 8) & 0xFF;
 
-	pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
+	pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
 		 __FUNCTION__, current_entitled, current_weight);
 
-	pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
+	pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
 		 __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
 
 	retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
diff --git a/include/asm-powerpc/udbg.h b/include/asm-powerpc/udbg.h
index 5c4236c342bb..19a1517ac43b 100644
--- a/include/asm-powerpc/udbg.h
+++ b/include/asm-powerpc/udbg.h
@@ -23,7 +23,8 @@ extern int udbg_write(const char *s, int n);
 extern int udbg_read(char *buf, int buflen);
 
 extern void register_early_udbg_console(void);
-extern void udbg_printf(const char *fmt, ...);
+extern void udbg_printf(const char *fmt, ...)
+	__attribute__ ((format (printf, 1, 2)));
 extern void udbg_progress(char *s, unsigned short hex);
 
 extern void udbg_init_uart(void __iomem *comport, unsigned int speed,