[PATCH 2/4] bug: add support for CONFIG_DEBUG_BUGVERBOSE

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

From: Ahmad Fatoum <a.fatoum@barebox.org>

This can be used to remove panic strings from barebox, when there is no
way to look at them anyway.

Also add a CONFIG_BUG symbol as it will make it easier to port kernel
code that checks for the symbol without having to patch it.

Signed-off-by: Ahmad Fatoum <a.fatoum@barebox.org>
---
 common/Kconfig            | 11 +++++++++++
 include/asm-generic/bug.h | 26 +++++++++++++++++++-------
 2 files changed, 30 insertions(+), 7 deletions(-)

diff --git a/common/Kconfig b/common/Kconfig
index 7c9b28543ffa..7442e24026e0 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -902,6 +902,17 @@ config PBL_CONSOLE
 	  must be running at the address it's linked at and bss must
 	  be cleared. On ARM that would be after setup_c().
 
+config BUG
+	def_bool y
+
+config DEBUG_BUGVERBOSE
+	bool "Verbose BUG() reporting"
+	depends on BUG
+	default y
+	help
+	  Say Y here to make WARN_ONCE() and BUG() panics output the file name
+	  and line number of the BUG/WARN call as well as the EIP and oops trace.
+
 source "common/ratp/Kconfig"
 
 config PARTITION
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 389327adfc5d..ca75b1c7646e 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -6,15 +6,27 @@
 #include <linux/compiler.h>
 #include <printf.h>
 
-#define BUG() do { \
-	printf("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __FUNCTION__); \
-	panic("BUG!"); \
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+#define __bug_printf printf
+#define __bug_panic panic
+#define __bug_dump_stack dump_stack
+#else
+#define __bug_printf no_printf
+#define __bug_panic panic_no_stacktrace
+#define __bug_dump_stack (void)0
+#endif
+
+#define BUG() do {						\
+	__bug_printf("BUG: failure at %s:%d/%s()!\n",		\
+		     __FILE__, __LINE__, __FUNCTION__);		\
+	__bug_panic("BUG!"); \
 } while (0)
 #define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
 
 
-#define __WARN() do { 								\
-	printf("WARNING: at %s:%d/%s()!\n", __FILE__, __LINE__, __FUNCTION__);	\
+#define __WARN() do { 							\
+	__bug_printf("WARNING: at %s:%d/%s()!\n",			\
+		     __FILE__, __LINE__, __FUNCTION__);			\
 } while (0)
 
 #ifndef WARN_ON
@@ -31,7 +43,7 @@
 	int __ret_warn_on = !!(condition);				\
 	if (unlikely(__ret_warn_on)) {					\
 		__WARN();						\
-		printf("WARNING: " format);				\
+		__bug_printf("WARNING: " format);			\
 	}								\
 	unlikely(__ret_warn_on);					\
 })
@@ -44,7 +56,7 @@
 	if (unlikely(__ret_warn_once)) {	\
 		if (WARN(!__warned, format)) {	\
 			__warned = 1;		\
-			dump_stack();		\
+			__bug_dump_stack();	\
 		}				\
 	}					\
 	unlikely(__ret_warn_once);		\
-- 
2.47.3