[RFC 4/8] bug: Allow architectures to provide __WARN_printf()

[Peter Zijlstra <peterz@infradead.org>]

Instead of providing __WARN_FLAGS(), allow an architecture to provide
__WARN_printf(), which allows for optimizing WARN(), rather than
WARN_ON().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 include/asm-generic/bug.h |   21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -94,14 +94,7 @@ void warn_slowpath_fmt(const char *file,
 		       const char *fmt, ...);
 extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
 
-#ifndef __WARN_FLAGS
-#define __WARN()		__WARN_printf(TAINT_WARN, NULL)
-#define __WARN_printf(taint, arg...) do {				\
-		instrumentation_begin();				\
-		warn_slowpath_fmt(__FILE__, __LINE__, taint, arg);	\
-		instrumentation_end();					\
-	} while (0)
-#else
+#if defined(__WARN_FLAGS) && !defined(__WARN_printf)
 #define __WARN()		__WARN_FLAGS(BUGFLAG_TAINT(TAINT_WARN))
 #define __WARN_printf(taint, arg...) do {				\
 		instrumentation_begin();				\
@@ -118,6 +111,18 @@ extern __printf(1, 2) void __warn_printk
 })
 #endif
 
+#ifndef __WARN_printf
+#define __WARN_printf(taint, arg...) do {				\
+		instrumentation_begin();				\
+		warn_slowpath_fmt(__FILE__, __LINE__, taint, arg);	\
+		instrumentation_end();					\
+	} while (0)
+#endif
+
+#ifndef __WARN
+#define __WARN()		__WARN_printf(TAINT_WARN, NULL)
+#endif
+
 /* used internally by panic.c */
 
 #ifndef WARN_ON