X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-powerpc%2Fbug.h;h=f44b529e329821a91a2fedf715ac83b55f6f3085;hb=ba290ab7dace8b3339c0cc86c221d48eed21e956;hp=b001ecb3cd9956030f8520b6fad183eb3186eee7;hpb=ca869912366f60cb5e0bdd09f65e80ee6816e73c;p=linux-2.6-omap-h63xx.git

diff --git a/include/asm-powerpc/bug.h b/include/asm-powerpc/bug.h
index b001ecb3cd9..f44b529e329 100644
--- a/include/asm-powerpc/bug.h
+++ b/include/asm-powerpc/bug.h
@@ -1,5 +1,6 @@
 #ifndef _ASM_POWERPC_BUG_H
 #define _ASM_POWERPC_BUG_H
+#ifdef __KERNEL__
 
 #include <asm/asm-compat.h>
 /*
@@ -29,34 +30,60 @@ struct bug_entry *find_bug(unsigned long bugaddr);
 
 #ifdef CONFIG_BUG
 
+/*
+ * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
+ * optimisations. However depending on the complexity of the condition
+ * some compiler versions may not produce optimal results.
+ */
+
 #define BUG() do {							 \
 	__asm__ __volatile__(						 \
 		"1:	twi 31,0,0\n"					 \
 		".section __bug_table,\"a\"\n"				 \
-		"\t"PPC_LONG"	1b,%0,%1,%2\n"			 \
+		"\t"PPC_LONG"	1b,%0,%1,%2\n"				 \
 		".previous"						 \
 		: : "i" (__LINE__), "i" (__FILE__), "i" (__FUNCTION__)); \
 } while (0)
 
 #define BUG_ON(x) do {						\
-	__asm__ __volatile__(					\
+	if (__builtin_constant_p(x)) {				\
+		if (x)						\
+			BUG();					\
+	} else {						\
+		__asm__ __volatile__(				\
 		"1:	"PPC_TLNEI"	%0,0\n"			\
 		".section __bug_table,\"a\"\n"			\
-		"\t"PPC_LONG"	1b,%1,%2,%3\n"		\
+		"\t"PPC_LONG"	1b,%1,%2,%3\n"			\
 		".previous"					\
 		: : "r" ((long)(x)), "i" (__LINE__),		\
 		    "i" (__FILE__), "i" (__FUNCTION__));	\
+	}							\
 } while (0)
 
-#define WARN_ON(x) do {						\
+#define __WARN() do {						\
 	__asm__ __volatile__(					\
+		"1:	twi 31,0,0\n"				\
+		".section __bug_table,\"a\"\n"			\
+		"\t"PPC_LONG"	1b,%0,%1,%2\n"			\
+		".previous"					\
+		: : "i" (__LINE__ + BUG_WARNING_TRAP),		\
+		    "i" (__FILE__), "i" (__FUNCTION__));	\
+} while (0)
+
+#define WARN_ON(x) do {						\
+	if (__builtin_constant_p(x)) {				\
+		if (x)						\
+			__WARN();				\
+	} else {						\
+		__asm__ __volatile__(				\
 		"1:	"PPC_TLNEI"	%0,0\n"			\
 		".section __bug_table,\"a\"\n"			\
-		"\t"PPC_LONG"	1b,%1,%2,%3\n"		\
+		"\t"PPC_LONG"	1b,%1,%2,%3\n"			\
 		".previous"					\
 		: : "r" ((long)(x)),				\
 		    "i" (__LINE__ + BUG_WARNING_TRAP),		\
 		    "i" (__FILE__), "i" (__FUNCTION__));	\
+	}							\
 } while (0)
 
 #define HAVE_ARCH_BUG
@@ -67,4 +94,5 @@ struct bug_entry *find_bug(unsigned long bugaddr);
 
 #include <asm-generic/bug.h>
 
+#endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_BUG_H */