[MIPS] Use conditional traps for BUG_ON on MIPS II and better.

This shaves of around 4kB and a few cycles for the average kernel that
has CONFIG_BUG enabled.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 12 insertions, 2 deletions

diff --git a/include/asm-mips/bug.h b/include/asm-mips/bug.h
index 7b4739dc8f3f..4d560a533940 100644
--- a/include/asm-mips/bug.h
+++ b/include/asm-mips/bug.h
@@ -1,6 +1,7 @@
 #ifndef __ASM_BUG_H
 #define __ASM_BUG_H
 
+#include <asm/sgidefs.h>
 
 #ifdef CONFIG_BUG
 
@@ -13,6 +14,17 @@ do {									\
 
 #define HAVE_ARCH_BUG
 
+#if (_MIPS_ISA > _MIPS_ISA_MIPS1)
+
+#define BUG_ON(condition)                                               \
+do {                                                                    \
+        __asm__ __volatile__("tne $0, %0" : : "r" (condition));         \
+} while (0)
+
+#define HAVE_ARCH_BUG_ON
+
+#endif /* _MIPS_ISA > _MIPS_ISA_MIPS1 */
+
 #endif
 
 #include <asm-generic/bug.h>
diff --git a/include/asm-mips/ptrace.h b/include/asm-mips/ptrace.h
index 5f3a9075cd28..30bf555faeaa 100644
--- a/include/asm-mips/ptrace.h
+++ b/include/asm-mips/ptrace.h
@@ -80,8 +80,6 @@ struct pt_regs {
 #define instruction_pointer(regs) ((regs)->cp0_epc)
 #define profile_pc(regs) instruction_pointer(regs)
 
-extern void show_regs(struct pt_regs *);
-
 extern asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit);
 
 #endif