sh: Conditionalize the code dumper on CONFIG_DUMP_CODE.

We don't really want this enabled by default, but it is still quite
useful for debugging. So, make it conditional and leave it off by
default.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Author: pmundt

arch/sh/Kconfig.debug

@@ -98,6 +98,18 @@ config IRQSTACKS
 	  for handling hard and soft interrupts.  This can help avoid
 	  overflowing the process kernel stacks.
 
+config DUMP_CODE
+	bool "Show disassembly of nearby code in register dumps"
+	depends on DEBUG_KERNEL && SUPERH32
+	default y if DEBUG_BUGVERBOSE
+	default n
+	help
+	  This prints out a code trace of the instructions leading up to
+	  the faulting instruction as a debugging aid. As this does grow
+	  the kernel in size a bit, most users will want to say N here.
+
+	  Those looking for more verbose debugging output should say Y.
+
 config SH_NO_BSS_INIT
 	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
 	depends on DEBUG_KERNEL

arch/sh/include/asm/processor_32.h

@@ -175,7 +175,15 @@ static __inline__ void enable_fpu(void)
 
 void show_trace(struct task_struct *tsk, unsigned long *sp,
 		struct pt_regs *regs);
+
+#ifdef CONFIG_DUMP_CODE
 void show_code(struct pt_regs *regs);
+#else
+static inline void show_code(struct pt_regs *regs)
+{
+}
+#endif
+
 extern unsigned long get_wchan(struct task_struct *p);
 
 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)

arch/sh/kernel/Makefile_32

@@ -9,7 +9,7 @@ ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_ftrace.o = -pg
 endif
 
-obj-y	:= debugtraps.o disassemble.o idle.o io.o io_generic.o irq.o	\
+obj-y	:= debugtraps.o idle.o io.o io_generic.o irq.o			\
 	   machvec.o process_32.o ptrace_32.o setup.o signal_32.o	\
 	   sys_sh.o sys_sh32.o syscalls_32.o time_32.o topology.o	\
 	   traps.o traps_32.o
@@ -29,5 +29,6 @@ obj-$(CONFIG_IO_TRAPPED)	+= io_trapped.o
 obj-$(CONFIG_KPROBES)		+= kprobes.o
 obj-$(CONFIG_GENERIC_GPIO)	+= gpio.o
 obj-$(CONFIG_DYNAMIC_FTRACE)	+= ftrace.o
+obj-$(CONFIG_DUMP_CODE)		+= disassemble.o
 
 EXTRA_CFLAGS += -Werror