Merge branches 'sh/compressors' and 'sh/ftrace'

arch/sh/Kconfig.debug

@@ -61,12 +61,14 @@ config EARLY_PRINTK
 	  select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
 	  the kernel command line option to toggle back and forth.
 
-config DEBUG_STACKOVERFLOW
+config STACK_DEBUG
 	bool "Check for stack overflows"
 	depends on DEBUG_KERNEL && SUPERH32
 	help
 	  This option will cause messages to be printed if free stack space
-	  drops below a certain limit.
+	  drops below a certain limit. Saying Y here will add overhead to
+	  every function call and will therefore incur a major
+	  performance hit. Most users should say N.
 
 config DEBUG_STACK_USAGE
 	bool "Stack utilization instrumentation"
@@ -123,15 +125,9 @@ config SH64_SR_WATCH
 	bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
 	depends on SUPERH64
 
-config STACK_DEBUG
-	bool "Enable diagnostic checks of the kernel stack"
-	depends on FUNCTION_TRACER
-	select DEBUG_STACKOVERFLOW
-	default n
-	help
-	  This option allows checks to be performed on the kernel stack
-	  at runtime. Saying Y here will add overhead to every function
-	  call and will therefore incur a major performance hit. Most
-	  users should say N.
+config MCOUNT
+	def_bool y
+	depends on SUPERH32
+	depends on STACK_DEBUG || FUNCTION_TRACER
 
 endmenu

arch/sh/Makefile

@@ -186,6 +186,10 @@ KBUILD_CFLAGS		+= -pipe $(cflags-y)
 KBUILD_CPPFLAGS		+= $(cflags-y)
 KBUILD_AFLAGS		+= $(cflags-y)
 
+ifeq ($(CONFIG_MCOUNT),y)
+  KBUILD_CFLAGS += -pg
+endif
+
 libs-$(CONFIG_SUPERH32)		:= arch/sh/lib/	$(libs-y)
 libs-$(CONFIG_SUPERH64)		:= arch/sh/lib64/ $(libs-y)
 

arch/sh/boot/compressed/Makefile

@@ -24,7 +24,7 @@ IMAGE_OFFSET	:= $(shell /bin/bash -c 'printf "0x%08x" \
 
 LIBGCC	:= $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
 
-ifeq ($(CONFIG_FUNCTION_TRACER),y)
+ifeq ($(CONFIG_MCOUNT),y)
 ORIG_CFLAGS := $(KBUILD_CFLAGS)
 KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
 endif

arch/sh/kernel/irq.c

@@ -114,23 +114,6 @@ asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs)
 #endif
 
 	irq_enter();
-
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
-	/* Debugging check for stack overflow: is there less than 1KB free? */
-	{
-		long sp;
-
-		__asm__ __volatile__ ("and r15, %0" :
-					"=r" (sp) : "0" (THREAD_SIZE - 1));
-
-		if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
-			printk("do_IRQ: stack overflow: %ld\n",
-			       sp - sizeof(struct thread_info));
-			dump_stack();
-		}
-	}
-#endif
-
 	irq = irq_demux(intc_evt2irq(irq));
 
 #ifdef CONFIG_IRQSTACKS

arch/sh/kernel/sh_ksyms_32.c

@@ -106,8 +106,8 @@ EXPORT_SYMBOL(flush_dcache_page);
 EXPORT_SYMBOL(clear_user_page);
 #endif
 
-#ifdef CONFIG_FUNCTION_TRACER
-EXPORT_SYMBOL(mcount);
+#ifdef CONFIG_MCOUNT
+DECLARE_EXPORT(mcount);
 #endif
 EXPORT_SYMBOL(csum_partial);
 EXPORT_SYMBOL(csum_partial_copy_generic);

arch/sh/lib/Makefile

@@ -24,8 +24,7 @@ memcpy-y			:= memcpy.o
 memcpy-$(CONFIG_CPU_SH4)	:= memcpy-sh4.o
 
 lib-$(CONFIG_MMU)		+= copy_page.o clear_page.o
-lib-$(CONFIG_FUNCTION_TRACER)	+= mcount.o
-lib-$(CONFIG_FUNCTION_GRAPH_TRACER) += mcount.o
+lib-$(CONFIG_MCOUNT)		+= mcount.o
 lib-y				+= $(memcpy-y) $(udivsi3-y)
 
 EXTRA_CFLAGS += -Werror

arch/sh/lib/mcount.S

@@ -1,7 +1,7 @@
 /*
  * arch/sh/lib/mcount.S
  *
- *  Copyright (C) 2008  Paul Mundt
+ *  Copyright (C) 2008, 2009  Paul Mundt
  *  Copyright (C) 2008, 2009  Matt Fleming
  *
  * This file is subject to the terms and conditions of the GNU General Public
@@ -86,13 +86,18 @@
 	.type	mcount,@function
 _mcount:
 mcount:
+	STACK_CHECK()
+
+#ifndef CONFIG_FUNCTION_TRACER
+	rts
+	 nop
+#else
 #ifndef CONFIG_DYNAMIC_FTRACE
 	mov.l	.Lfunction_trace_stop, r0
 	mov.l	@r0, r0
 	tst	r0, r0
 	bf	ftrace_stub
 #endif
-	STACK_CHECK()
 
 	MCOUNT_ENTER()
 
@@ -174,8 +179,6 @@ ftrace_caller:
 	tst	r0, r0
 	bf	ftrace_stub
 
-	STACK_CHECK()
-
 	MCOUNT_ENTER()
 
 	.globl ftrace_call
@@ -192,14 +195,17 @@ ftrace_call:
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 #endif /* CONFIG_DYNAMIC_FTRACE */
 
+	.align 2
+.Lfunction_trace_stop:
+	.long	function_trace_stop
+
 /*
  * NOTE: From here on the locations of the .Lftrace_stub label and
  * ftrace_stub itself are fixed. Adding additional data here will skew
  * the displacement for the memory table and break the block replacement.
  * Place new labels either after the ftrace_stub body, or before
  * ftrace_caller. You have been warned.
  */
-	.align 2
 .Lftrace_stub:
 	.long	ftrace_stub
 
@@ -208,40 +214,6 @@ ftrace_stub:
 	rts
 	 nop
 
-#ifdef CONFIG_STACK_DEBUG
-	.globl	stack_panic
-stack_panic:
-	mov.l	.Ldump_stack, r0
-	jsr	@r0
-	 nop
-
-	mov.l	.Lpanic, r0
-	jsr	@r0
-	 mov.l	.Lpanic_s, r4
-
-	rts
-	 nop
-
-	.align 2
-.Lfunction_trace_stop:
-	.long	function_trace_stop
-.L_ebss:
-	.long	_ebss
-.L_init_thread_union:
-	.long	init_thread_union
-.Lpanic:
-	.long	panic
-.Lpanic_s:
-	.long	.Lpanic_str
-.Ldump_stack:
-	.long	dump_stack
-
-	.section	.rodata
-	.align 2
-.Lpanic_str:
-	.string "Stack error"
-#endif /* CONFIG_STACK_DEBUG */
-
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	.globl	ftrace_graph_caller
 ftrace_graph_caller:
@@ -303,3 +275,36 @@ return_to_handler:
 .Lftrace_return_to_handler:
 	.long	ftrace_return_to_handler
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+#endif /* CONFIG_FUNCTION_TRACER */
+
+#ifdef CONFIG_STACK_DEBUG
+	.globl	stack_panic
+stack_panic:
+	mov.l	.Ldump_stack, r0
+	jsr	@r0
+	 nop
+
+	mov.l	.Lpanic, r0
+	jsr	@r0
+	 mov.l	.Lpanic_s, r4
+
+	rts
+	 nop
+
+	.align 2
+.L_ebss:
+	.long	_ebss
+.L_init_thread_union:
+	.long	init_thread_union
+.Lpanic:
+	.long	panic
+.Lpanic_s:
+	.long	.Lpanic_str
+.Ldump_stack:
+	.long	dump_stack
+
+	.section	.rodata
+	.align 2
+.Lpanic_str:
+	.string "Stack error"
+#endif /* CONFIG_STACK_DEBUG */