sh: provide generic arch_debugfs_dir.

While sh previously had its own debugfs root, there now exists a
common arch_debugfs_dir prototype, so we switch everything over to
that.  Presumably once more architectures start making use of this
we'll be able to just kill off the stub kdebugfs wrapper.

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

arch/sh/kernel/Makefile

@@ -12,8 +12,8 @@ endif
 CFLAGS_REMOVE_return_address.o = -pg
 
 obj-y	:= clkdev.o debugtraps.o dma-nommu.o dumpstack.o 		\
-	   idle.o io.o irq.o						\
-	   irq_$(BITS).o machvec.o nmi_debug.o process.o		\
+	   idle.o io.o irq.o irq_$(BITS).o kdebugfs.o			\
+	   machvec.o nmi_debug.o process.o				\
 	   process_$(BITS).o ptrace.o ptrace_$(BITS).o			\
 	   reboot.o return_address.o					\
 	   setup.o signal_$(BITS).o sys_sh.o sys_sh$(BITS).o		\

arch/sh/kernel/kdebugfs.c

@@ -0,0 +1,16 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/debugfs.h>
+
+struct dentry *arch_debugfs_dir;
+EXPORT_SYMBOL(arch_debugfs_dir);
+
+static int __init arch_kdebugfs_init(void)
+{
+	arch_debugfs_dir = debugfs_create_dir("sh", NULL);
+	if (!arch_debugfs_dir)
+		return -ENOMEM;
+
+	return 0;
+}
+arch_initcall(arch_kdebugfs_init);

arch/sh/kernel/setup.c

@@ -24,7 +24,6 @@
 #include <linux/module.h>
 #include <linux/smp.h>
 #include <linux/err.h>
-#include <linux/debugfs.h>
 #include <linux/crash_dump.h>
 #include <linux/mmzone.h>
 #include <linux/clk.h>
@@ -458,17 +457,3 @@ const struct seq_operations cpuinfo_op = {
 	.show	= show_cpuinfo,
 };
 #endif /* CONFIG_PROC_FS */
-
-struct dentry *sh_debugfs_root;
-
-static int __init sh_debugfs_init(void)
-{
-	sh_debugfs_root = debugfs_create_dir("sh", NULL);
-	if (!sh_debugfs_root)
-		return -ENOMEM;
-	if (IS_ERR(sh_debugfs_root))
-		return PTR_ERR(sh_debugfs_root);
-
-	return 0;
-}
-arch_initcall(sh_debugfs_init);