x86, mce: Move debugfs mce dir creating to mce.c

Because more debugfs files under mce dir will be create in mce.c.

ChangeLog:

v5:

- Rebased on x86-tip.git/mce

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

arch/x86/kernel/cpu/mcheck/mce-internal.h

@@ -22,6 +22,7 @@ struct mce_bank {
 };
 
 int mce_severity(struct mce *a, int tolerant, char **msg);
+struct dentry *mce_get_debugfs_dir(void);
 
 extern int mce_ser;
 

arch/x86/kernel/cpu/mcheck/mce-severity.c

@@ -197,7 +197,7 @@ static int __init severities_debugfs_init(void)
 {
 	struct dentry *dmce = NULL, *fseverities_coverage = NULL;
 
-	dmce = debugfs_create_dir("mce", NULL);
+	dmce = mce_get_debugfs_dir();
 	if (dmce == NULL)
 		goto err_out;
 	fseverities_coverage = debugfs_create_file("severities-coverage",
@@ -209,8 +209,6 @@ static int __init severities_debugfs_init(void)
 	return 0;
 
 err_out:
-	if (dmce)
-		debugfs_remove(dmce);
 	return -ENOMEM;
 }
 late_initcall(severities_debugfs_init);

arch/x86/kernel/cpu/mcheck/mce.c

@@ -34,6 +34,7 @@
 #include <linux/smp.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
+#include <linux/debugfs.h>
 
 #include <asm/processor.h>
 #include <asm/hw_irq.h>
@@ -2003,3 +2004,15 @@ static int __init mcheck_disable(char *str)
 	return 1;
 }
 __setup("nomce", mcheck_disable);
+
+#ifdef CONFIG_DEBUG_FS
+struct dentry *mce_get_debugfs_dir(void)
+{
+	static struct dentry *dmce;
+
+	if (!dmce)
+		dmce = debugfs_create_dir("mce", NULL);
+
+	return dmce;
+}
+#endif