linux-kernel - [PATCH] ntp, add debugfs entries for time_status and time

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Date:	Thu,  4 Oct 2012 09:48:41 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Prarit Bhargava <prarit@...hat.com>,
	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] ntp, add debugfs entries for time_status and time_state

Add debugfs entries for ntp time_status and time_state.  These are useful
for debugging ntp issues.

Signed-off-by: Prarit Bhargava <prarit@...hat.com>
Cc: John Stultz <johnstul@...ibm.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/ntp.c |   40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 24174b4..e1ba393 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -15,6 +15,7 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/module.h>
+#include <linux/debugfs.h>
 
 #include "tick-internal.h"
 
@@ -965,3 +966,42 @@ void __init ntp_init(void)
 {
 	ntp_clear();
 }
+
+static int time_status_get(void *data, u64 *val)
+{
+	*val = time_status;
+	return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(time_status_fops, time_status_get, NULL, "0x%0llx\n");
+
+static int time_state_get(void *data, u64 *val)
+{
+	*val = time_state;
+	return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(time_state_fops, time_state_get, NULL, "0x%llx\n");
+
+static int __init ntp_debugfs_init(void)
+{
+	struct dentry *ntp_dentry, *time_status_dentry, *time_state_dentry;
+
+	ntp_dentry = debugfs_create_dir("ntp", NULL);
+	if (!ntp_dentry)
+		return -ENOMEM;
+
+	time_status_dentry = debugfs_create_file("time_status", 0444,
+						 ntp_dentry, NULL,
+						 &time_status_fops);
+	if (!time_status_dentry)
+		return -ENOMEM;
+
+	time_state_dentry = debugfs_create_file("time_state", 0444,
+						ntp_dentry, NULL,
+						&time_state_fops);
+	if (!time_state_dentry)
+		return -ENOMEM;
+
+	return 0;
+}
+/* debugfs init is core_initcall */
+postcore_initcall(ntp_debugfs_init);
-- 
1.7.9.3

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