linux-kernel - [PATCH 10/11] pstore/platform: Make automatic updates interval configurable

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Message-Id: <1338038429-21945-10-git-send-email-anton.vorontsov@linaro.org>
Date:	Sat, 26 May 2012 06:20:28 -0700
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Colin Cross <ccross@...roid.com>,
	Tony Luck <tony.luck@...el.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>,
	Shuah Khan <shuahkhan@...il.com>, arve@...roid.com,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Jesper Juhl <jj@...osbits.net>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Meyer <thomas@...3r.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com
Subject: [PATCH 10/11] pstore/platform: Make automatic updates interval configurable

There is no behavioural change, the default value is still 60 seconds.

Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
Acked-by: Kees Cook <keescook@...omium.org>
---
 fs/pstore/platform.c |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 61461ed..34ca314 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -31,6 +31,7 @@
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/hardirq.h>
+#include <linux/jiffies.h>
 #include <linux/workqueue.h>
 
 #include "internal.h"
@@ -40,7 +41,10 @@
  * whether the system is actually still running well enough
  * to let someone see the entry
  */
-#define	PSTORE_INTERVAL	(60 * HZ)
+static int pstore_update_ms = 60000;
+module_param_named(update_ms, pstore_update_ms, int, 0600);
+MODULE_PARM_DESC(update_ms, "milliseconds before pstore updates its content "
+		 "(default is 60000; -1 means runtime updates are disabled)");
 
 static int pstore_new_entry;
 
@@ -231,8 +235,11 @@ int pstore_register(struct pstore_info *psi)
 	kmsg_dump_register(&pstore_dumper);
 	pstore_register_console();
 
-	pstore_timer.expires = jiffies + PSTORE_INTERVAL;
-	add_timer(&pstore_timer);
+	if (pstore_update_ms >= 0) {
+		pstore_timer.expires = jiffies +
+			msecs_to_jiffies(pstore_update_ms);
+		add_timer(&pstore_timer);
+	}
 
 	return 0;
 }
@@ -291,7 +298,7 @@ static void pstore_timefunc(unsigned long dummy)
 		schedule_work(&pstore_work);
 	}
 
-	mod_timer(&pstore_timer, jiffies + PSTORE_INTERVAL);
+	mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms));
 }
 
 module_param(backend, charp, 0444);
-- 
1.7.9.2

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