From: Don Zickus <dzickus@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
uobergfe@redhat.com, Don Zickus <dzickus@redhat.com>
Subject: [PATCH 5/9] watchdog: introduce separate handlers for parameters in /proc/sys/kernel
Date: Tue, 4 Nov 2014 11:20:20 -0500 [thread overview]
Message-ID: <1415118024-194247-6-git-send-email-dzickus@redhat.com> (raw)
In-Reply-To: <1415118024-194247-1-git-send-email-dzickus@redhat.com>
From: Ulrich Obergfell <uobergfe@redhat.com>
Separate handlers for each watchdog parameter in /proc/sys/kernel
replace the proc_dowatchdog() function. Three of those handlers
merely call proc_watchdog_common() with one different argument.
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
---
include/linux/nmi.h | 8 +++++++
kernel/watchdog.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+), 0 deletions(-)
diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index 3885a7d..5b54505 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -74,6 +74,14 @@ extern int watchdog_user_enabled;
extern int watchdog_thresh;
extern int sysctl_softlockup_all_cpu_backtrace;
struct ctl_table;
+extern int proc_watchdog(struct ctl_table *, int ,
+ void __user *, size_t *, loff_t *);
+extern int proc_nmi_watchdog(struct ctl_table *, int ,
+ void __user *, size_t *, loff_t *);
+extern int proc_soft_watchdog(struct ctl_table *, int ,
+ void __user *, size_t *, loff_t *);
+extern int proc_watchdog_thresh(struct ctl_table *, int ,
+ void __user *, size_t *, loff_t *);
extern int proc_dowatchdog(struct ctl_table *, int ,
void __user *, size_t *, loff_t *);
#endif
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 7626208..2897a5e 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -769,6 +769,65 @@ out:
}
/*
+ * /proc/sys/kernel/watchdog
+ */
+int proc_watchdog(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return proc_watchdog_common(NMI_WATCHDOG_ENABLED|SOFT_WATCHDOG_ENABLED,
+ table, write, buffer, lenp, ppos);
+}
+
+/*
+ * /proc/sys/kernel/nmi_watchdog
+ */
+int proc_nmi_watchdog(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return proc_watchdog_common(NMI_WATCHDOG_ENABLED,
+ table, write, buffer, lenp, ppos);
+}
+
+/*
+ * /proc/sys/kernel/soft_watchdog
+ */
+int proc_soft_watchdog(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return proc_watchdog_common(SOFT_WATCHDOG_ENABLED,
+ table, write, buffer, lenp, ppos);
+}
+
+/*
+ * /proc/sys/kernel/watchdog_thresh
+ */
+int proc_watchdog_thresh(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int err, old;
+
+ mutex_lock(&watchdog_proc_mutex);
+
+ old = ACCESS_ONCE(watchdog_thresh);
+ err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+
+ if (err || !write)
+ goto out;
+
+ /*
+ * Update the sample period.
+ * Restore 'watchdog_thresh' on failure.
+ */
+ set_sample_period();
+ err = proc_watchdog_update();
+ if (err)
+ watchdog_thresh = old;
+out:
+ mutex_unlock(&watchdog_proc_mutex);
+ return err;
+}
+
+/*
* proc handler for /proc/sys/kernel/nmi_watchdog,watchdog_thresh
*/
--
1.7.1
next prev parent reply other threads:[~2014-11-04 16:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-04 16:20 [PATCH 0/9] watchdog: internally split softlockup and hardlockup Don Zickus
2014-11-04 16:20 ` [PATCH 1/9] watchdog: new definitions and variables, initialization Don Zickus
2014-11-04 16:20 ` [PATCH 2/9] watchdog: introduce the proc_watchdog_update() function Don Zickus
2014-11-04 16:20 ` [PATCH 3/9] watchdog: move definition of 'watchdog_proc_mutex' outside of proc_dowatchdog() Don Zickus
2014-11-04 16:20 ` [PATCH 4/9] watchdog: introduce the proc_watchdog_common() function Don Zickus
2014-11-04 16:20 ` Don Zickus [this message]
2014-11-04 16:20 ` [PATCH 6/9] watchdog: implement error handling for failure to set up hardware perf events Don Zickus
2014-11-04 16:20 ` [PATCH 7/9] watchdog: enable the new user interface of the watchdog mechanism Don Zickus
2014-11-04 16:20 ` [PATCH 8/9] watchdog: clean up some function names and arguments Don Zickus
2014-11-04 16:20 ` [PATCH 9/9] watchdog: introduce the hardlockup_detector_disable() function Don Zickus
2014-12-17 21:25 ` [PATCH 0/9] watchdog: internally split softlockup and hardlockup Don Zickus
2015-01-21 14:15 ` Don Zickus
2015-01-21 22:23 ` Andrew Morton
2015-02-05 20:40 Don Zickus
2015-02-05 20:40 ` [PATCH 5/9] watchdog: introduce separate handlers for parameters in /proc/sys/kernel Don Zickus
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