The patch titled
Subject: kernel/watchdog: provide watchdog_nmi_reconfigure() for arch watchdogs
has been added to the -mm tree. Its filename is
watchdog-provide-watchdog_reconfigure-for-arch-watchdogs.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/watchdog-provide-watchdog_reconfigure-for-arch-watchdogs.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/watchdog-provide-watchdog_reconfigure-for-arch-watchdogs.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Nicholas Piggin <npiggin@xxxxxxxxx>
Subject: kernel/watchdog: provide watchdog_nmi_reconfigure() for arch watchdogs
After reconfiguring watchdog sysctls etc., architecture specific watchdogs
may not get all their parameters updated.
watchdog_nmi_reconfigure() can be implemented to pull the new values in
and set the arch NMI watchdog.
Link: http://lkml.kernel.org/r/20170616065715.18390-5-npiggin@xxxxxxxxx
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Reviewed-by: Don Zickus <dzickus@xxxxxxxxxx>
Tested-by: Babu Moger <babu.moger@xxxxxxxxxx> [sparc]
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/watchdog.c | 29 +++++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff -puN kernel/watchdog.c~watchdog-provide-watchdog_reconfigure-for-arch-watchdogs kernel/watchdog.c
--- a/kernel/watchdog.c~watchdog-provide-watchdog_reconfigure-for-arch-watchdogs
+++ a/kernel/watchdog.c
@@ -123,6 +123,11 @@ void __weak watchdog_nmi_disable(unsigne
{
}
+void __weak watchdog_nmi_reconfigure(void)
+{
+}
+
+
#ifdef CONFIG_SOFTLOCKUP_DETECTOR
/* Helper for online, unparked cpus. */
@@ -600,6 +605,12 @@ static void watchdog_disable_all_cpus(vo
}
}
+static int watchdog_update_cpus(void)
+{
+ return smpboot_update_cpumask_percpu_thread(
+ &watchdog_threads, &watchdog_cpumask);
+}
+
#else /* SOFTLOCKUP */
static int watchdog_park_threads(void)
{
@@ -619,6 +630,11 @@ static void watchdog_disable_all_cpus(vo
{
}
+static int watchdog_update_cpus(void)
+{
+ return 0;
+}
+
static void set_sample_period(void)
{
}
@@ -651,6 +667,8 @@ int lockup_detector_suspend(void)
watchdog_enabled = 0;
}
+ watchdog_nmi_reconfigure();
+
mutex_unlock(&watchdog_proc_mutex);
return ret;
@@ -671,6 +689,8 @@ void lockup_detector_resume(void)
if (watchdog_running && !watchdog_suspended)
watchdog_unpark_threads();
+ watchdog_nmi_reconfigure();
+
mutex_unlock(&watchdog_proc_mutex);
put_online_cpus();
}
@@ -696,6 +716,8 @@ static int proc_watchdog_update(void)
else
watchdog_disable_all_cpus();
+ watchdog_nmi_reconfigure();
+
return err;
}
@@ -881,12 +903,11 @@ int proc_watchdog_cpumask(struct ctl_tab
* a temporary cpumask, so we are likely not in a
* position to do much else to make things better.
*/
-#ifdef CONFIG_SOFTLOCKUP_DETECTOR
- if (smpboot_update_cpumask_percpu_thread(
- &watchdog_threads, &watchdog_cpumask) != 0)
+ if (watchdog_update_cpus() != 0)
pr_err("cpumask update failed\n");
-#endif
}
+
+ watchdog_nmi_reconfigure();
}
out:
mutex_unlock(&watchdog_proc_mutex);
_
Patches currently in -mm which might be from npiggin@xxxxxxxxx are
watchdog-remove-unused-declaration.patch
watchdog-introduce-arch_touch_nmi_watchdog.patch
watchdog-split-up-config-options.patch
watchdog-provide-watchdog_reconfigure-for-arch-watchdogs.patch
powerpc-64s-implement-arch-specific-hardlockup-watchdog.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
