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Message-Id: <1528851463-21140-24-git-send-email-ricardo.neri-calderon@linux.intel.com>
Date: Tue, 12 Jun 2018 17:57:43 -0700
From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>
Cc: Andi Kleen <andi.kleen@...el.com>, Ashok Raj <ashok.raj@...el.com>,
Borislav Petkov <bp@...e.de>, Tony Luck <tony.luck@...el.com>,
"Ravi V. Shankar" <ravi.v.shankar@...el.com>, x86@...nel.org,
sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-kernel@...r.kernel.org,
Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
Jacob Pan <jacob.jun.pan@...el.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Don Zickus <dzickus@...hat.com>,
Nicholas Piggin <npiggin@...il.com>,
Michael Ellerman <mpe@...erman.id.au>,
Frederic Weisbecker <frederic@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Babu Moger <babu.moger@...cle.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Philippe Ombredanne <pombredanne@...b.com>,
Colin Ian King <colin.king@...onical.com>,
Byungchul Park <byungchul.park@....com>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
"Luis R. Rodriguez" <mcgrof@...nel.org>,
Waiman Long <longman@...hat.com>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Randy Dunlap <rdunlap@...radead.org>,
Davidlohr Bueso <dave@...olabs.net>,
Christoffer Dall <cdall@...aro.org>,
Marc Zyngier <marc.zyngier@....com>,
Kai-Heng Feng <kai.heng.feng@...onical.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
David Rientjes <rientjes@...gle.com>,
iommu@...ts.linux-foundation.org
Subject: [RFC PATCH 23/23] watchdog/hardlockup: Activate the HPET-based lockup detector
Now that the implementation of the HPET-based hardlockup detector is
complete, enable it. It will be used only if it can be initialized
successfully. Otherwise, the perf-based detector will be used.
Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Andi Kleen <andi.kleen@...el.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Jacob Pan <jacob.jun.pan@...el.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Frederic Weisbecker <frederic@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Babu Moger <babu.moger@...cle.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Philippe Ombredanne <pombredanne@...b.com>
Cc: Colin Ian King <colin.king@...onical.com>
Cc: Byungchul Park <byungchul.park@....com>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc: Waiman Long <longman@...hat.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Christoffer Dall <cdall@...aro.org>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@...el.com>
Cc: x86@...nel.org
Cc: iommu@...ts.linux-foundation.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
---
kernel/watchdog.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index b5ce6e4..e2cc6c0 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -149,6 +149,21 @@ int __weak __init watchdog_nmi_probe(void)
{
int ret = -ENODEV;
+ /*
+ * Try first with the HPET hardlockup detector. It will only
+ * succeed if selected at build time and the nmi_watchdog
+ * command-line parameter is configured. This ensure that the
+ * perf-based detector is used by default, if selected at
+ * build time.
+ */
+ if (IS_ENABLED(CONFIG_HARDLOCKUP_DETECTOR_HPET))
+ ret = hardlockup_detector_hpet_ops.init();
+
+ if (!ret) {
+ nmi_wd_ops = &hardlockup_detector_hpet_ops;
+ return ret;
+ }
+
if (IS_ENABLED(CONFIG_HARDLOCKUP_DETECTOR_PERF))
ret = hardlockup_detector_perf_ops.init();
--
2.7.4
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