linux-kernel - [tip:sched/core] watchdog/softlockup: Fix the SOFTLOCKUP

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Date:   Tue, 10 Jul 2018 09:00:55 -0700
From:   tip-bot for Peter Zijlstra <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, hpa@...or.com, torvalds@...ux-foundation.org,
        peterz@...radead.org, sfr@...b.auug.org.au,
        sachinp@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
        linux-next@...r.kernel.org, mpe@...erman.id.au, tglx@...utronix.de,
        linuxppc-dev@...ts.ozlabs.org, abdhalee@...ux.vnet.ibm.com
Subject: [tip:sched/core] watchdog/softlockup: Fix the SOFTLOCKUP_DETECTOR=n
 build

Commit-ID:  aef92a8bed25d03b8f03ce499a56e8e8e5e2c05e
Gitweb:     https://git.kernel.org/tip/aef92a8bed25d03b8f03ce499a56e8e8e5e2c05e
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Tue, 10 Jul 2018 13:42:10 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 10 Jul 2018 17:56:22 +0200

watchdog/softlockup: Fix the SOFTLOCKUP_DETECTOR=n build

I got confused by all the various CONFIG options here about and
conflated CONFIG_LOCKUP_DETECTOR and CONFIG_SOFTLOCKUP_DETECTOR.

This results in a build failure for:

   CONFIG_LOCKUP_DETECTOR=y && CONFIG_SOFTLOCKUP_DETECTOR=n

As reported by Abdul.

Reported-and-tested-by: Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-next <linux-next@...r.kernel.org>
Cc: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc: mpe <mpe@...erman.id.au>
Cc: sachinp <sachinp@...ux.vnet.ibm.com>
Cc: stephen Rothwell <sfr@...b.auug.org.au>
Fixes: 9cf57731b63e ("watchdog/softlockup: Replace "watchdog/%u" threads with cpu_stop_work")
Link: http://lkml.kernel.org/r/20180710114210.GI2476@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/nmi.h | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index 80664bbeca43..08f9247e9827 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -33,15 +33,10 @@ extern int sysctl_hardlockup_all_cpu_backtrace;
 #define sysctl_hardlockup_all_cpu_backtrace 0
 #endif /* !CONFIG_SMP */
 
-extern int lockup_detector_online_cpu(unsigned int cpu);
-extern int lockup_detector_offline_cpu(unsigned int cpu);
-
 #else /* CONFIG_LOCKUP_DETECTOR */
 static inline void lockup_detector_init(void) { }
 static inline void lockup_detector_soft_poweroff(void) { }
 static inline void lockup_detector_cleanup(void) { }
-#define lockup_detector_online_cpu	NULL
-#define lockup_detector_offline_cpu	NULL
 #endif /* !CONFIG_LOCKUP_DETECTOR */
 
 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
@@ -50,12 +45,18 @@ extern void touch_softlockup_watchdog(void);
 extern void touch_softlockup_watchdog_sync(void);
 extern void touch_all_softlockup_watchdogs(void);
 extern unsigned int  softlockup_panic;
-#else
+
+extern int lockup_detector_online_cpu(unsigned int cpu);
+extern int lockup_detector_offline_cpu(unsigned int cpu);
+#else /* CONFIG_SOFTLOCKUP_DETECTOR */
 static inline void touch_softlockup_watchdog_sched(void) { }
 static inline void touch_softlockup_watchdog(void) { }
 static inline void touch_softlockup_watchdog_sync(void) { }
 static inline void touch_all_softlockup_watchdogs(void) { }
-#endif
+
+#define lockup_detector_online_cpu	NULL
+#define lockup_detector_offline_cpu	NULL
+#endif /* CONFIG_SOFTLOCKUP_DETECTOR */
 
 #ifdef CONFIG_DETECT_HUNG_TASK
 void reset_hung_task_detector(void);