[next-20180709][bisected 9cf57731][ppc] build fail with ld: BFD version 2.26.1-1.fc25 assertion fail elf64-ppc.c:14734

Greeting's

Today's next fails to build on powerpc with below error

kernel/cpu.o:(.data.rel+0x18e0): undefined reference to
`lockup_detector_online_cpu'
ld: BFD version 2.26.1-1.fc25 assertion fail elf64-ppc.c:14734
kernel/cpu.o:(.data.rel+0x18e8): undefined reference to
`lockup_detector_offline_cpu'
ld: BFD version 2.26.1-1.fc25 assertion fail elf64-ppc.c:14734
Makefile:1005: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

gcc version: 6.4.1
kernel verion: 4.18.0-rc3-next-20180709
Machine: Power8 PowerVM LPAR
config: attached
binutils: binutils-2.26.1-1

Related commit looks to be:

commit 9cf57731b63e37ed995b46690adc604891a9a28f
Author: Peter Zijlstra [off-list ref]
Date:   Thu Jun 7 10:52:03 2018 +0200

    watchdog/softlockup: Replace "watchdog/%u" threads with cpu_stop_work
    
    Oleg suggested to replace the "watchdog/%u" threads with
    cpu_stop_work. That removes one thread per CPU while at the same
time
    fixes softlockup vs SCHED_DEADLINE.
    
-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre

On Mon, Jul 09, 2018 at 03:21:23PM +0530, Abdul Haleem wrote:

Greeting's

Today's next fails to build on powerpc with below error

kernel/cpu.o:(.data.rel+0x18e0): undefined reference to
`lockup_detector_online_cpu'
ld: BFD version 2.26.1-1.fc25 assertion fail elf64-ppc.c:14734
kernel/cpu.o:(.data.rel+0x18e8): undefined reference to
`lockup_detector_offline_cpu'
ld: BFD version 2.26.1-1.fc25 assertion fail elf64-ppc.c:14734
Makefile:1005: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

Urgh, sorry about that. I think the below should cure that.

I got confused by all the varioud CONFIG options here abour and
conflated CONFIG_LOCKUP_DETECTOR and CONFIG_SOFTLOCKUP_DETECTOR it
seems.

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);

On Mon, 2018-07-09 at 13:47 +0200, Peter Zijlstra wrote:

Thanks Peter for the patch, build and boot is fine.

Reported-and-tested-by: Abdul Haleem <redacted>

-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre

On Mon, Jul 09, 2018 at 11:40:14PM +0530, Abdul Haleem wrote:

Thanks Peter for the patch, build and boot is fine.

Reported-and-tested-by: Abdul Haleem <redacted>

Excellent, Ingo can you stick this in?

---
Subject: watchdog/softlockup: Fix SOFTLOCKUP_DETECTOR=n build
From: Peter Zijlstra <peterz@infradead.org>
Date: Mon, 9 Jul 2018 13:47:16 +0200

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.

Cc: Ingo Molnar <mingo@kernel.org>
Cc: stephen Rothwell <redacted>
Cc: linuxppc-dev <redacted>
Cc: sachinp <redacted>
Cc: mpe <mpe@ellerman.id.au>
Reported-and-tested-by: Abdul Haleem <redacted>
Fixes: 9cf57731b63e ("watchdog/softlockup: Replace "watchdog/%u" threads with cpu_stop_work")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180709114716.GN2476@hirez.programming.kicks-ass.net
---
 include/linux/nmi.h |   15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h

@@ -33,15 +33,10 @@ extern int sysctl_hardlockup_all_cpu_bac
 #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(vo
 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);

* Peter Zijlstra [off-list ref] wrote:

On Mon, Jul 09, 2018 at 11:40:14PM +0530, Abdul Haleem wrote:

quoted

Thanks Peter for the patch, build and boot is fine.

Reported-and-tested-by: Abdul Haleem <redacted>

Excellent, Ingo can you stick this in?

Sure, done!

Thanks,

	Ingo

Commit-ID:  aef92a8bed25d03b8f03ce499a56e8e8e5e2c05e
Gitweb:     https://git.kernel.org/tip/aef92a8bed25d03b8f03ce499a56e8e8e5e2c05e
Author:     Peter Zijlstra [off-list ref]
AuthorDate: Tue, 10 Jul 2018 13:42:10 +0200
Committer:  Ingo Molnar [off-list ref]
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 <redacted>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <redacted>
Cc: linux-next <redacted>
Cc: linuxppc-dev <redacted>
Cc: mpe <mpe@ellerman.id.au>
Cc: sachinp <redacted>
Cc: stephen Rothwell <redacted>
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@kernel.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);