linux-kernel - [tip:sched/core] sched/x86: Update reschedule warning text

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Date:   Thu, 20 Apr 2017 04:17:19 -0700
From:   tip-bot for Prarit Bhargava <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, wanpeng.li@...mail.com, rostedt@...dmis.org,
        hpa@...or.com, peterz@...radead.org, akpm@...ux-foundation.org,
        prarit@...hat.com, linux-kernel@...r.kernel.org,
        bristot@...hat.com, hidehiro.kawai.ez@...achi.com,
        mingo@...nel.org, torvalds@...ux-foundation.org
Subject: [tip:sched/core] sched/x86: Update reschedule warning text

Commit-ID:  21173d0b4d2a0b9e9e5f3155cf2cfc5781a6f4b1
Gitweb:     http://git.kernel.org/tip/21173d0b4d2a0b9e9e5f3155cf2cfc5781a6f4b1
Author:     Prarit Bhargava <prarit@...hat.com>
AuthorDate: Tue, 18 Apr 2017 08:25:05 -0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 20 Apr 2017 10:14:30 +0200

sched/x86: Update reschedule warning text

Modify the reschedule warning to output the offline CPU number and
use a better debug message.

Signed-off-by: Prarit Bhargava <prarit@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Wanpeng Li <wanpeng.li@...mail.com>
Link: http://lkml.kernel.org/r/1492518305-3808-1-git-send-email-prarit@redhat.com
[ Tweaked the warning message. ]
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index d3c66a1..3cab841 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -124,7 +124,7 @@ static bool smp_no_nmi_ipi = false;
 static void native_smp_send_reschedule(int cpu)
 {
 	if (unlikely(cpu_is_offline(cpu))) {
-		WARN_ON(1);
+		WARN(1, "sched: Unexpected reschedule of offline CPU#%d!\n", cpu);
 		return;
 	}
 	apic->send_IPI(cpu, RESCHEDULE_VECTOR);