linux-kernel - [PATCH] x86/smp: Update reschedule warning text

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Message-Id: <1492518305-3808-1-git-send-email-prarit@redhat.com>
Date:   Tue, 18 Apr 2017 08:25:05 -0400
From:   Prarit Bhargava <prarit@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Prarit Bhargava <prarit@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Wanpeng Li <wanpeng.li@...mail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Subject: [PATCH] x86/smp: Update reschedule warning text

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

Signed-off-by: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: Wanpeng Li <wanpeng.li@...mail.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
---
 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 d3c66a15bbde..94da6f6971bf 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -124,7 +124,7 @@
 static void native_smp_send_reschedule(int cpu)
 {
 	if (unlikely(cpu_is_offline(cpu))) {
-		WARN_ON(1);
+		WARN(1, "Attempting to schedule on offline CPU %d\n", cpu);
 		return;
 	}
 	apic->send_IPI(cpu, RESCHEDULE_VECTOR);
-- 
1.7.9.3