linux-kernel - [PATCH] print kdump kernel loaded status in stack dump

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Message-ID: <20180117045057.GA4994@dhcp-128-65.nay.redhat.com>
Date:   Wed, 17 Jan 2018 12:50:57 +0800
From:   Dave Young <dyoung@...hat.com>
To:     pmladek@...e.com, sergey.senozhatsky@...il.com,
        rostedt@...dmis.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, kexec@...ts.infradead.org
Subject: [PATCH] print kdump kernel loaded status in stack dump

It is useful to print kdump kernel loaded status in dump_stack() 
especially when panic happens so that we can  differenciate 
kdump kernel early hang and a normal panic in a bug report.

Signed-off-by: Dave Young <dyoung@...hat.com>
---
 kernel/printk/printk.c |    3 +++
 1 file changed, 3 insertions(+)

--- linux-x86.orig/kernel/printk/printk.c
+++ linux-x86/kernel/printk/printk.c
@@ -48,6 +48,7 @@
 #include <linux/sched/clock.h>
 #include <linux/sched/debug.h>
 #include <linux/sched/task_stack.h>
+#include <linux/kexec.h>
 
 #include <linux/uaccess.h>
 #include <asm/sections.h>
@@ -3127,6 +3128,8 @@ void dump_stack_print_info(const char *l
 	if (dump_stack_arch_desc_str[0] != '\0')
 		printk("%sHardware name: %s\n",
 		       log_lvl, dump_stack_arch_desc_str);
+	if (kexec_crash_loaded())
+		printk("%skdump kernel loaded\n", log_lvl);
 
 	print_worker_info(log_lvl, current);
 }