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print kdump kernel loaded status in stack dump

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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.

Link: http://lkml.kernel.org/r/20180127041129.GA29016@dhcp-128-65.nay.redhat.com
To: Steven Rostedt <rostedt@goodmis.org>
To: Andi Kleen <ak@linux.intel.com>
To: kexec@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org
Cc: kexec@lists.infradead.org
Signed-off-by: Dave Young <dyoung@redhat.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Dave Young 2018-01-27 12:11:29 +08:00 committed by Petr Mladek
parent ab486bc9a5
commit 097114aa6e
1 changed files with 5 additions and 2 deletions
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7
kernel/printk/printk.c
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@ -48,6 +48,7 @@
#include <linux/sched/clock.h> #include <linux/sched/clock.h>
#include <linux/sched/debug.h> #include <linux/sched/debug.h>
#include <linux/sched/task_stack.h> #include <linux/sched/task_stack.h>
#include <linux/kexec.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <asm/sections.h> #include <asm/sections.h>
@ -3287,9 +3288,11 @@ void __init dump_stack_set_arch_desc(const char *fmt, ...)
*/ */
void dump_stack_print_info(const char *log_lvl) void dump_stack_print_info(const char *log_lvl)
{ {
printk("%sCPU: %d PID: %d Comm: %.20s %s %s %.*s\n", printk("%sCPU: %d PID: %d Comm: %.20s %s%s %s %.*s\n",
log_lvl, raw_smp_processor_id(), current->pid, current->comm, log_lvl, raw_smp_processor_id(), current->pid, current->comm,
print_tainted(), init_utsname()->release, kexec_crash_loaded() ? "Kdump: loaded " : "",
print_tainted(),
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "), (int)strcspn(init_utsname()->version, " "),
init_utsname()->version); init_utsname()->version);