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. Link: http://lkml.kernel.org/r/[email protected] To: Steven Rostedt <[email protected]> To: Andi Kleen <[email protected]> To: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Dave Young <[email protected]> Reviewed-by: Sergey Senozhatsky <[email protected]> Reviewed-by: Simon Horman <[email protected]> Signed-off-by: Petr Mladek <[email protected]>
josf · Feb 8, 2018 · 097114a · 097114a
1 parent ab486bc
commit 097114a
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/kernel/printk/printk.c b/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>
@@ -3287,9 +3288,11 @@ void __init dump_stack_set_arch_desc(const char *fmt, ...)
  */
 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,
-	       print_tainted(), init_utsname()->release,
+	       kexec_crash_loaded() ? "Kdump: loaded " : "",
+	       print_tainted(),
+	       init_utsname()->release,
 	       (int)strcspn(init_utsname()->version, " "),
 	       init_utsname()->version);