linux-kernel - [RFC][PATCH] panic: make panic start/end messages consistent

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Message-Id: <20190426063356.20453-1-sergey.senozhatsky@gmail.com>
Date:   Fri, 26 Apr 2019 15:33:56 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: [RFC][PATCH] panic: make panic start/end messages consistent

We don't have consistency:
- we always print panic header
	pr_emerg("Kernel panic - not syncing:")

- but we don't always print panic footer
	pr_emerg("---[ end Kernel panic - not syncing:")

For instance, no panic footer (end panic) message will be
printed when panic_timeout is set - the kernel will either
reboot immediately after console_flush_on_panic() (emergency
restart) or after panic_timeout seconds. Additionally,
panic_print_sys_info() goes before panic footer line, which
doesn't look very right, panic_print_sys_info() is just
additional debugging into.

Let's make it consistent:

	pr_emerg("Kernel panic - not syncing:")
	dump_stack();
	console_flush_on_panic();
	pr_emerg("---[ end Kernel panic - not syncing:")

	panic_print_sys_info();
	/* the rest */
	/* panic_timeout handling */

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 kernel/panic.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/panic.c b/kernel/panic.c
index 40882dad9f70..6482e4b54f0b 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -282,6 +282,7 @@ void panic(const char *fmt, ...)
 	 */
 	debug_locks_off();
 	console_flush_on_panic(CONSOLE_FLUSH_PENDING);
+	pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
 
 	panic_print_sys_info();
 
@@ -331,8 +332,6 @@ void panic(const char *fmt, ...)
 		disabled_wait(caller);
 	}
 #endif
-	pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
-
 	/* Do not scroll important messages printed above */
 	suppress_printk = 1;
 	local_irq_enable();
-- 
2.21.0