linux-kernel - Re: [PATCH 1/1] kernel: panic: display reason at end + pr

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Message-Id: <20140211153445.c03bf3b266880ff0a174cee6@linux-foundation.org>
Date:	Tue, 11 Feb 2014 15:34:45 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org, rdunlap <rdunlap@...radead.org>
Subject: Re: [PATCH 1/1] kernel: panic: display reason at end + pr_emerg

On Sat, 8 Feb 2014 15:45:22 +0800 Fabian Frederick <fabf@...net.be> wrote:

> Currently, booting without initrd specified on 80x25 screen
> gives a call trace followed by atkbd : Spurious ACK.
> Original message ("VFS: Unable to mount root fs") is not available.
> Of course this could happen in other situations...
> 
> -This patch displays panic reason after call trace which could help
> lot of people even if it's not the very last line on screen.

Fair enough.  Hate it when that happens!

> -Converting all panic.c printk(KERN_EMERG to pr_emerg(

You missed a couple.

--- a/kernel/panic.c~kernel-panicc-display-reason-at-end-pr_emerg-fix
+++ a/kernel/panic.c
@@ -275,8 +275,7 @@ unsigned long get_taint(void)
 void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
 {
 	if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off())
-		printk(KERN_WARNING
-		       "Disabling lock debugging due to kernel taint\n");
+		pr_warn("Disabling lock debugging due to kernel taint\n");
 
 	set_bit(flag, &tainted_mask);
 }
@@ -381,8 +380,7 @@ late_initcall(init_oops_id);
 void print_oops_end_marker(void)
 {
 	init_oops_id();
-	printk(KERN_WARNING "---[ end trace %016llx ]---\n",
-		(unsigned long long)oops_id);
+	pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
 }
 
 /*
_

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