linux-kernel - Re: [PATCH 2/3] early_printk: Add force_early

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Message-ID: <20170928160702.toyh5szu2pwherjl@hirez.programming.kicks-ass.net>
Date:   Thu, 28 Sep 2017 18:07:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     pmladek@...e.com, sergey.senozhatsky@...il.com,
        linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mingo@...nel.org, tglx@...utronix.de
Subject: Re: [PATCH 2/3] early_printk: Add force_early_printk kernel parameter

On Thu, Sep 28, 2017 at 08:41:37AM -0700, Randy Dunlap wrote:

> Please add that kernel parameter to Documentation/admin-guide/kernel-parameters.txt.

Something like so?

--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1165,6 +1165,11 @@
 			parameter will force ia64_sal_cache_flush to call
 			ia64_pal_cache_flush instead of SAL_CACHE_FLUSH.
 
+	force_early_printk
+			Forcefully uses early_console (as per earlyprintk=)
+			usage for regular printk, bypassing everything,
+			including the syslog (dmesg will be empty).
+
 	forcepae [X86-32]
 			Forcefully enable Physical Address Extension (PAE).
 			Many Pentium M systems disable PAE but may have a