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Message-Id: <20230123180440.901793-1-helgaas@kernel.org>
Date:   Mon, 23 Jan 2023 12:04:40 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jonathan Corbet <corbet@....net>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH] printk: Document that CONFIG_BOOT_PRINTK_DELAY required for boot_delay=

From: Bjorn Helgaas <bhelgaas@...gle.com>

Document the fact that CONFIG_BOOT_PRINTK_DELAY must be enabled for the
"boot_delay" kernel parameter to work.  Also mention that "lpj=" may be
necessary.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6cfa6e3996cf..b0b40b6a765c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -480,8 +480,9 @@
 			See Documentation/block/cmdline-partition.rst
 
 	boot_delay=	Milliseconds to delay each printk during boot.
-			Values larger than 10 seconds (10000) are changed to
-			no delay (0).
+			Enable CONFIG_BOOT_PRINTK_DELAY and also specify
+			"lpj=".  Boot_delay values larger than 10 seconds
+			(10000) are changed to no delay (0).
 			Format: integer
 
 	bootconfig	[KNL]
-- 
2.25.1

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