From nobody Thu Apr 9 12:06:24 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA6C5C38142 for ; Mon, 23 Jan 2023 18:05:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233335AbjAWSFL (ORCPT ); Mon, 23 Jan 2023 13:05:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233819AbjAWSEs (ORCPT ); Mon, 23 Jan 2023 13:04:48 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E14DD14EB4; Mon, 23 Jan 2023 10:04:47 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 2AE32CE13D8; Mon, 23 Jan 2023 18:04:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E909C433D2; Mon, 23 Jan 2023 18:04:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1674497084; bh=OByf8UAQM1froAa+EUYWH+/qVy3lENGQq0kU0er7rIg=; h=From:To:Cc:Subject:Date:From; b=PPvjHG53TbpIbBr3Hnznki5PAgCGX8jgVoYqJt5LM9JMrYEyCFVrjjm9nZyCx1sqt cJsdpCwIpx6hJ6JONade8ZXntrS9NfzgwjdLh4Y2rEMhaz6lS6Sd58qb2WFi8of0aJ SkqpuFZqUiRY96bXwue5KnpTI9/5Q910oP0JqDU2h0KQFqRDrSsP9fuw23gmGahDsL 6yZr8RqGVe5MjJws6ICQbQt8gAocDm7rdIoHMwSlBXGP2OAo9kG2asFIhQGmAxdjwf rZK5SDKHmGfaUirLjUkYK1UWtkEBs0czoDpUfBhBJuzz5GVcdSvIFLCMbkH8QxCbu6 ET9ZKE0tOuvdQ== From: Bjorn Helgaas To: Jonathan Corbet Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Bjorn Helgaas Subject: [PATCH] printk: Document that CONFIG_BOOT_PRINTK_DELAY required for boot_delay= Date: Mon, 23 Jan 2023 12:04:40 -0600 Message-Id: <20230123180440.901793-1-helgaas@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Bjorn Helgaas Document the fact that CONFIG_BOOT_PRINTK_DELAY must be enabled for the "boot_delay" kernel parameter to work. Also mention that "lpj=3D" may be necessary. Signed-off-by: Bjorn Helgaas --- Documentation/admin-guide/kernel-parameters.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/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 =20 boot_delay=3D 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=3D". Boot_delay values larger than 10 seconds + (10000) are changed to no delay (0). Format: integer =20 bootconfig [KNL] --=20 2.25.1