From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1C9383DB8F for ; Wed, 15 Nov 2023 20:04:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="1l+HUcGu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1827C433C9; Wed, 15 Nov 2023 20:04:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700078647; bh=5oMSzBq/lgDe0Pa32gdYVYaZBke34mBiupVzPo+le1Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1l+HUcGuSHSiORnAhhpOYdq13VkyKFENCrtJTVr9o7qZ4vmrAz0q0imrWShZArU2p nDlMptFgm2fz1aGQp8ce/ZmgdPl7asxJg5e2+Y5uW/6Bc2klv/keyY+gLX+9JYmnCu 7hlMhUcDOoW0BJKVbyKzN0knv6M8taV6qgDUxHrI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Geert Uytterhoeven , John Paul Adrian Glaubitz , Sasha Levin Subject: [PATCH 4.14 22/45] sh: bios: Revive earlyprintk support Date: Wed, 15 Nov 2023 14:32:59 -0500 Message-ID: <20231115191420.919449823@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115191419.641552204@linuxfoundation.org> References: <20231115191419.641552204@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Geert Uytterhoeven [ Upstream commit 553f7ac78fbb41b2c93ab9b9d78e42274d27daa9 ] The SuperH BIOS earlyprintk code is protected by CONFIG_EARLY_PRINTK. However, when this protection was added, it was missed that SuperH no longer defines an EARLY_PRINTK config symbol since commit e76fe57447e88916 ("sh: Remove old early serial console code V2"), so BIOS earlyprintk can no longer be used. Fix this by reviving the EARLY_PRINTK config symbol. Fixes: d0380e6c3c0f6edb ("early_printk: consolidate random copies of identical code") Signed-off-by: Geert Uytterhoeven Reviewed-by: John Paul Adrian Glaubitz Link: https://lore.kernel.org/r/c40972dfec3dcc6719808d5df388857360262878.1697708489.git.geert+renesas@glider.be Signed-off-by: John Paul Adrian Glaubitz Signed-off-by: Sasha Levin --- arch/sh/Kconfig.debug | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug index 4209405179262..4737cbd95cd53 100644 --- a/arch/sh/Kconfig.debug +++ b/arch/sh/Kconfig.debug @@ -29,6 +29,17 @@ config STACK_DEBUG every function call and will therefore incur a major performance hit. Most users should say N. +config EARLY_PRINTK + bool "Early printk" + depends on SH_STANDARD_BIOS + help + Say Y here to redirect kernel printk messages to the serial port + used by the SH-IPL bootloader, starting very early in the boot + process and ending when the kernel's serial console is initialised. + This option is only useful while porting the kernel to a new machine, + when the kernel may crash or hang before the serial console is + initialised. If unsure, say N. + config 4KSTACKS bool "Use 4Kb for kernel stacks instead of 8Kb" depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB -- 2.42.0