Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753222AbbERJSo (ORCPT ); Mon, 18 May 2015 05:18:44 -0400 Received: from mail-ob0-f182.google.com ([209.85.214.182]:34066 "EHLO mail-ob0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750958AbbERJSf (ORCPT ); Mon, 18 May 2015 05:18:35 -0400 MIME-Version: 1.0 In-Reply-To: <1431940657-9191-1-git-send-email-kuleshovmail@gmail.com> References: <1431940657-9191-1-git-send-email-kuleshovmail@gmail.com> Date: Mon, 18 May 2015 15:18:34 +0600 Message-ID: Subject: Re: [RESEND PATCH v7 0/3] x86/earlyprintk: setup serial earlyprintk as early as possible From: Alexander Kuleshov To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Alexander Kuleshov , Andy Shevchenko , LKML , Greg Kroah-Hartman , Borislav Petkov , Mark Rustad , Yinghai Lu Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2685 Lines: 73 Sorry for noise. Forgot to remove resend. 2015-05-18 15:17 GMT+06:00 Alexander Kuleshov : > The early_printk function is usable only after the setup_early_printk will > be executed. We pass 'earlyprintk' through the kernel command line. So, it > means that earlyprintk will be usable only after the 'parse_early_param' > will be executed. We have usable earlyprintk only during early boot, kernel > decompression and after call of the 'parse_early_param'. This patchset makes > serial earlyprintk usable before the call of the 'parse_early_param'. > > These patchset provides following changes: > > 1. Move handling of the builtin command line to the separate function > from the setup_arch. Now we can call it from the arch/x86/kernel/head{32,64}.c, > and find 'earlyprintk' kernel command line paramter there. > > 2. Provide setup_serial_console function to setup serial earlyprintk in the > arch/x86/kernel/head{32,64}.c > > v7: > > * Move setup_early_serial_console to the the arch/x86/include/setup.h > * Add ifdefs to prevent setup_serial_console if CONFIG_EARLY_PRINTK > is not set. > > v6: > > * Style fixes. > * Call of the suetp_builtin_cmdline moved to the separate patch. > > v5: > > * Call setup_builtin_cmdline instead of setup_cmdline > > v4: > > * Move setup_early_serial_console from the include/linux/printk.h > to the arch/x86/include/asm/serial.h, because this function is only > for x86 now. > > v3: > > * Call setup_cmdline before setup_early_printk; > * setup_early_printk call wrapped with the setup_early_serial_console which > checks that 'serial' given to the earlyprintk command line option. This > prevents call of the setup_early_printk with the given pciserial/dbgp/efi, > because they are using early_ioremap. > > v2: > > * Comment added before the setup_early_printk call; > * Added information about testing to the commit message. > > Alexander Kuleshov (3): > x86/setup: introduce setup_bultin_cmdline > x86/setup: handle builtin command line as early as possible > x86/earlyprintk: setup earlyprintk as early as possible > > arch/x86/include/asm/setup.h | 8 ++++++++ > arch/x86/kernel/early_printk.c | 24 ++++++++++++++++++++++++ > arch/x86/kernel/head32.c | 7 +++++++ > arch/x86/kernel/head64.c | 7 +++++++ > arch/x86/kernel/setup.c | 33 ++++++++++++++++++--------------- > 5 files changed, 64 insertions(+), 15 deletions(-) > > -- > 2.4.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/