Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753526AbbEZNJI (ORCPT ); Tue, 26 May 2015 09:09:08 -0400 Received: from [209.85.217.172] ([209.85.217.172]:33682 "EHLO mail-lb0-f172.google.com" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753498AbbEZNIo (ORCPT ); Tue, 26 May 2015 09:08:44 -0400 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 Subject: [PATCH v8 0/3] x86/earlyprintk: setup serial earlyprintk as early as possible Date: Tue, 26 May 2015 19:06:47 +0600 Message-Id: <1432645607-29343-1-git-send-email-kuleshovmail@gmail.com> X-Mailer: git-send-email 2.4.0.350.g9532ead Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2658 Lines: 77 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'. Patchset was tested for both x86 and x86_64 architectures with the qemu. 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 v8: * Fixed warning with the definition of the setup_early_serial_console in the arch/x86/include/asm/setup.h 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(-) -- 2.4.0.350.g9532ead -- 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/