linux-kernel - [PATCH 0/2] x86/earlyprintk: setup earlyprintk as early as possible

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Message-Id: <1431285225-5666-1-git-send-email-kuleshovmail@gmail.com>
Date:	Mon, 11 May 2015 01:13:45 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Borislav Petkov <bp@...e.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH 0/2] x86/earlyprintk: setup earlyprintk as early as possible

As setup_early_printk passed to the early_param, it will be usable only after
'parse_early_param' function will be called from the 'setup_arch'. So we have
earlyprintk during early boot and decompression. Next point after decompression
of the kernel where we can use early_printk is after call of the
'parse_early_param'.

These patchset provides two patches where:

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

Alexander Kuleshov (2):
  x86/setup: update boot_command_line with builtin_cmdline in separate
    function
  x86/earlyprintk: setup earlyprintk as early as possible

 arch/x86/include/asm/serial.h  |  2 ++
 arch/x86/include/asm/setup.h   |  3 ++-
 arch/x86/kernel/early_printk.c | 25 +++++++++++++++++++++++++
 arch/x86/kernel/head32.c       |  6 ++++++
 arch/x86/kernel/head64.c       |  7 +++++++
 arch/x86/kernel/setup.c        | 28 +++++++++++++++-------------
 6 files changed, 57 insertions(+), 14 deletions(-)

-- 
2.4.0

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