linux-kernel - [PATCH RESEND v5 0/2] x86/earlyprintk: setup earlyprintk as early as possible

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Message-Id: <1431338914-24245-1-git-send-email-kuleshovmail@gmail.com>
Date:	Mon, 11 May 2015 16:08:34 +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:	Alexander Kuleshov <kuleshovmail@...il.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Borislav Petkov <bp@...e.de>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH RESEND v5 0/2] x86/earlyprintk: setup earlyprintk as early as possible

The early_printk function is usable after setup_early_printk will be executed. We
pass 'earlyprintk' through the kernel command line. It means that earlyprintk
will be usable only after the 'parse_early_param' will be executed. So we have
usable earlyprintk only during early boot, kernel decompression and after call
of the 'parse_early_param'. This patchset makes earlyprintk usable before the
call of the 'parse_early_param'.

These patchset provides two patches:

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

Changes v5:

* Call setup_builtin_cmdline instead of setup_cmdline

Changes 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.

Changes 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.

Changes v2:

* Comment added before the setup_early_printk call;
* Added information about testing to the commit message.

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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