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

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Message-ID: <1431329256.28073.40.camel@linux.intel.com>
Date:	Mon, 11 May 2015 10:27:36 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Alexander Kuleshov <kuleshovmail@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, 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: Re: [PATCH 0/2] x86/earlyprintk: setup earlyprintk as early as
 possible

On Mon, 2015-05-11 at 01:13 +0600, Alexander Kuleshov wrote:
> 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'.

>From this description is hard to understand what is rationale of the
proposed changes. Can you rephrase it?

> 
> 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(-)
> 


-- 
Andy Shevchenko <andriy.shevchenko@...el.com>
Intel Finland Oy

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