linux-kernel - Re: [RESEND PATCH v7 0/3] x86/earlyprintk: setup serial earlyprintk as early as possible

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Date:	Mon, 18 May 2015 15:18:34 +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: Re: [RESEND PATCH v7 0/3] x86/earlyprintk: setup serial earlyprintk
 as early as possible

Sorry for noise. Forgot to remove resend.

2015-05-18 15:17 GMT+06:00 Alexander Kuleshov <kuleshovmail@...il.com>:
> 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
>
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