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

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Message-ID: <20150511102409.GC15278@pd.tnic>
Date:	Mon, 11 May 2015 12:24:10 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Alexander Kuleshov <kuleshovmail@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v5 2/2] x86/earlyprintk: setup earlyprintk as early as
 possible

On Mon, May 11, 2015 at 04:09:18PM +0600, Alexander Kuleshov wrote:
> 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 patch makes setup_early_printk visible for head{32,64}.c So 'early_printk'
> function will be usabable after decompression of the kernel and before
> parse_early_param will be called. It also safe if CONFIG_CMDLINE_BOOL
> and CONFIG_CMDLINE_OVERRIDE are set, because setup_cmdline function will be
> called before the setup_early_printk.
> 
> Tested it with qemu, so early_printk() is usable and prints to serial console
> right after setup_early_printk function called from arch/x86/kerne/head64.c
> 
> Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
> ---
>  arch/x86/include/asm/serial.h  |  2 ++
>  arch/x86/kernel/early_printk.c | 25 +++++++++++++++++++++++++
>  arch/x86/kernel/head32.c       |  5 +++++
>  arch/x86/kernel/head64.c       |  8 +++++++-
>  4 files changed, 39 insertions(+), 1 deletion(-)

Also, when you send the patches, send them to yourself first and try
applying them. This way you can check whether your sending path doesn't
mangle them for some reason.

And ditto:

ERROR: code indent should use tabs where possible
#91: FILE: arch/x86/kernel/head32.c:35:
+        setup_early_serial_console();$

WARNING: please, no spaces at the start of a line
#91: FILE: arch/x86/kernel/head32.c:35:
+        setup_early_serial_console();$

ERROR: code indent should use tabs where possible
#94: FILE: arch/x86/kernel/head32.c:38:
+                early_printk("Kernel alive\n");$

WARNING: please, no spaces at the start of a line
#94: FILE: arch/x86/kernel/head32.c:38:
+                early_printk("Kernel alive\n");$

total: 2 errors, 3 warnings, 66 lines checked

NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or
      scripts/cleanfile

Your patch has style problems, please review.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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