linux-kernel - Re: [origin tree boot hang] [PATCH] Revert "early

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Date:	Thu, 1 Oct 2009 10:34:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	Johannes Weiner <hannes@...xchg.org>, Len Brown <lenb@...nel.org>,
	Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [origin tree boot hang] [PATCH] Revert "early_printk:
	Allowmorethan one early console"


* Jason Wessel <jason.wessel@...driver.com> wrote:

> >From 047b893e33041dbaf17b2a7eb03ea20486344d6f Mon Sep 17 00:00:00 2001
> From: Jason Wessel <jason.wessel@...driver.com>
> Date: Thu, 24 Sep 2009 09:00:01 -0500
> Subject: [PATCH 1/1] x86,earlyprintk: Fix regression to handle serial,ttySn as 1 arg
> 
> Commit c9530948bc626c8b638015c0b32abb9615659ec6 introduced a
> regression in the parsing of the earlyprintk= kernel arguments.
> 
> If you specify "earlyprintk=serial,ttyS0,115200" as a kernel argument,
> the "serial,ttyS" should be parsed as a single argument and not as
> "serial" and then "ttyS".
> 
> Also update the documentation to reflect you can specify the ttyS
> directly without the "serial" argument.
> 
> Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
> ---
>  Documentation/kernel-parameters.txt |    1 +
>  arch/x86/kernel/early_printk.c      |    5 ++++-
>  2 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 6fa7292..9107b38 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -671,6 +671,7 @@ and is between 256 and 4096 characters. It is defined in the file
>  	earlyprintk=	[X86,SH,BLACKFIN]
>  			earlyprintk=vga
>  			earlyprintk=serial[,ttySn[,baudrate]]
> +			earlyprintk=ttySn[,baudrate]
>  			earlyprintk=dbgp[debugController#]
>  
>  			Append ",keep" to not disable it when the real console
> diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
> index 2acfd3f..b7bfdd5 100644
> --- a/arch/x86/kernel/early_printk.c
> +++ b/arch/x86/kernel/early_printk.c
> @@ -201,8 +201,11 @@ static int __init setup_early_printk(char *buf)
>  
>  	while (*buf != '\0') {
>  		if (!strncmp(buf, "serial", 6)) {
> -			early_serial_init(buf + 6);
> +			buf += 6;
> +			early_serial_init(buf);
>  			early_console_register(&early_serial_console, keep);
> +			if (!strncmp(buf, ",ttyS", 5))
> +			    buf += 5;
>  		}

Looks good, beyond the tab-as-four-spaces ugliness which i fixed.

( and the 5/6 literals look a bit ugly too but are obvious and i dont 
  see a cleaner way to write them. )

Thanks,

	Ingo
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