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Date: Sun, 13 Apr 2008 10:45:36 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Nick Andrew <nick@nick-andrew.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [RFC] x86: Cleanup prose of Documentation/i386/IO-APIC.txt
Message-ID: <20080413084536.GB24429@elte.hu>
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* Nick Andrew <nick@nick-andrew.net> wrote:

> I'm doing a couple of cleanups to Documentation/i386/IO-APIC.txt
> and I have a problem with this line, which is supposed to compute
> a sample pirq= kernel parameter:
> 
>    echo -n pirq=; echo `scanpci | grep T_L | cut -c56-` | sed 's/ /,/g'
> 
> The 'scanpci' command used to be part of xutils and/or XFree86.
> Xorg implements "Xorg -scanpci" but the output is different and it won't
> run while X is running.
> 
> Firstly I propose using the $( ) construct rather than backticks, since
> it is easier to read:
> 
>    echo -n pirq=; echo $( scanpci | grep T_L | cut -c56- ) | sed 's/ /,/g'
> 
> Inside the backtics, instead of scanpci, I could do:
> 
>    lspci -v | grep IRQ | sed -e 's/.* IRQ \(\w\+\)/\1/'
> 
> Is this an acceptable substitution?

yeah, i guess so.

Btw., that's rather arcane text - do people still have to use pirq= boot 
lines to get their boxes to boot?

	Ingo