linux-kernel - Re: [patch 3/3] x86: io-apic - code style cleaning for setup_IO_APIC

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Message-ID: <86802c440809061216n5bbad56amabf9934f8bf08d57@mail.gmail.com>
Date:	Sat, 6 Sep 2008 12:16:28 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Cyrill Gorcunov" <gorcunov@...il.com>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	"Ingo Molnar" <mingo@...e.hu>, hpa@...or.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [patch 3/3] x86: io-apic - code style cleaning for setup_IO_APIC_irqs

On Sat, Sep 6, 2008 at 12:04 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> [Maciej W. Rozycki - Sat, Sep 06, 2008 at 07:45:08PM +0100]
> | On Sat, 6 Sep 2008, Cyrill Gorcunov wrote:
> |
> | > Ingo, how about the following approach? We don't introduce new
> | > functions but rather srink the code by new printout form.
> |
> |  Honestly, this one should probably use sprintf() or suchlike to avoid the
> | mess of printk() calls building a line of output from pieces.  It's quite
> | easy to calculate here what the maximum size of the buffer required could
> | be and automatic arrays can have variable size, so no need for the hassle
> | of heap management.  Calls to printk() without a trailing newline should
> | be avoided where possible as it messes up logging priority if a message
> | pops up from an interrupt inbetween.
> |
> |   Maciej
> |
>
> The easiest way would be just print this info on separate
> lines like
>
>        IO-APIC (apicid-pin) 1-1 not connected
>
> and just drop all this troubles :)
>
> I'm not sure how much memory we need for every io-apic
> pins - iirc there only 32 redirection entry so it could
> be about 32 bytes from stack would be enough. Will take
> a look. Thanks Maciej! Ingo?

no. some system could have 3 or 4 ioapic controller, and every one
have 24...(like three mcp55/io55)
4*24

or old system have 1 8111 and 7 8132. will have 32 + 7*2*7

YH
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