linux-kernel - Re: aperture_64.c: clarify that too small aperture is valid reason for this code

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Message-ID: <20081128143346.GF28138@elte.hu>
Date:	Fri, 28 Nov 2008 15:33:46 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pavel Machek <pavel@...e.cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: aperture_64.c: clarify that too small aperture is valid reason
	for this code


* Pavel Machek <pavel@...e.cz> wrote:

> Clarify that too small aperture is valid reason for this code.
> 
> Signed-off-by: Pavel Machek <pavel@...e.cz>
> 
> diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
> index 9a32b37..026fcfb 100644
> --- a/arch/x86/kernel/aperture_64.c
> +++ b/arch/x86/kernel/aperture_64.c
> @@ -1,8 +1,9 @@
>  /*
>   * Firmware replacement code.
>   *
> - * Work around broken BIOSes that don't set an aperture or only set the
> - * aperture in the AGP bridge.
> + * Work around broken BIOSes that don't set an aperture, only set the
> + * aperture in the AGP bridge, or set too small aperture.
> + *

applied to tip/x86/iommu, thanks Pavel!

That comment is indeed highly misleading - and sets the wrong mindset for 
people who start reading this file. The list you add it to are indeed the 
most common reasons for us to (re-)allocate the aperture.

Would you be interested in sending a patch for a full list of situations 
where we declare the existing aperture invalid and reallocate it? It will 
certainly help understanding the purpose and role of this file.

	Ingo
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