Subject: Re: Fwd: Patch to control VGA bus routing and active VGA device.
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Grant Grundler <grundler@parisc-linux.org>, Jesse Barnes <jbarnes@sgi.com>,
       Jon Smirl <jonsmirl@gmail.com>, Greg KH <greg@kroah.com>,
       Russell King <rmk+lkml@arm.linux.org.uk>,
       Jeff Garzik <jgarzik@pobox.com>, linux-pci@atrey.karlin.mff.cuni.cz,
       lkml <linux-kernel@vger.kernel.org>,
       Russell King <rmk@arm.linux.org.uk>
In-Reply-To: <20050128200010.GJ28246@parcelfarce.linux.theplanet.co.uk>
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	 <200501270828.43879.jbarnes@sgi.com>
	 <20050128173222.GC30791@colo.lackof.org>
	 <200501281041.42016.jbarnes@sgi.com>
	 <20050128193320.GB32135@colo.lackof.org>
	 <20050128200010.GJ28246@parcelfarce.linux.theplanet.co.uk>
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On Gwe, 2005-01-28 at 20:00, Matthew Wilcox wrote:
> Possibly a better solution (less likely to break things) would be to allow
> drivers to reserve the 10-bit aliases too.  Something like this:
> 
> static inline void request_isa_alias_regions(unsigned long start,
>                 unsigned long n, const char *name)
> {
>         int base;
>         for (base = 0x400; base < 0x10000; base += 0x400) {
>                 request_region(base + start, n, name);
>         }
> }
> 
> and then call that in drivers/video/console/vgacon.c

Almost every x86 I/O device in ISA space has this problem so it would be
better if request_region learned to take a decode mask instead of adding
another 500 entries

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