linux-kernel - Re: [Broken] PCI: clean up resource alignment management

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Message-ID: <alpine.LFD.1.10.0804221510420.2779@woody.linux-foundation.org>
Date:	Tue, 22 Apr 2008 15:13:47 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
cc:	Jeff Chua <jeff.chua.linux@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Greg KH <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Broken] PCI: clean up resource alignment management



On Tue, 22 Apr 2008, Linus Torvalds wrote:
> 
> (In fact, I think cardbus bridges have a much more flexible alignment than 
> that size thing, and can be aligned at finer granularity, but I forget the 
> exact details, and since we didn't add a special "alignment" field, we 
> can't take advantage of it anyway).

Yeah, I double-checked: the IO alignment is 4 bytes, the MEM alignment is 
4k.

So if we had a separate alignment word we could use that, but in the 
meantime I think IORESOURCE_SIZEALIGN is good enough, and a bit more 
readable than the STARTALIGN thing.

Now we just need to have somebody test it. It turns out that I no longer 
have any Cardbus cards, since my laptops now all have built-in wireless. 
Boo hiss for me.

			Linus
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