linux-kernel - Re: gart: factor out common code

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Message-ID: <ed10ee420804161955o221539f9p5cbfcc9eaf4b375d@mail.gmail.com>
Date:	Wed, 16 Apr 2008 19:55:52 -0700
From:	"SL Baur" <steve@...acs.org>
To:	"Pavel Machek" <pavel@....cz>
Cc:	"kernel list" <linux-kernel@...r.kernel.org>,
	"Andi Kleen" <andi@...stfloor.org>, "Ingo Molnar" <mingo@...e.hu>
Subject: Re: gart: factor out common code

On 4/16/08, Pavel Machek <pavel@....cz> wrote:
> On Tue 2008-04-15 16:25:29, SL Baur wrote:
>  > On 4/15/08, Pavel Machek <pavel@....cz> wrote:

>  > Other reviewer comments:
>  > The casting between struct pci_dev * and u64 is kind of ugly,
>  > I presume the reason for the narrowing casts in the block of
>  > code you moved is documented somewhere.
>
>
> Where am I doing that?

The struct pci_dev */u64 casting is in init_k8_gatt.  If Ingo is happy, then
forget my comment.  I don't have this kind of system to test the patch on, it
was just that as I was looking it over, all the casts kind of made my head
swim.

The narrowing cast is here:
+static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
+{
+       u32 tmp, ctl;
+
+        /* address of the mappings table */
+        addr >>= 12;
+        tmp = (u32) addr<<4;

Also, putting on my Andrew Morton cap, which I should have done before,
that function is too big to be inlined so you should probably drop the explicit
`inline' and let the compiler decide.

Add a
Reviewed-by: SL Baur <steve@...acs.org>
if that's appropriate.  I'm satisified that you did a one-for-one code move.

-sb
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