linux-kernel - Re: [PATCH 03/18] dma-debug: add hash functions for dma_debug

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Message-ID: <20090306195456.GF6966@amd.com>
Date:	Fri, 6 Mar 2009 20:54:56 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 03/18] dma-debug: add hash functions for dma_debug_entries

On Fri, Mar 06, 2009 at 10:38:23PM +0300, Cyrill Gorcunov wrote:
> [Joerg Roedel - Fri, Mar 06, 2009 at 08:25:35PM +0100]
> ...
> | > Nod :) The only problem could be (it depends) -- is that
> | > if one day some locking would be needed instead of fixing
> | > one function you would need to grep all list_add/del entries :)
> | 
> | The access is already locked. And as the functions are only called
> | once each gcc should inline them automatically. At least gcc inlined
> | them in my kernels :)
> | 
> | 	Joerg
> 
> I didn't checked the precise code logic neither details, just wanted
> to point out that 'wrapping' functions are beneficial sometimes (especially
> when they hide details of internal data and provide some kind of interface
> to play with).

True. I agree with this. These functions improve the readability of the
code imho.

> Dunno Joerg, I think it would be better to point out that we want
> those functions being inlined by gcc 'inline' attribute explicitly.
> But you choose :)

Yeah, I think its better to let gcc choose what to inline and what not.
It has a good heuristic for that task :)

	Joerg


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