linux-kernel - Re: [PATCH 07/10] x86: add checks for alloc/free

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Message-ID: <20081122093815.GH29705@8bytes.org>
Date:	Sat, 22 Nov 2008 10:38:15 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	joerg.roedel@....com, netdev@...r.kernel.org, tglx@...utronix.de,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 07/10] x86: add checks for alloc/free_coherent code

On Sat, Nov 22, 2008 at 12:27:42PM +0900, FUJITA Tomonori wrote:
> On Fri, 21 Nov 2008 17:26:07 +0100
> Joerg Roedel <joerg.roedel@....com> wrote:
> > +void debug_alloc_coherent(struct device *dev, size_t size,
> > +			  dma_addr_t dma_addr, void *virt)
> > +{
> > +	unsigned long flags;
> > +	struct dma_debug_entry *entry;
> > +
> > +	if (dma_addr == bad_dma_address)
> > +		return;
> > +
> > +	entry = dma_entry_alloc();
> > +	if (!entry)
> > +		return;
> > +
> > +	entry->type      = DMA_DEBUG_COHERENT;
> > +	entry->dev       = dev;
> > +	entry->cpu_addr  = virt;
> > +	entry->size      = size;
> > +	entry->dev_addr  = dma_addr;
> > +	entry->direction = DMA_BIDIRECTIONAL;
> > +
> > +	spin_lock_irqsave(&dma_lock, flags);
> > +	add_dma_entry(entry);
> > +	spin_unlock_irqrestore(&dma_lock, flags);
> > +}
> > +EXPORT_SYMBOL(debug_alloc_coherent);
> 
> Can you clean up the duplication in debug_map_single, debug_map_sg,
> and debug_alloc_coherent? The higher-level helper functions might
> help.

Hmm, lets see. For me it makes only sense if it won't result in helper
functions with tons of parameters. This is worse than little code
duplication. But lets see.

Joerg

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