linux-kernel - Re: [PATCH 03/16] dma-debug: add hash functions for dma_debug

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Message-ID: <20090109175542.GB30168@ioremap.net>
Date:	Fri, 9 Jan 2009 20:55:42 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	dwmw2@...radead.org, fujita.tomonori@....ntt.co.jp,
	netdev@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 03/16] dma-debug: add hash functions for dma_debug_entries

Hi Joerg.

On Fri, Jan 09, 2009 at 05:19:17PM +0100, Joerg Roedel (joerg.roedel@....com) wrote:
> +/*
> + * Request exclusive access to a hash bucket for a given dma_debug_entry.
> + */
> +static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
> +					   unsigned long *flags)
> +{
> +	int idx = hash_fn(entry);
> +	unsigned long __flags;
> +
> +	spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
> +	*flags = __flags;
> +	return &dma_entry_hash[idx];
> +}
> +
> +/*
> + * Give up exclusive access to the hash bucket
> + */
> +static void put_hash_bucket(struct hash_bucket *bucket,
> +			    unsigned long *flags)
> +{
> +	unsigned long __flags = *flags;
> +
> +	spin_unlock_irqrestore(&bucket->lock, __flags);
> +}

Why do you need such ugly helpers?

> + * Add an entry to a hash bucket
> + */
> +static void hash_bucket_add(struct hash_bucket *bucket,
> +			    struct dma_debug_entry *entry)
> +{
> +	list_add_tail(&entry->list, &bucket->list);
> +}

> +/*
> + * Remove entry from a hash bucket list
> + */
> +static void hash_bucket_del(struct dma_debug_entry *entry)
> +{
> +	list_del(&entry->list);
> +}

Do you really need this getting they are called only from single place?

-- 
	Evgeniy Polyakov
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