linux-kernel - Re: IIO comments

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Message-Id: <201103161952.07486.arnd@arndb.de>
Date:	Wed, 16 Mar 2011 19:52:07 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Jonathan Cameron <jic23@....ac.uk>
Cc:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>
Subject: Re: IIO comments

On Wednesday 16 March 2011 17:54:55 Jonathan Cameron wrote:
> >> * iio_allocate_device() could get a size argument and
> >> allocate the dev_data together with the iio_dev in 
> >> a single allocation, like netdev_alloc does. In addition,
> >> you can pass a structure with all constant data, such
> >> as THIS_MODULE, and the operations and/or attribute groups,
> >> instead of having to set them individually for each dev.
> > Good idea.
>
> There is an issue here I'd forgotten.  Some of our structures have a
> elements which are cacheline aligned.  For first version of this I'll
> set our alignment requirements as L1_CACHE_BYTES.  Would be nice to be
> able to relax that down the line though as it means we use at least two
> cachelines even if we don't care about that alignment requirement.

I think the data used by a device structure is not really an issue,
especially extending it by just another cache line.

	Arnd
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