linux-kernel - Re: [PATCH 1/3] spi: Add helper functions for setting up transfers

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Message-ID: <50EE8FFD.2000000@metafoo.de>
Date:	Thu, 10 Jan 2013 10:55:09 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Julia Lawall <julia.lawall@...6.fr>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Jonathan Cameron <jic23@....ac.uk>,
	linux-iio@...r.kernel.org
Subject: Re: [PATCH 1/3] spi: Add helper functions for setting up transfers

On 01/10/2013 09:53 AM, Julia Lawall wrote:
>> +@r1@
>> +identifier fn;
>> +identifier xfers;
>> +@@
>> +fn(...)
>> +{
>> +	...
>> +(
>> +	struct spi_transfer xfers[...];
>> +|
>> +	struct spi_transfer xfers[];
>> +)
>> +	...
>> +}
> 
> Can it happen that there would be more than one spi_transfer or spi_message
> variable per function?  This semantic patch will only treat the case where
> there is only one, because the ... before an after the variable declaration
> won't match another declaration of the same form.
> 
> julia

I guess it could happen, but I would consider it to be very rare. There are
a few examples of multiple transfers in the kernel. But most of them look like

struct spi_message msg;
struct spi_transfer xfer_foo;
struct spi_transfer xfer_bar;

...
spi_message_add_tail(&xfer_foo, &msg);
spi_message_add_tail(&xfer_bar, &msg);

So the transformation can't be applied here anyway.

Do you have an idea how to change the rule to work with multiple
transfers/messages per function? If it would make the cocci file more
complex I wouldn't bother to take care of it, since it basically has no
practical use.

- Lars
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