linux-kernel - Re: [PATCH v2 09/15] spi: Use struct

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Message-ID: <20230710-doze-scared-9f0a2e1a9125-mkl@pengutronix.de>
Date:   Mon, 10 Jul 2023 17:59:55 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
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        Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
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        Uwe Kleine-König 
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Subject: Re: [PATCH v2 09/15] spi: Use struct_size() helper

On 10.07.2023 18:49:26, Andy Shevchenko wrote:
> Prefer struct_size() over open-coded versions.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  include/linux/spi/spi.h | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
> index c9479badf38c..9fb8efb068c6 100644
> --- a/include/linux/spi/spi.h
> +++ b/include/linux/spi/spi.h
> @@ -17,6 +17,7 @@
>  #include <linux/minmax.h>
>  #include <linux/mod_devicetable.h>
>  #include <linux/mutex.h>
> +#include <linux/overflow.h>
>  #include <linux/scatterlist.h>
>  #include <linux/slab.h>
>  #include <linux/smp.h>
> @@ -1095,6 +1096,8 @@ struct spi_transfer {
>   * @state: for use by whichever driver currently owns the message
>   * @resources: for resource management when the spi message is processed
>   * @prepared: spi_prepare_message was called for the this message
> + * @t: for use with spi_message_alloc() when message and transfers have
> + *	been allocated together
>   *
>   * A @spi_message is used to execute an atomic sequence of data transfers,
>   * each represented by a struct spi_transfer.  The sequence is "atomic"
> @@ -1147,6 +1150,9 @@ struct spi_message {
>  
>  	/* List of spi_res reources when the spi message is processed */
>  	struct list_head        resources;
> +
> +	/* For embedding transfers into the memory of the message */
> +	struct spi_transfer	t[];

You might want to use the DECLARE_FLEX_ARRAY helper here.

Marc

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