linux-kernel - Re: [PATCH 06/15] iio: sx9310: Align memory

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Message-ID: <CAHp75VfLYqPpO5M6GaHfSBBkQoZpnVTHFKVX5k9Pu_RjMO-whw@mail.gmail.com>
Date:   Tue, 28 Jul 2020 21:11:49 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Daniel Campello <campello@...omium.org>
Cc:     LKML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-iio <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 06/15] iio: sx9310: Align memory

On Tue, Jul 28, 2020 at 6:15 PM Daniel Campello <campello@...omium.org> wrote:
>
> Use __aligned(8) to ensure that the timestamp is correctly aligned
> when we call push_to_buffers
>
> Signed-off-by: Daniel Campello <campello@...omium.org>
> ---
>
>  drivers/iio/proximity/sx9310.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> index de52afd7c13333..fb5c16f2aa6b1a 100644
> --- a/drivers/iio/proximity/sx9310.c
> +++ b/drivers/iio/proximity/sx9310.c
> @@ -131,8 +131,8 @@ struct sx9310_data {
>          */
>         bool prox_stat[SX9310_NUM_CHANNELS];
>         bool trigger_enabled;
> -       __be16 buffer[SX9310_NUM_CHANNELS +
> -                     4]; /* 64-bit data + 64-bit timestamp */
> +       /* 64-bit data + 64-bit timestamp buffer */
> +       __be16 buffer[SX9310_NUM_CHANNELS + 4] __aligned(8);

If the data amount (channels) is always the same, please, use struct approach.
Otherwise put a comment explaining dynamic data.

-- 
With Best Regards,
Andy Shevchenko