linux-kernel - Re: [PATCH] spi: stm32: update dev_dbg() print format for SPI params

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Date:   Mon, 4 Jan 2021 15:50:44 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     linux-spi <linux-spi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] spi: stm32: update dev_dbg() print format for SPI params

On Mon, Jan 4, 2021 at 10:55 AM Alexandru Ardelean
<alexandru.ardelean@...log.com> wrote:
>
> With the introduction of the 'include/uapi/linux/spi/spi.h' header, the
> type of the macros are enforced to 'unsigned long int' via the _BITUL()
> macro.
>
> This causes some -Wformat warnings in the spi-stm32 driver.
> This patch changes the printf() specifiers from '%d' to '%lu' to
> accommodate for this change.
>
> Fixes: f7005142dace ("spi: uapi: unify SPI modes into a single spi.h header")
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>

LKP also reported this before.

...

> -       dev_dbg(spi->dev, "cpol=%d cpha=%d lsb_first=%d cs_high=%d\n",
> +       dev_dbg(spi->dev, "cpol=%lu cpha=%lu lsb_first=%lu cs_high=%lu\n",
>                 spi_dev->mode & SPI_CPOL,
>                 spi_dev->mode & SPI_CPHA,
>                 spi_dev->mode & SPI_LSB_FIRST,

Wouldn't the output be a bit awful with all these?

I think the proper fix is to add !! to each bit mask.

-- 
With Best Regards,
Andy Shevchenko