linux-kernel - Re: [PATCH v8 1/3] devres: provide devm

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Date:   Fri, 21 Aug 2020 11:15:55 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Michal Simek <michal.simek@...inx.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>, linux-iio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v8 1/3] devres: provide devm_krealloc()

On Thu, Aug 20, 2020 at 08:51:08PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Implement the managed variant of krealloc(). This function works with
> all memory allocated by devm_kmalloc() (or devres functions using it
> implicitly like devm_kmemdup(), devm_kstrdup() etc.).
> 
> Managed realloc'ed chunks can be manually released with devm_kfree().
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

...

> +static struct devres *to_devres(void *data)
> +{
> +	return data - ALIGN(sizeof(struct devres), ARCH_KMALLOC_MINALIGN);
> +}
> +
> +static size_t devres_data_size(size_t total_size)
> +{
> +	return total_size - ALIGN(sizeof(struct devres), ARCH_KMALLOC_MINALIGN);
> +}

I'm fine with above, but here is a side note, perhaps

	offsetof(struct devres,	data)

will be more practical (no duplication of alignment and hence slightly better
maintenance)? (Note, I didn't check if it provides the correct result)

Another side note: do we have existing users of these helpers?

-- 
With Best Regards,
Andy Shevchenko