linux-kernel - Re: [PATCH] drivers: gpio: use of_match_ptr() and ACPI

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Date:   Tue, 17 Nov 2020 16:54:01 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     "Enrico Weigelt, metux IT consult" <info@...ux.net>
Cc:     linux-kernel@...r.kernel.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, andrew@...id.au, albeu@...e.fr,
        f.fainelli@...il.com, sbranden@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com,
        Eugeniy.Paltsev@...opsys.com, hoan@...amperecomputing.com,
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        u.kleine-koenig@...gutronix.de, lee.jones@...aro.org,
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        ssantosh@...nel.org, khilman@...nel.org,
        manivannan.sadhasivam@...aro.org, p.zabel@...gutronix.de,
        linux-gpio@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH] drivers: gpio: use of_match_ptr() and ACPI_PTR() macros

On Tue, Nov 17, 2020 at 04:43:40PM +0100, Enrico Weigelt, metux IT consult wrote:
> The of_match_ptr(foo) macro evaluates to foo, only if
> CONFIG_OF is set, otherwise to NULL. Same does ACPI_PTR with
> CONFIG_ACPI. That's very helpful for drivers that can be used
> with or without oftree / acpi.
> 
> Even though most of the drivers touched here probably don't
> actually need that, it's also nice for consistency to make it
> the de-facto standard and change all drivers to use the
> of_match_ptr() and ACPI_PTR() macros.
> 
> A nice side effect: in some situations, when compiled w/o
> CONFIG_OF/CONFIG_ACPI, the corresponding match tables could
> automatically become unreferenced and optimized-away by the
> compiler, w/o explicitly cluttering the code w/ ifdef's.

Isn't this going to cause a lot of "defined but unused" warnings when
built without OF support, for example?

Thierry

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