linux-kernel - Re: thermal/drivers/hisi: Remove bogus const from function return type

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Date:   Mon, 1 Jan 2018 10:21:26 -0800
From:   Eduardo Valentin <edubezval@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Kevin Wangtao <kevin.wangtao@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: thermal/drivers/hisi: Remove bogus const from function return
 type

Hello Geert,

On Sun, Nov 19, 2017 at 12:04:27PM +0100, Geert Uytterhoeven wrote:
> With gcc-4.1.2:
> 
>     drivers/thermal/hisi_thermal.c: In function ‘hisi_thermal_probe’:
>     drivers/thermal/hisi_thermal.c:530: warning: type qualifiers ignored on function return type
> 
> Remove the "const" keyword to fix this.

Interesting.

I intentionally asked Daniel to include the modifier because sparse
pointed this to me:

This patch adds this issue to hisi driver (sparse)

drivers/thermal/hisi_thermal.c:398:24: warning: incorrect type in assignment (different modifiers)
drivers/thermal/hisi_thermal.c:398:24:    expected int ( *platform_probe )( ... )
drivers/thermal/hisi_thermal.c:398:24:    got void const *

which makes sense to me to be const, given that it is receiving the return 
of a function which returns a const void *. 
nclude/linux/of_device.h:extern const void *of_device_get_match_data(const struct device *dev);

Cheers,