linux-kernel - RE: [PATCH] pinctrl: fix a discarded-qualifiers build error

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Date:   Tue, 25 Jan 2022 22:17:38 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Miles Chen' <miles.chen@...iatek.com>,
        Lakshmi Sowjanya D <lakshmi.sowjanya.d@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Kiran Kumar S <kiran.kumar1.s@...el.com>
CC:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>
Subject: RE: [PATCH] pinctrl: fix a discarded-qualifiers build error

From: Miles Chen
> Sent: 25 January 2022 17:55
> 
> Fix COMPILER=gcc ARCH=arm64 DEFCONFIG=allyesconfig build:
> 
> log:
> drivers/pinctrl/pinctrl-thunderbay.c:815:29: error: assignment discards
> 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> 
> Fixes: 12422af8194d ("pinctrl: Add Intel Thunder Bay pinctrl driver")
> Signed-off-by: Miles Chen <miles.chen@...iatek.com>
> ---
>  drivers/pinctrl/pinctrl-thunderbay.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-thunderbay.c b/drivers/pinctrl/pinctrl-thunderbay.c
> index b5b47f4dd774..4e6d718c03fc 100644
> --- a/drivers/pinctrl/pinctrl-thunderbay.c
> +++ b/drivers/pinctrl/pinctrl-thunderbay.c
> @@ -812,7 +812,7 @@ static int thunderbay_add_functions(struct thunderbay_pinctrl *tpc, struct funct
>  				}
>  			}
> 
> -			grp = func->group_names;
> +			grp = (const char **)func->group_names;

You should change the type of 'grp' not add a cast.
The compiler can warn about casts removing 'const' as well.

	David

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