linux-kernel - Re: [PATCH] pinctrl: artpec6: fix _

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Date:   Wed, 18 Dec 2019 17:32:36 +0000
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Jesper Nilsson <jesper.nilsson@...s.com>
Cc:     Jesper Nilsson <jespern@...s.com>, Lars Persson <larper@...s.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...s.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: artpec6: fix __iomem on reg in set

On 18/12/2019 16:26, Jesper Nilsson wrote:
> On Wed, Dec 18, 2019 at 11:16:02AM +0100, Ben Dooks (Codethink) wrote:
>> The artpec6_pconf_set should have marked reg as __iomem,
>>   which ends up making sparse complain about address
>> space conversions. Add the __iomem to silence the
>> following warnings:
>>
>> drivers/pinctrl/pinctrl-artpec6.c:814:13: warning: incorrect type in assignment (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:814:13:    expected unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:814:13:    got void [noderef] <asn:2> *
>> drivers/pinctrl/pinctrl-artpec6.c:825:34: warning: incorrect type in argument 1 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:825:34:    expected void const volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:825:34:    got unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:827:25: warning: incorrect type in argument 2 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:827:25:    expected void volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:827:25:    got unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:837:34: warning: incorrect type in argument 1 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:837:34:    expected void const volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:837:34:    got unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:840:25: warning: incorrect type in argument 2 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:840:25:    expected void volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:840:25:    got unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:850:34: warning: incorrect type in argument 1 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:850:34:    expected void const volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:850:34:    got unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:853:25: warning: incorrect type in argument 2 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:853:25:    expected void volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:853:25:    got unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:864:34: warning: incorrect type in argument 1 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:864:34:    expected void const volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:864:34:    got unsigned int *reg
>> drivers/pinctrl/pinctrl-artpec6.c:867:25: warning: incorrect type in argument 2 (different address spaces)
>> drivers/pinctrl/pinctrl-artpec6.c:867:25:    expected void volatile [noderef] <asn:2> *addr
>> drivers/pinctrl/pinctrl-artpec6.c:867:25:    got unsigned int *reg
>>
>> Signed-off-by: Ben Dooks (Codethink) <ben.dooks@...ethink.co.uk>
>> ---
> 
> 
> 
> 
>> Cc: Lars Persson <lars.persson@...s.com>
>> Cc: Linus Walleij <linus.walleij@...aro.org>
>> Cc: linux-arm-kernel@...s.com
>> Cc: linux-gpio@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> ---
>>   drivers/pinctrl/pinctrl-artpec6.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/pinctrl/pinctrl-artpec6.c b/drivers/pinctrl/pinctrl-artpec6.c
>> index 986e04ac6b5b..439a997b6bdb 100644
>> --- a/drivers/pinctrl/pinctrl-artpec6.c
>> +++ b/drivers/pinctrl/pinctrl-artpec6.c
>> @@ -798,7 +798,7 @@ static int artpec6_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
>>   	enum pin_config_param param;
>>   	unsigned int arg;
>>   	unsigned int regval;
>> -	unsigned int *reg;
>> +	unsigned int __iomem *reg;
> 
> 	void __iomem *reg;
> 
> We're using as an argument to readl()?

yes, readl() shoud take an __iomem attributed pointer.

>>   	int i;
>>   
>>   	/* Check for valid pin */
>> -- 
>> 2.24.0
>>
> 
> /^JN - Jesper Nilsson
> 


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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