linux-kernel - Re: [PATCH] staging: fieldbus: anybuss: force address space conversion

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Date:   Tue, 21 May 2019 18:10:59 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: fieldbus: anybuss: force address space
 conversion

On Tue, May 21, 2019 at 10:51:16AM -0400, Sven Van Asbroeck wrote:
> The regmap's context (stored as 'void *') consists of a pointer to
> __iomem. Mixing __iomem and non-__iomem addresses generates
> sparse warnings.
> 
> Fix by using __force when converting to/from 'void __iomem *' and
> the regmap's context.
> 
> Signed-off-by: Sven Van Asbroeck <TheSven73@...il.com>
> ---
>  drivers/staging/fieldbus/anybuss/arcx-anybus.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/fieldbus/anybuss/arcx-anybus.c b/drivers/staging/fieldbus/anybuss/arcx-anybus.c
> index a167fb68e355..8126e5535ada 100644
> --- a/drivers/staging/fieldbus/anybuss/arcx-anybus.c
> +++ b/drivers/staging/fieldbus/anybuss/arcx-anybus.c
> @@ -114,7 +114,7 @@ static void export_reset_1(struct device *dev, bool assert)
>  static int read_reg_bus(void *context, unsigned int reg,
>  			unsigned int *val)
>  {
> -	void __iomem *base = context;
> +	void __iomem *base = (__force void __iomem *)context;


There is no need to use __force.  Just:

	void __iomem *base = (void __iomem *)context;

For the rest as well.

regards,
dan carpenter