linux-kernel - Re: [PATCH 05/18] blackfin/uaccess: fix sparse errors

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Date:	Thu, 18 Dec 2014 11:11:32 +0800
From:	Steven Miao <realmz6@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	"open list:CAN NETWORK DRIVERS <linux-can@...r.kernel.org>, open
	list:NETWORKING DRIVERS <netdev@...r.kernel.org>, open list" 
	<linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org,
	bfin <adi-buildroot-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 05/18] blackfin/uaccess: fix sparse errors

On Mon, Dec 15, 2014 at 12:52 AM, Michael S. Tsirkin <mst@...hat.com> wrote:
> virtio wants to read bitwise types from userspace using get_user.  At the
> moment this triggers sparse errors, since the value is passed through an
> integer.
>
> Fix that up using __force.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  arch/blackfin/include/asm/uaccess.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
> index 57701c3..6a46e7d 100644
> --- a/arch/blackfin/include/asm/uaccess.h
> +++ b/arch/blackfin/include/asm/uaccess.h
> @@ -147,7 +147,7 @@ static inline int bad_user_access_length(void)
>                 }                                               \
>         } else                                                  \
>                 _err = -EFAULT;                                 \
> -       x = (typeof(*(ptr)))_val;                               \
> +       x = (__force typeof(*(ptr)))_val;                               \
>         _err;                                                   \
>  })
>
> --
> MST
>
Acked-by: Steven Miao <realmz6@...il.com>
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