linux-kernel - Re: [PATCH 2/8] vop: Cast pointers to uintptr

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Date:   Tue, 22 Jan 2019 11:41:29 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com, arnd@...db.de,
        linux-kernel@...r.kernel.org, Vincent Whitchurch <rabinv@...s.com>
Subject: Re: [PATCH 2/8] vop: Cast pointers to uintptr_t

On Wed, Jan 16, 2019 at 05:32:47PM +0100, Vincent Whitchurch wrote:
> Fix these on 32-bit:
> 
>  vop_vringh.c:711:13: error: cast from pointer to integer of different
>  size [-Werror=pointer-to-int-cast]
> 
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> ---
>  drivers/misc/mic/vop/vop_main.c   | 8 ++++----
>  drivers/misc/mic/vop/vop_vringh.c | 4 ++--
>  2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/misc/mic/vop/vop_main.c b/drivers/misc/mic/vop/vop_main.c
> index 6b212c8b78e7..5a366cf68d95 100644
> --- a/drivers/misc/mic/vop/vop_main.c
> +++ b/drivers/misc/mic/vop/vop_main.c
> @@ -497,7 +497,7 @@ static int _vop_add_device(struct mic_device_desc __iomem *d,
>  	vdev->desc = d;
>  	vdev->dc = (void __iomem *)d + _vop_aligned_desc_size(d);
>  	vdev->dnode = dnode;
> -	vdev->vdev.priv = (void *)(u64)dnode;
> +	vdev->vdev.priv = (void *)(uintptr_t)dnode;

As Joe said, use "unsigned long".  uintptr_t is a userspace type, not a
kernel type.

thanks,

greg k-h