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

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Date:   Wed, 16 Jan 2019 09:39:37 -0800
From:   Joe Perches <joe@...ches.com>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
        gregkh@...uxfoundation.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, Vincent Whitchurch <rabinv@...s.com>
Subject: Re: [PATCH 2/8] vop: Cast pointers to uintptr_t

On Wed, 2019-01-16 at 17:32 +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]
[]
> diff --git 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;

trivia:

unsigned long is more commonly used in the kernel for
these casts.