linux-kernel - Re: [PATCHv2] mmc:Add pointer cast to uintptr_t for slave_id_rx and tx in the function, sh_mmcif_request_dma

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Date:	Tue, 23 Jun 2015 17:07:24 -0700
From:	Joe Perches <joe@...ches.com>
To:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:	ulf.hansson@...aro.org, Nicholas Krause <xerofoify@...il.com>,
	ben.dooks@...ethink.co.uk, ykaneko0929@...il.com,
	laurent.pinchart+renesas@...asonboard.com,
	kouichi.tomita.yn@...esas.com, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] mmc:Add pointer cast to uintptr_t for slave_id_rx and
 tx in the function, sh_mmcif_request_dma_one

On Wed, 2015-06-24 at 08:54 +0900, Kuninori Morimoto wrote:
> Can you please teach us about status of this patch ?
> > This adds a cast to the variables,slave_id_rx and slave_id_rx
> > to uintptr_t before casting to void* in order to avoid build
> > warning on 64bit platforms for the function, sh_mmcif_request_dma_one.
[]
> > diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
[]
> > @@ -398,8 +398,8 @@ sh_mmcif_request_dma_one(struct sh_mmcif_host *host,
> >  
> >  	if (pdata)
> >  		slave_data = direction == DMA_MEM_TO_DEV ?
> > -			(void *)pdata->slave_id_tx :
> > -			(void *)pdata->slave_id_rx;
> > +			(void *)(uintptr_t)pdata->slave_id_tx :
> > +			(void *)(uintptr_t)pdata->slave_id_rx;

It's far more common (~10:1) in the kernel to cast using
	(<type> *)(unsigned long)<foo>
than
	(<type> *)(uintptr_t)<foo>

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