linux-kernel - Re: [PATCH] [net-next] davinci_cpdma: don't cast dma_addr

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Message-ID: <20190710142637.GA5375@khorivan>
Date:   Wed, 10 Jul 2019 17:26:39 +0300
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Andrew Lunn <andrew@...n.ch>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [net-next] davinci_cpdma: don't cast dma_addr_t to
 pointer

On Wed, Jul 10, 2019 at 10:00:33AM +0200, Arnd Bergmann wrote:
>dma_addr_t may be 64-bit wide on 32-bit architectures, so it is not
>valid to cast between it and a pointer:
>
>drivers/net/ethernet/ti/davinci_cpdma.c: In function 'cpdma_chan_submit_si':
>drivers/net/ethernet/ti/davinci_cpdma.c:1047:12: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
>drivers/net/ethernet/ti/davinci_cpdma.c: In function 'cpdma_chan_idle_submit_mapped':
>drivers/net/ethernet/ti/davinci_cpdma.c:1114:12: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>drivers/net/ethernet/ti/davinci_cpdma.c: In function 'cpdma_chan_submit_mapped':
>drivers/net/ethernet/ti/davinci_cpdma.c:1164:12: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>
>Solve this by using two separate members in 'struct submit_info'.
>Since this avoids the use of the 'flag' member, the structure does
>not even grow in typical configurations.
>
>Fixes: 6670acacd59e ("net: ethernet: ti: davinci_cpdma: add dma mapped submit")
>Signed-off-by: Arnd Bergmann <arnd@...db.de>

Despite "flags" could be used for smth else (who knows), looks ok.
Reviewed-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

-- 
Regards,
Ivan Khoronzhuk