linux-kernel - Re: [PATCH 2/2] ARM: iop: don't use using 64-bit DMA masks

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Date:   Sun, 7 Apr 2019 15:20:12 -0700
From:   Olof Johansson <olof@...om.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>, arm@...nel.org,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: iop: don't use using 64-bit DMA masks

On Mon, Mar 25, 2019 at 04:50:43PM +0100, Arnd Bergmann wrote:
> clang warns about statically defined DMA masks from the DMA_BIT_MASK
> macro with length 64:
> 
>  arch/arm/mach-iop13xx/setup.c:303:35: error: shift count >= width of type [-Werror,-Wshift-count-overflow]
>  static u64 iop13xx_adma_dmamask = DMA_BIT_MASK(64);
>                                   ^~~~~~~~~~~~~~~~
>  include/linux/dma-mapping.h:141:54: note: expanded from macro 'DMA_BIT_MASK'
>  #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
>                                                       ^ ~~~
> 
> The ones in iop shouldn't really be 64 bit masks, so changing them
> to what the driver can support avoids the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>


Applied to fixes.


-Olof