From: Arnd Bergmann <a...@arndb.de>
Date: Thu, 28 May 2015 16:00:46 +0200

> The thunderx ethernet driver fails to build on architectures
> that do not have an atomic readq() and writeq() function for
> 64-bit PCI bus access:
> 
> drivers/net/ethernet/cavium/thunder/thunder_bgx.c: In function 'bgx_reg_read':
> include/asm-generic/io.h:195:23: error: implicit declaration of function 
> 'readq' [-Werror=implicit-function-declaration]
> 
> It seems impossible to get this driver to work on most 32-bit
> hardware, so it's better to add an explicit dependency, in
> order to let us keep building 'allmodconfig' kernels on
> all architectures.
> 
> As the driver is meant for the internal hardware on an arm64 SoC, this
> is not a problem for usability. Allowing the build on all 64-bit
> architectures rather than just CONFIG_ARM64 on the other hand means that
> we get the benefit of build testing on x86.
> 
> Signed-off-by: Arnd Bergmann <a...@arndb.de>

Applied, thanks Arnd.
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