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net: thunderx: add 64-bit dependency

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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 <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2015-05-28 16:00:46 +02:00 committed by David S. Miller
parent d9dca9cb26
commit 5e9615bfb9
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/cavium/Kconfig
View File

@ -4,7 +4,7 @@
config NET_VENDOR_CAVIUM
tristate "Cavium ethernet drivers"
depends on PCI
depends on PCI && 64BIT
---help---
Enable support for the Cavium ThunderX Network Interface
Controller (NIC). The NIC provides the controller and DMA