[Intel-wired-lan] [RFC PATCH] i40e: Build for 64-bit targets only

Ben Hutchings ben at decadent.org.uk
Wed Oct 4 02:24:53 UTC 2017

On Wed, Oct 04, 2017 at 02:52:08AM +0100, Ben Hutchings wrote:
> i40e now uses cmpxchg64(), which only works on a 64-bit (or non-SMP)
> system.  (It is currently defined for many 32-bit SMP configurations,
> but not correctly!)  It seems reasonable to expect that 40G hardware
> is not used on 32-bit systems.

Actually only mips seems to define it wrongly.  arm and x86 define
cmpcxhg64() in some 32-bit configurations (depending on required CPU
type).  There's not an obvious config symbol that could be used to
check for this specifically.


> Fixes: 841c950d67c6 ("i40e/i40evf: use cmpxchg64 when updating private ...")
> Signed-off-by: Ben Hutchings <ben at decadent.org.uk>
> ---
> I specifically found a build failure on 32-bit parisc:
> https://buildd.debian.org/status/fetch.php?pkg=linux&arch=hppa&ver=4.14%7Erc3-1%7Eexp1&stamp=1507045758&raw=0
> Ben.
>  drivers/net/ethernet/intel/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig
> index 1feb54b6d92e..dd17bdf5561e 100644
> --- a/drivers/net/ethernet/intel/Kconfig
> +++ b/drivers/net/ethernet/intel/Kconfig
> @@ -215,6 +215,7 @@ config I40E
>  	tristate "Intel(R) Ethernet Controller XL710 Family support"
>  	imply PTP_1588_CLOCK
>  	depends on PCI
> +	depends on 64BIT
>  	---help---
>  	  This driver supports Intel(R) Ethernet Controller XL710 Family of
>  	  devices.  For more information on how to identify your adapter, go

Ben Hutchings
One of the nice things about standards is that there are so many of them.
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