netdev - Re: [PATCH net-next] marvell: mark mvneta and mvpp2 32-bit only

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Date:   Tue, 22 Nov 2016 16:13:40 +0100
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Marcin Wojtas <mw@...ihalf.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] marvell: mark mvneta and mvpp2 32-bit only

Hi Arnd,
 
 On mar., nov. 22 2016, Arnd Bergmann <arnd@...db.de> wrote:

> Both of these drivers won't work on 64-bit architectures unless they
> are redesigned, since they store a virtual address pointer in a 32-bit
> field of the descriptors:
>
> drivers/net/ethernet/marvell/mvneta_bm.c: In function 'mvneta_bm_construct':
> drivers/net/ethernet/marvell/mvneta_bm.c:103:16: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> drivers/net/ethernet/marvell/mvpp2.c: In function 'mvpp2_prs_vlan_init':
> drivers/net/ethernet/marvell/mvpp2.c:2563:32: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
>
> This limits the COMPILE_TEST option for the two drivers again to
> only build them on 32-bit. This seems nicer than shutting up the
> warnings, in case we ever actually want to use them on 64-bit,
> as the warnings indicate which parts of the driver are currently

Actually we are using these drivers on 64-bits so obviously there are
not 32 bits only!

For mvneta currently we do not use BM on the 64-bits version. I agree
that there is a problem with mvneta_bm.c when building in 64-bits but it
should not prevent us to use the mvneta driver.

Gregory

> broken there.
>
> Fixes: a0627f776a45 ("net: marvell: Allow drivers to be built with COMPILE_TEST")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/net/ethernet/marvell/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/ethernet/marvell/Kconfig b/drivers/net/ethernet/marvell/Kconfig
> index d74d4e6f0b34..66fd9dbb2ca7 100644
> --- a/drivers/net/ethernet/marvell/Kconfig
> +++ b/drivers/net/ethernet/marvell/Kconfig
> @@ -58,6 +58,7 @@ config MVNETA
>  	tristate "Marvell Armada 370/38x/XP network interface support"
>  	depends on PLAT_ORION || COMPILE_TEST
>  	depends on HAS_DMA
> +	depends on !64BIT
>  	select MVMDIO
>  	select FIXED_PHY
>  	---help---
> @@ -81,6 +82,7 @@ config MVPP2
>  	tristate "Marvell Armada 375 network interface support"
>  	depends on MACH_ARMADA_375 || COMPILE_TEST
>  	depends on HAS_DMA
> +	depends on !64BIT
>  	select MVMDIO
>  	---help---
>  	  This driver supports the network interface units in the
> -- 
> 2.9.0
>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com