linux-kernel - Re: [PATCH] mlxsw: fix warnings for big-endian 32-bit dma_addr

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Message-ID: <1444200782.26237.8.camel@perches.com>
Date:	Tue, 06 Oct 2015 23:53:02 -0700
From:	Joe Perches <joe@...ches.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Jiri Pirko <jiri@...lanox.com>,
	Ido Schimmel <idosch@...lanox.com>,
	linux-kernel@...r.kernel.org, Elad Raz <eladr@...lanox.com>,
	Scott Feldman <sfeldma@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] mlxsw: fix warnings for big-endian 32-bit dma_addr_t

On Tue, 2015-10-06 at 23:47 +0200, Arnd Bergmann wrote:
> The recently added mlxsw driver produces warnings in ARM
> allmodconfig:
> 
> drivers/net/ethernet/mellanox/mlxsw/pci.c: In function 'mlxsw_pci_cmd_exec':
> drivers/net/ethernet/mellanox/mlxsw/pci.c:1585:59: warning: right shift count >= width of type [-Wshift-count-overflow]
> linux/byteorder/big_endian.h:38:51: note: in definition of macro '__cpu_to_be32'
> drivers/net/ethernet/mellanox/mlxsw/pci.c:76:2: note: in expansion of macro 'iowrite32be'
> 
> This changes the type of the local variable to u64, which gets rid of the
> warning and seems nicer than adding #ifdefs.

Using upper_32_bits instead of the shift might be
nicer than changing the type.


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