netdev - Re: [PATCH net-next 0/2] gianfar: make local stats atomic64

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Message-Id: <20130213.131854.1897343233438268526.davem@davemloft.net>
Date:	Wed, 13 Feb 2013 13:18:54 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	paul.gortmaker@...driver.com
Cc:	netdev@...r.kernel.org, claudiu.manoil@...escale.com,
	eric.dumazet@...il.com
Subject: Re: [PATCH net-next 0/2] gianfar: make local stats atomic64

From: Paul Gortmaker <paul.gortmaker@...driver.com>
Date: Tue, 12 Feb 2013 19:24:22 -0500

> Eric noticed that the handling of local u64 ethtool counters for
> this driver commonly found on Freescale ppc-32 boards was racy.
> 
> However, before converting them over to atomic64_t, I noticed
> that an internal struct was being used to determine the offsets
> for exporting this data into the ethtool buffer, and in doing
> so, it assumed that the counters would always be u64.  Rather
> than keep this implicit assumption, a simple code cleanup gets
> rid of the struct completely, and leaves less conversion sites.
> 
> The alternative solution would have been to take advantage of
> the fact that the counters are all relating to error conditions,
> and hence make them internally u32.  In doing so, we'd be assuming
> that U32_MAX of any particular error condition is highly unlikely.
> This might have made sense if any increments were in a hot path.
> 
> Tested with "ethtool -S eth0" on sbc8548 board.
 ...
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux.git gfar-ethtool-atomic

Pulled, thanks Paul.
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