netdev - Re: [PATCH 5/5] net: sfc: avoid using timespec

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Message-ID: <alpine.DEB.2.11.1509300925420.4500@nanos>
Date:	Wed, 30 Sep 2015 09:26:01 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Arnd Bergmann <arnd@...db.de>
cc:	y2038@...ts.linaro.org, John Stultz <john.stultz@...aro.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rodolfo Giometti <giometti@...eenne.com>,
	linux-net-drivers@...arflare.com,
	Shradha Shah <sshah@...arflare.com>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH 5/5] net: sfc: avoid using timespec

On Mon, 28 Sep 2015, Arnd Bergmann wrote:

> The sfc driver internally uses a time format based on 32-bit (unsigned)
> seconds and 32-bit nanoseconds. This means it will overflow in 2106,
> but the value we pass into it is a signed 32-bit tv_sec that already
> overflows in 2038 to a negative value.
> 
> This patch changes the logic to use the lower 32 bits of the timespec64
> tv_sec in efx_ptp_ns_to_s_ns, which will have the correct value beyond the overflow.
> While this does not change any of the register values, it lets us
> keep using the driver after we deprecate the use of the timespec type
> in the kernel.
> 
> In the efx_ptp_process_times function, the change to use timespec64
> is similar, in that the tv_sec portion is ignored anyway and we only
> care about the nanosecond portion that remains unchanged.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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