linux-kernel - Re: [PATCH v3] mtd: test: Replace timeval with ktime

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Message-ID: <4170676.z5yoWA4Rtc@wuerfel>
Date:	Thu, 18 Dec 2014 08:53:10 +0100
From:	Arnd Bergmann <arnd@...aro.org>
To:	Chunyan Zhang <zhang.chunyan@...aro.org>
Cc:	dwmw2@...radead.org, computersforpeace@...il.com,
	john.stultz@...aro.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org, zhang.lyra@...il.com
Subject: Re: [PATCH v3] mtd: test: Replace timeval with ktime_t in speedtest.c and torturetest.c

On Thursday 18 December 2014 11:23:31 Chunyan Zhang wrote:
> This patch changes the 32-bit time type (timeval) to the 64-bit one
> (ktime_t), since 32-bit time types will break in the year 2038.
> 
> I use ktime_t instead of timeval to define 'start' and 'finish'
> which are used to get the time for tow points.
> 
> This patch also changes do_gettimeofday() to ktime_get() accordingly,
> since ktime_get returns a ktime_t, but do_gettimeofday returns a
> struct timeval, and the other reason is that ktime_get() uses
> the monotonic clock.
> 
> This patch is based on another patch which privides a millisecond
> time difference function 'ktime_ms_delta' in ktime.h
> 
> http://lkml.iu.edu//hypermail/linux/kernel/1412.2/00625.html
> 
> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> 

The new version still looks good to me, but as there is now a
dependency on another patch, I'd suggest we queue this up in the
y2038 branch together with the patch that introduces ktime_ms_delta.

David or Brian, can you provide an Ack for this, or do you have
any objections?

	Arnd
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