linux-kernel - Re: [PATCH 00/19] converting system calls to 64-bit time

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Message-ID: <1430984358.8171.28.camel@x220>
Date:	Thu, 07 May 2015 09:39:18 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	y2038@...ts.linaro.org, baolin.wang@...aro.org, tglx@...utronix.de,
	albert.aribaud@...ev.fr, john.stultz@...aro.org,
	bamvor.zhangjian@...aro.org, ruchandani.tina@...il.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	libc-alpha@...rceware.org
Subject: Re: [PATCH 00/19] converting system calls to 64-bit time_t, part 1

On Thu, 2015-05-07 at 09:27 +0200, Paul Bolle wrote:
> On Wed, 2015-05-06 at 18:30 +0200, Arnd Bergmann wrote:
> > * After all system calls are converted, we can change one architecture
> >   at a time to select ARCH_HAS_COMPAT_TIME, and modify its system
> >   call table accordingly. In this version, I do it for ARM32, x86-32,
> >   and x86-64 for demonstration purposes.
> 
> Perhaps this was correct for your first draft. Because this series adds
> ARCH_HAS_COMPAT_TIME in 04/19, but it doesn't add any selects of that
> symbol, does it? As far as I can see ARCH_HAS_COMPAT_TIME simply
> functions as an alias for COMPAT in this series.
> 
> > * A follow-up series changes over all other architectures.
> > 
> > * The last patch in the series changes the CONFIG_COMPAT_TIME
> >   Kconfig symbol to be user visible. Disabling this symbol will
> >   get you a kernel that intentionally breaks support for old tasks
> >   in order to provide an interface that will survive 2038.
> 
> This doesn't happen in 19/19, or in any other patch in this series.
> Maybe also something that has changed since the first draft.
> 
> >   This is meant mostly as a debugging help for now, to let people
> >   build a y2038 safe distro, but at some point in the 2030s, we
> >   should remove that option and all the compat handling.

And then it occurred to me to check the y2038-syscalls git branch you
referenced. After which the above made much more sense. (Though my
remark that ARCH_HAS_COMPAT_TIME simply functions as an alias for COMPAT
also seems to hold for that branch.)


Paul Bolle

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