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From: Artem Bityutskiy <dedekind1@gmail.com>
To: Greg KH <gregkh@suse.de>
Cc: anil_ravindranath@pmc-sierra.com, mchehab@redhat.com,
	benh@kernel.crashing.org, mac@melware.de, aacraid@adaptec.com,
	linux-mtd@lists.infradead.org, allan.stephens@windriver.com,
	hpa@zytor.com, t.sailer@alumni.ethz.ch, gwingerde@gmail.com,
	x86@kernel.org, elf@buici.com, cluster-devel@redhat.com,
	ccaulfie@redhat.com, mingo@redhat.com, dougthompson@xmission.com,
	dwmw2@infradead.org, linux-media@vger.kernel.org,
	jon.maloy@ericsson.com, arnaud.giersch@free.fr,
	linux-kbuild@vger.kernel.org, IvDoorn@gmail.com,
	teigland@redhat.com, tony.olech@elandigitalsystems.com,
	apw@canonical.com, linux-hams@vger.kernel.org,
	tglx@linutronix.de, swhiteho@redhat.com,
	linux-arm-kernel@lists.infradead.org, linux-edac@vger.kernel.org,
	Michal Marek <mmarek@suse.cz>,
	linux-scsi@vger.kernel.org, netdev@vger.kernel.org,
	linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org,
	linux-kernel@vger.ke
Subject: Re: [PATCH 00/34] Make kernel build deterministic
Date: Tue, 05 Apr 2011 22:24:07 +0300	[thread overview]
Message-ID: <1302031447.2608.41.camel@koala> (raw)
In-Reply-To: <20110405154918.GA31337@suse.de>

On Tue, 2011-04-05 at 08:49 -0700, Greg KH wrote:
> On Tue, Apr 05, 2011 at 04:58:47PM +0200, Michal Marek wrote:
> > 
> > Hi,
> > 
> > this series makes it possible to build bit-identical kernel image and
> > modules from identical sources. Of course the build is already
> > deterministic in terms of behavior of the code, but the various
> > timestamps embedded in the object files make it hard to compare two
> > builds, for instance to verify that a makefile cleanup didn't
> > accidentally change something. A prime example is /proc/config.gz, which
> > has both a timestamp in the gzip header and a timestamp in the payload
> > data. With this series applied, a script like this will produce
> > identical kernels each time:
> 
> Very nice stuff.  Do you want to take the individual patches through one
> of your trees, or do you mind if the subsystem maintainers take them
> through theirs?

But unfortunately, it is very easy to break this and for sure it'll be
broken very soon.

So additionally, I'd suggest:
1. Instrument checkpatch.pl and make it err or warn on timestamps.
2. Probably instrument linux-next to rise a warning when people break
   this.

-- 
Best Regards,
Artem Bityutskiy (Битюцкий Артём)


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2011-04-05 19:24 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-05 14:58 [PATCH 00/34] Make kernel build deterministic Michal Marek
2011-04-05 14:58 ` [PATCH 12/34] isdn/diva: Drop __TIME__ usage Michal Marek
2011-04-05 15:10   ` Armin Schindler
2011-04-05 15:37     ` Ben Hutchings
2011-04-05 16:07       ` Armin Schindler
2011-04-05 20:01         ` Sam Ravnborg
2011-04-05 19:17     ` Valdis.Kletnieks
2011-04-06  8:06       ` Michal Marek
2011-05-25 20:38     ` Michal Marek
2011-05-26  8:15       ` Armin Schindler
2011-05-26  8:29         ` Michal Marek
2011-04-05 14:59 ` [PATCH 15/34] baycom: " Michal Marek
     [not found]   ` <1302015780.4124.53.camel@xbox360.hq.axsem.com>
2011-05-25 15:23     ` Michal Marek
2011-04-05 14:59 ` [PATCH 17/34] hdlcdrv: " Michal Marek
2011-04-19 10:17   ` walter harms
2011-04-19 10:56     ` Michal Marek
     [not found]   ` <1302015790.4124.54.camel@xbox360.hq.axsem.com>
2011-05-25 15:24     ` Michal Marek
2011-04-05 14:59 ` [PATCH 18/34] wan/pc300: " Michal Marek
2011-05-25 20:43   ` Michal Marek
2011-05-25 20:44     ` David Miller
2011-04-05 14:59 ` [PATCH 19/34] rt2x00: " Michal Marek
2011-04-05 15:28   ` Gertjan van Wingerde
2011-04-05 18:37   ` Ivo Van Doorn
2011-04-05 14:59 ` [PATCH 28/34] atm: " Michal Marek
2011-05-25 20:49   ` Michal Marek
2011-05-25 21:39     ` David Miller
2011-04-05 14:59 ` [PATCH 29/34] tipc: " Michal Marek
2011-04-05 22:25   ` Paul Gortmaker
2011-04-05 15:49 ` [PATCH 00/34] Make kernel build deterministic Greg KH
2011-04-05 18:16   ` James Bottomley
2011-04-05 18:29     ` Mauro Carvalho Chehab
2011-04-05 18:44       ` Greg KH
2011-04-05 19:24   ` Artem Bityutskiy [this message]
2011-04-06  8:57     ` Ingo Molnar
2011-04-06  9:07     ` Michal Marek
2011-04-06  9:25       ` Artem Bityutskiy
2011-04-06  9:23   ` Michal Marek
2011-04-06  9:01 ` Ingo Molnar

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