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Re: [Regression] d96ac6f2: time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons

From: John Stultz <john dot stultz at linaro dot org>
To: Jens Taprogge <jens dot taprogge at taprogge dot org>
Cc: Kay Sievers <kay at vrfy dot org>, Feng Tang <feng dot tang at intel dot com>, Jason Gunthorpe <jgunthorpe at obsidianresearch dot com>, ThomasGleixner <tglx at linutronix dot de>, Greg Kroah-Hartman <gregkh at linuxfoundation dot org>, stable at vger dot kernel dot org, gcc at gcc dot gnu dot org
Date: Mon, 03 Jun 2013 11:07:50 -0700
Subject: Re: [Regression] d96ac6f2: time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons
References: <20130526192535 dot GA30367 at weetamoe dot luzern dot taprogge dot wh> <51A50AB7 dot 8000804 at linaro dot org> <20130529204119 dot GA3976 at weetamoe dot luzern dot taprogge dot wh> <51A6A682 dot 40303 at linaro dot org> <20130531010200 dot GA1385 at weetamoe dot luzern dot taprogge dot wh> <20130531120615 dot GA1442 at weetamoe dot luzern dot taprogge dot wh> <51A912C7 dot 8090500 at linaro dot org> <20130531234242 dot GA1235 at weetamoe dot luzern dot taprogge dot wh> <51A93D71 dot 30804 at linaro dot org> <20130601153705 dot GA1233 at weetamoe dot luzern dot taprogge dot wh> <20130601184519 dot GA2349 at weetamoe dot luzern dot taprogge dot wh>

On 06/01/2013 11:45 AM, Jens Taprogge wrote:

On Sat, Jun 01, 2013 at 05:37:05PM +0200, Jens Taprogge wrote:

On Fri, May 31, 2013 at 05:16:49PM -0700, John Stultz wrote:

On 05/31/2013 04:42 PM, Jens Taprogge wrote:

On Fri, May 31, 2013 at 02:14:47PM -0700, John Stultz wrote:


Ok. None of this is yet making any sense to me. (And I worry
enumerating all the mix and match of configs that work or don't only
blurs the issues).

Few base questions:
1) What distro is this on?

arch linux

2) What gcc version are you using?

gcc (GCC) 4.8.0 20130502 (prerelease)

(Sorry, I'm not very familiar with arch) Are you able to also
install a 4.7 gcc in parallel to try to build with?

If so, you might want to try that. Your results are just weird
enough I want to just be sure we're not chasing compiler caused
ghosts.

I will compile gcc4.6 and see if using that makes any difference.

I have compiled two of the broken configurations with gcc-4.6 and both
boot up.  I am not sure how to proceed from here.


Ok. That at least helps make me feel better that I'm not just crazy.

First thing, I'd probably file a bug against the Arch gcc 4.8 package,just in case there's any out-of-tree changes there.

I've also added the gcc mailing list to the thread to see if someonethere can help narrow down what might be going wrong.


thanks
-john

Follow-Ups:
- Re: [Regression] d96ac6f2: time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons
  - From: Jens Taprogge

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