linux-kernel - Re: Forward port of latest RT patch (2.6.21.5-rt20) to 2.6.22 available

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Message-ID: <20070712163341.GA9622@elte.hu>
Date:	Thu, 12 Jul 2007 18:33:41 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	jim.houston@...r.com, joe.korty@...r.com, rostedt@...dmis.org,
	tglx@...utronix.de, dwalker@...sta.com,
	David Bahi <DBahi@...ell.com>,
	Moiz Kohari <MKohari@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>, dsaxena@...xity.net,
	williams@...hat.com, abogani@...ware.it,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: Forward port of latest RT patch (2.6.21.5-rt20) to 2.6.22
	available


* Gregory Haskins <ghaskins@...ell.com> wrote:

>   For the most part, it seems you guys have resolved most of the 
> issues that we ran into as well (e.g. early-flush-tlb, relocated 
> die-notifier, etc, come to mind).  I found one patch that was missing 
> that allows debug configurations to build properly.  Heres that patch:
> 
> --- linux-2.6.21.orig/kernel/latency_trace.c
> +++ linux-2.6.21/kernel/latency_trace.c
> @@ -24,6 +24,7 @@
>  #include <linux/utsrelease.h>
>  #include <asm/uaccess.h>
>  #include <asm/unistd.h>
> +#include <asm/asm-offsets.h>

i think this breaks PPC (which has no asm-offsets.h file). In any case i 
saw this build breakage too and the fix is in -rt2.

> We did find a regression.  I was mistaken earlier when I mentioned our 
> T60p laptops couldn't boot.  It turns out that issue was resolved 
> somewhere along the way and our published patches based on 21.5-rt19 
> do allow the laptop to boot event with acpi=on.  With 22.1-rt1 the 
> laptop crashes unless acpi=off.  Now that we have your queue we will 
> bisect this and post that fix as well.

ok. Make sure you check rt2 as well - and note that it's not fully 
bisectable with PREEMPT_RT enabled (but should probably be fully 
bisectable with PREEMPT_RT disabled). So check out first whether the 
problem still persists with PREEMPT_RT disabled.

	Ingo
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