linux-kernel - Re: [PATCH 1/4] nmi_watchdog: use a boolean config flag for compiling

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Message-ID: <20100215182117.GC5119@lenovo>
Date:	Mon, 15 Feb 2010 21:21:17 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	aris@...hat.com, Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 1/4] nmi_watchdog: use a boolean config flag for
	compiling

On Mon, Feb 15, 2010 at 09:13:01PM +0300, Cyrill Gorcunov wrote:
...
> > Looking through the code, is there ever case where 'apic' is undefined?
> > The arch_trigger_all_cpu_backtrace should match identically to the old nmi
> > code, so I am stuck on how to fix this.
> > 
> > Thoughts?
> > 
> 
> It looks familiar to one problem with HW breakpoints "Kconfig select"
> issue Frederic fixed once not that long ago, if I recall correctly.
> 
> So due to select we choose to compile hw_nmi.c, but CONFIG_LOCAL_APIC
> (or APIC on UP) is turned off. So apic.c is not compiled. And at stage
> of linking we get unresolved symbol.
> 
> I don't remember the details how Frederic fixed HW breakpoints "select"
> issue, CC'ed :) But you may google to find it out.
>

Here is what I mean http://patchwork.kernel.org/patch/67973/
 
	-- Cyrill
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