linux-kernel - Re: -rt doesn't compile for UML

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Message-ID: <20071128154152.GA742@elte.hu>
Date:	Wed, 28 Nov 2007 16:41:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	jdike@...toit.com, user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: -rt doesn't compile for UML


* Miklos Szeredi <miklos@...redi.hu> wrote:

> > On Wed, Nov 28, 2007 at 02:09:45PM +0100, Miklos Szeredi wrote:
> > > kernel/latency_trace.c:28:21: error: asm/rtc.h: No such file or directory
> > 
> > For things like this, look at the host's asm/foo.h and see if it's
> > usable in UML (and contains things that you need).  If it is, just
> > make a asm-um/foo.h which just includes "asm/arch/foo.h".
> 
> Yeah, I know that trick :)
> 
> It doesn't help in this case.  I've gotten as far as realizing that 
> the latency tracer needs the irqflags tracing 
> (Documentation/irqflags-tracing.tx) and that UML doesn't yet support 
> that.

it doesnt need it - turn IRQOFF_TRACING off. You want FUNCTION_TRACING 
to work (and perhaps WAKEUP_TIMING) so that you can take a look at 
what's going on, right?

	Ingo
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