linux-kernel - Re: [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls

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Date:	Thu, 11 Jul 2013 15:11:15 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm-ppc@...r.kernel.org
Subject: Re: [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls


On 11.07.2013, at 14:33, Benjamin Herrenschmidt wrote:

> On Thu, 2013-07-11 at 15:12 +1000, Alexey Kardashevskiy wrote:
>>>> Any debug code is prohibited? Ok, I'll remove.
>>> 
>>> Debug code that requires code changes is prohibited, yes.
>>> Debug code that is runtime switchable (pr_debug, trace points, etc)
>>> are allowed.
> 
> Bollox.
> 
> $ grep DBG\( arch/powerpc/ -r | wc -l
> 418
> 
> Also pr_devel is not runtime switchable in normal kernels either and
> still an "official" kernel interface.
> 
>> Is there any easy way to enable just this specific udbg_printf (not all of
>> them at once)? Trace points do not work in real mode as we figured out.
> 
> The cleaner way to do it is to use some kind of local macro that you
> enable/disable by changing a #define at the top of the function, possibly
> several.

If you do that in a way that doesn't bitrot, that's acceptable, yes. Something that leaves cpp compile checks working while optimizing out the debug code.


Alex

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