linux-kernel - Re: [PATCH v3 -tip 1/5] x86, MSI: Support multiple MSIs in presense of IRQ remapping

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Date:	Thu, 4 Oct 2012 11:17:29 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Jeff Garzik <jgarzik@...ox.com>,
	Matthew Wilcox <willy@...ux.intel.com>, x86@...nel.org,
	linux-pci@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH v3 -tip 1/5] x86, MSI: Support multiple MSIs in presense
 of IRQ remapping


* Alexander Gordeev <agordeev@...hat.com> wrote:

> On Tue, Oct 02, 2012 at 01:25:24PM +0200, Ingo Molnar wrote:
> > > > > @@ -584,8 +586,12 @@ int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
> > > > >  #define irq_alloc_desc_from(from, node)		\
> > > > >  	irq_alloc_descs(-1, from, 1, node)
> > > > >  
> > > > > +#define irq_alloc_descs_from(from, cnt, node)	\
> > > > > +	irq_alloc_descs(-1, from, cnt, node)
> > > > > +
> > > > 
> > > > Please use inlines instead of macros. Might transform the one 
> > > > above it as well in the process.
> > > 
> > > You mean here do not introduce irq_alloc_descs_from, but rather use
> > > irq_alloc_descs() directly?
> > 
> > My suggestion is to add irq_alloc_descs_from() as a (very 
> > simple) inline function and change irq_alloc_desc_from() to be 
> > an inline function as well.
> 
> These defines were added on purpose with commit ec53cf2 ("irq: 
> don't put module.h into irq.h for tracking irqgen modules.") - 
> the relevant hunk is below. I suppose we do not want to revert 
> it?

Sigh - that commit is really making a step backwards, but indeed 
you are probably right that reintroducing the inlines would 
create header dependency problems - which should be addressed in 
another patch.

So I concur with your original approach that added a macro.

Thanks,

	Ingo
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