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 09:54:43 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
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

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?


@@ -567,29 +567,21 @@ static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
 int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
 		struct module *owner);
 
-static inline int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt,
-		int node)
-{
-	return __irq_alloc_descs(irq, from, cnt, node, THIS_MODULE);
-}
+/* use macros to avoid needing export.h for THIS_MODULE */
+#define irq_alloc_descs(irq, from, cnt, node)	\
+	__irq_alloc_descs(irq, from, cnt, node, THIS_MODULE)
 
-void irq_free_descs(unsigned int irq, unsigned int cnt);
-int irq_reserve_irqs(unsigned int from, unsigned int cnt);
+#define irq_alloc_desc(node)			\
+	irq_alloc_descs(-1, 0, 1, node)
 
-static inline int irq_alloc_desc(int node)
-{
-	return irq_alloc_descs(-1, 0, 1, node);
-}
+#define irq_alloc_desc_at(at, node)		\
+	irq_alloc_descs(at, at, 1, node)
 
-static inline int irq_alloc_desc_at(unsigned int at, int node)
-{
-	return irq_alloc_descs(at, at, 1, node);
-}
+#define irq_alloc_desc_from(from, node)		\
+	irq_alloc_descs(-1, from, 1, node)
 
-static inline int irq_alloc_desc_from(unsigned int from, int node)
-{
-	return irq_alloc_descs(-1, from, 1, node);
-}
+void irq_free_descs(unsigned int irq, unsigned int cnt);
+int irq_reserve_irqs(unsigned int from, unsigned int cnt);
 
 static inline void irq_free_desc(unsigned int irq)
 {



-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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