linux-kernel - Re: sparc64 build breakage...

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Date:	Thu, 22 Jan 2009 00:38:56 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	David Miller <davem@...emloft.net>, mpm@...enic.com,
	linux-kernel@...r.kernel.org
Subject: Re: sparc64 build breakage...

Ingo Molnar wrote:
> * David Miller <davem@...emloft.net> wrote:
> 
>> From: David Miller <davem@...emloft.net>
>> Date: Wed, 21 Jan 2009 17:15:53 -0800 (PST)
>>
>>> This change:
>>>
>>> commit d7e51e66899f95dabc89b4d4c6674a6e50fa37fc
>>> Author: Yinghai Lu <yinghai@...nel.org>
>>> Date:   Wed Jan 7 15:03:13 2009 -0800
>>>
>>>     sparseirq: make some func to be used with genirq
>>>
>>> breaks the sparc64 build:
>> ..
>>> This should fix it:
>>>
>>> sparc64: Fix build by using kstat_irqs_cpu().
>> And here is a mix for the next failure.
> 
> Applied your fixes to tip/irq/sparseirq:
> 
>  e81838d: sparc64: Fix build by using kstat_irqs_cpu()
>  623d3f0: sparc64: Fix build by including linux/irq.h into time_64.c
> 
> thanks David!
> 
>> But really, either linux/kernel_stat.h provides the 
>> kstat_incr_irqs_this_cpu interface or linux/irq.h does, not both.
> 
> Yes, but every time someone tries to clean those dependencies up, it gets 
> held up by non-genirq architectures:
> 
>  /*
>   * Please do not include this file in generic code.  There is currently
>   * no requirement for any architecture to implement anything held
>   * within this file.
>   *
>   * Thanks. --rmk
>   */
> 
> Meanwhile that particular comment is moot because ARM is genirq - but 
> there's a handful of other non-genirq architectures so this area of code 
> continues to be a mess.
> 
> I guess we could move all the APIs to kernel_stat.h. Yinghai?

sth like:

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 5d6ad5d..7977d54 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -202,12 +202,6 @@ extern struct irq_desc irq_desc[NR_IRQS];
 extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu);
 #endif /* CONFIG_SPARSE_IRQ */
 
-#define kstat_irqs_this_cpu(DESC) \
-	((DESC)->kstat_irqs[smp_processor_id()])
-#define kstat_incr_irqs_this_cpu(irqno, DESC) \
-	((DESC)->kstat_irqs[smp_processor_id()]++)
-
-
 extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu);
 
 static inline struct irq_desc *
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 51d2129..b6d2887 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -52,16 +52,19 @@ static inline void kstat_incr_irqs_this_cpu(unsigned int irq,
 {
 	kstat_this_cpu.irqs[irq]++;
 }
-#endif
-
 
-#ifndef CONFIG_GENERIC_HARDIRQS
 static inline unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
 {
        return kstat_cpu(cpu).irqs[irq];
 }
 #else
+#include <linux/irq.h>
 extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
+#define kstat_irqs_this_cpu(DESC) \
+	((DESC)->kstat_irqs[smp_processor_id()])
+#define kstat_incr_irqs_this_cpu(irqno, DESC) \
+	((DESC)->kstat_irqs[smp_processor_id()]++)
+
 #endif
 
 /*
--
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