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Subjectgenirq handle helper
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Hi Ingo, Thomas !

This simple pach makes the transition easier. By making
generic_handle_irq() call the old __do_IRQ if no new-style handler exist
for a given irq, the transition from old style to new style is made
easier for me. That is, I can have some PICs use the new handler
mecanism while old ones still get __do_IRQ without having the common
powerpc code caring about the type of PIC (it just does
generic_handle_irq()).

Might be useful to others as well, at least until everybody is ported
over.

Cheers,
Ben.

Index: linux-work/include/linux/irq.h
===================================================================
--- linux-work.orig/include/linux/irq.h 2006-05-31 11:26:45.000000000 +1000
+++ linux-work/include/linux/irq.h 2006-05-31 13:31:11.000000000 +1000
@@ -176,17 +176,6 @@ typedef struct irq_desc irq_desc_t;
*/
#include <asm/hw_irq.h>

-/*
- * Architectures call this to let the generic IRQ layer
- * handle an interrupt:
- */
-static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
-{
- struct irq_desc *desc = irq_desc + irq;
-
- desc->handle_irq(irq, desc, regs);
-}
-
extern int setup_irq(unsigned int irq, struct irqaction *new);

#ifdef CONFIG_GENERIC_HARDIRQS
@@ -316,6 +305,20 @@ handle_irq_name(void fastcall (*handle)(
*/
extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);

+/*
+ * Architectures call this to let the generic IRQ layer
+ * handle an interrupt:
+ */
+static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
+{
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (desc->handle_irq)
+ desc->handle_irq(irq, desc, regs);
+ else
+ __do_IRQ(irq, regs);
+}
+
/* Handling of unhandled and spurious interrupts: */
extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
int action_ret, struct pt_regs *regs);

-
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