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Commit 46926b67 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

generic: add irq_desc in function in parameter 



So we could remove some duplicated calling to irq_desc

v2: make sure irq_desc in  init/main.c is not used without generic_hardirqs

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7d94f7ca

arch/x86/kernel/irq_64.c

+4 −2
Original line number Diff line number Diff line
@@ -189,6 +189,7 @@ u64 arch_irq_stat(void) 
asmlinkage unsigned int do_IRQ(struct pt_regs *regs)

{

	struct pt_regs *old_regs = set_irq_regs(regs);

	struct irq_desc *desc;



	/* high bit used in ret_from_ code  */

	unsigned vector = ~regs->orig_ax;
@@ -202,8 +203,9 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs) 
	stack_overflow_check(regs);

#endif



	if (likely(__irq_to_desc(irq)))

		generic_handle_irq(irq);

	desc = __irq_to_desc(irq);

	if (likely(desc))

		generic_handle_irq_desc(irq, desc);

	else {

		if (!disable_apic)

			ack_APIC_irq();

include/linux/irq.h

+6 −3
Original line number Diff line number Diff line
@@ -315,10 +315,8 @@ extern unsigned int __do_IRQ(unsigned int irq); 
 * irqchip-style controller then we call the ->handle_irq() handler,

 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.

 */

static inline void generic_handle_irq(unsigned int irq)

static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)

{

	struct irq_desc *desc = irq_to_desc(irq);



#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ

	desc->handle_irq(irq, desc);

#else
@@ -329,6 +327,11 @@ static inline void generic_handle_irq(unsigned int irq) 
#endif

}



static inline void generic_handle_irq(unsigned int irq)

{

	generic_handle_irq_desc(irq, irq_to_desc(irq));

}



/* Handling of unhandled and spurious interrupts: */

extern void note_interrupt(unsigned int irq, struct irq_desc *desc,

			   int action_ret);

init/main.c

+7 −0
Original line number Diff line number Diff line
@@ -590,6 +590,13 @@ void pre_alloc_dyn_array(void) 
		if (da->init_work)

			da->init_work(da);

	}

#else

#ifdef CONFIF_GENERIC_HARDIRQS

	unsigned int i;



	for (i = 0; i < NR_IRQS; i++)

		irq_desc[i].irq = i;

#endif

#endif

}

kernel/irq/handle.c

+30 −0
Original line number Diff line number Diff line
@@ -197,6 +197,21 @@ struct irq_desc *irq_to_desc(unsigned int irq) 
	 *  we run out of pre-allocate ones, allocate more

	 */

	printk(KERN_DEBUG "try to get more irq_desc %d\n", nr_irq_desc);

	{

		/* double check if some one mess up the list */

		struct irq_desc *desc;

		int count = 0;



		desc = &sparse_irqs[0];

		while (desc) {

			printk(KERN_DEBUG "found irq_desc for irq %d\n", desc->irq);

			if (desc->next)

				printk(KERN_DEBUG "found irq_desc for irq %d and next will be irq %d\n", desc->irq, desc->next->irq);

			desc = desc->next;

			count++;

		}

		printk(KERN_DEBUG "all preallocted %d\n", count);

	}



	total_bytes = sizeof(struct irq_desc) * nr_irq_desc;

	if (after_bootmem)
@@ -221,6 +236,21 @@ struct irq_desc *irq_to_desc(unsigned int irq) 


	desc->irq = irq;

	desc_pri->next = desc;

	{

		/* double check if some one mess up the list */

		struct irq_desc *desc;

		int count = 0;



		desc = &sparse_irqs[0];

		while (desc) {

			printk(KERN_DEBUG "1 found irq_desc for irq %d\n", desc->irq);

			if (desc->next)

				printk(KERN_DEBUG "1 found irq_desc for irq %d and next will be irq %d\n", desc->irq, desc->next->irq);

			desc = desc->next;

			count++;

		}

		printk(KERN_DEBUG "1 all preallocted %d\n", count);

	}



	return desc;

}