Commit 7c1d7cdc authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Ingo Molnar
Browse files

x86: unify do_IRQ() 



With the differences in interrupt handling hoisted into handle_irq(),
do_IRQ is more or less identical between 32 and 64 bit, so unify it.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 9b2b76a3

arch/x86/include/asm/irq.h

+2 −1
Original line number Diff line number Diff line
@@ -36,11 +36,12 @@ static inline int irq_canonicalize(int irq) 
extern void fixup_irqs(void);

#endif



extern unsigned int do_IRQ(struct pt_regs *regs);

extern void init_IRQ(void);

extern void native_init_IRQ(void);

extern bool handle_irq(unsigned irq, struct pt_regs *regs);



extern unsigned int do_IRQ(struct pt_regs *regs);



/* Interrupt vector management */

extern DECLARE_BITMAP(used_vectors, NR_VECTORS);

extern int vector_used_by_percpu_irq(unsigned int vector);

arch/x86/kernel/irq.c

+38 −0
Original line number Diff line number Diff line
@@ -6,10 +6,12 @@ 
#include <linux/kernel_stat.h>

#include <linux/seq_file.h>

#include <linux/smp.h>

#include <linux/ftrace.h>



#include <asm/apic.h>

#include <asm/io_apic.h>

#include <asm/irq.h>

#include <asm/idle.h>



atomic_t irq_err_count;
@@ -188,4 +190,40 @@ u64 arch_irq_stat(void) 
	return sum;

}





/*

 * do_IRQ handles all normal device IRQ's (the special

 * SMP cross-CPU interrupts have their own specific

 * handlers).

 */

unsigned int __irq_entry do_IRQ(struct pt_regs *regs)

{

	struct pt_regs *old_regs = set_irq_regs(regs);



	/* high bit used in ret_from_ code  */

	unsigned vector = ~regs->orig_ax;

	unsigned irq;



	exit_idle();

	irq_enter();



	irq = __get_cpu_var(vector_irq)[vector];



	if (!handle_irq(irq, regs)) {

#ifdef CONFIG_X86_64

		if (!disable_apic)

			ack_APIC_irq();

#endif



		if (printk_ratelimit())

			printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n",

			       __func__, smp_processor_id(), vector, irq);

	}



	irq_exit();



	set_irq_regs(old_regs);

	return 1;

}



EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);

arch/x86/kernel/irq_32.c

+0 −27
Original line number Diff line number Diff line
@@ -211,33 +211,6 @@ bool handle_irq(unsigned irq, struct pt_regs *regs) 
	return true;

}



/*

 * do_IRQ handles all normal device IRQ's (the special

 * SMP cross-CPU interrupts have their own specific

 * handlers).

 */

unsigned int do_IRQ(struct pt_regs *regs)

{

	struct pt_regs *old_regs;

	/* high bit used in ret_from_ code */

	unsigned vector = ~regs->orig_ax;

	unsigned irq;



	old_regs = set_irq_regs(regs);

	irq_enter();

	irq = __get_cpu_var(vector_irq)[vector];



	if (!handle_irq(irq, regs)) {

		printk(KERN_EMERG "%s: cannot handle IRQ %d vector %#x cpu %d\n",

					__func__, irq, vector, smp_processor_id());

		BUG();

	}



	irq_exit();

	set_irq_regs(old_regs);

	return 1;

}



#ifdef CONFIG_HOTPLUG_CPU

#include <asm/genapic.h>

arch/x86/kernel/irq_64.c

+0 −33
Original line number Diff line number Diff line
@@ -62,39 +62,6 @@ bool handle_irq(unsigned irq, struct pt_regs *regs) 
	return true;

}



/*

 * do_IRQ handles all normal device IRQ's (the special

 * SMP cross-CPU interrupts have their own specific

 * handlers).

 */

asmlinkage unsigned int __irq_entry do_IRQ(struct pt_regs *regs)

{

	struct pt_regs *old_regs = set_irq_regs(regs);



	/* high bit used in ret_from_ code  */

	unsigned vector = ~regs->orig_ax;

	unsigned irq;



	exit_idle();

	irq_enter();



	irq = __get_cpu_var(vector_irq)[vector];



	if (!handle_irq(irq, regs)) {

		if (!disable_apic)

			ack_APIC_irq();



		if (printk_ratelimit())

			printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n",

				__func__, smp_processor_id(), vector);

	}



	irq_exit();



	set_irq_regs(old_regs);

	return 1;

}



#ifdef CONFIG_HOTPLUG_CPU

/* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */

void fixup_irqs(void)

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