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Commit 258b16ec authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 interrupt updates from Thomas Gleixner:
 "A small set of changes to simplify and improve the interrupt handling
  in do_IRQ() by moving the common case into common code and thereby
  cleaning it up"

* 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/irq: Check for VECTOR_UNUSED directly
  x86/irq: Move IS_ERR_OR_NULL() check into common do_IRQ() code
  x86/irq: Improve definition of VECTOR_SHUTDOWN et al
parents 3fb7f3a6 8725fcd9

arch/x86/include/asm/hw_irq.h

+2 −2
Original line number Diff line number Diff line
@@ -153,8 +153,8 @@ extern char irq_entries_start[]; 
extern char spurious_entries_start[];



#define VECTOR_UNUSED		NULL

#define VECTOR_SHUTDOWN		((void *)~0UL)

#define VECTOR_RETRIGGERED	((void *)~1UL)

#define VECTOR_SHUTDOWN		((void *)-1L)

#define VECTOR_RETRIGGERED	((void *)-2L)



typedef struct irq_desc* vector_irq_t[NR_VECTORS];

DECLARE_PER_CPU(vector_irq_t, vector_irq);

arch/x86/include/asm/irq.h

+1 −1
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ extern __visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs); 
extern void (*x86_platform_ipi_callback)(void);

extern void native_init_IRQ(void);



extern bool handle_irq(struct irq_desc *desc, struct pt_regs *regs);

extern void handle_irq(struct irq_desc *desc, struct pt_regs *regs);



extern __visible unsigned int do_IRQ(struct pt_regs *regs);

arch/x86/kernel/irq.c

+7 −3
Original line number Diff line number Diff line
@@ -243,11 +243,15 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs) 
	RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");



	desc = __this_cpu_read(vector_irq[vector]);



	if (!handle_irq(desc, regs)) {

	if (likely(!IS_ERR_OR_NULL(desc))) {

		if (IS_ENABLED(CONFIG_X86_32))

			handle_irq(desc, regs);

		else

			generic_handle_irq_desc(desc);

	} else {

		ack_APIC_irq();



		if (desc != VECTOR_RETRIGGERED && desc != VECTOR_SHUTDOWN) {

		if (desc == VECTOR_UNUSED) {

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

					     __func__, smp_processor_id(),

					     vector);

arch/x86/kernel/irq_32.c

+1 −6
Original line number Diff line number Diff line
@@ -148,18 +148,13 @@ void do_softirq_own_stack(void) 
	call_on_stack(__do_softirq, isp);

}



bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)

void handle_irq(struct irq_desc *desc, struct pt_regs *regs)

{

	int overflow = check_stack_overflow();



	if (IS_ERR_OR_NULL(desc))

		return false;



	if (user_mode(regs) || !execute_on_irq_stack(overflow, desc)) {

		if (unlikely(overflow))

			print_stack_overflow();

		generic_handle_irq_desc(desc);

	}



	return true;

}

arch/x86/kernel/irq_64.c

+0 −9
Original line number Diff line number Diff line
@@ -26,15 +26,6 @@ 
DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible;

DECLARE_INIT_PER_CPU(irq_stack_backing_store);



bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)

{

	if (IS_ERR_OR_NULL(desc))

		return false;



	generic_handle_irq_desc(desc);

	return true;

}



#ifdef CONFIG_VMAP_STACK

/*

 * VMAP the backing store with guard pages