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x86/irq: Move IS_ERR_OR_NULL() check into common do_IRQ() code 

Both the 64bit and the 32bit handle_irq() implementation check the irq
descriptor pointer with IS_ERR_OR_NULL() and return failure. That can be
done simpler in the common do_IRQ() code.

This reduces the 64bit handle_irq() function to a wrapper around
generic_handle_irq_desc(). Invoke it directly from do_IRQ() to spare the
extra function call.

[ tglx: Got rid of the #ifdef and massaged changelog ]

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/2ec758c7-9aaa-73ab-f083-cc44c86aa741@gmail.com
This commit is contained in:
Heiner Kallweit 2019-08-19 21:36:09 +02:00 committed by Thomas Gleixner
parent e30c44e2e5
commit d6f83427ff
4 changed files with 8 additions and 18 deletions
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2
arch/x86/include/asm/irq.h
View File

@ -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 (*x86_platform_ipi_callback)(void);
extern void native_init_IRQ(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); extern __visible unsigned int do_IRQ(struct pt_regs *regs);

8
arch/x86/kernel/irq.c
View File

@ -243,8 +243,12 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU"); RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
desc = __this_cpu_read(vector_irq[vector]); desc = __this_cpu_read(vector_irq[vector]);
if (likely(!IS_ERR_OR_NULL(desc))) {
if (!handle_irq(desc, regs)) { if (IS_ENABLED(CONFIG_X86_32))
handle_irq(desc, regs);
else
generic_handle_irq_desc(desc);
} else {
ack_APIC_irq(); ack_APIC_irq();
if (desc != VECTOR_RETRIGGERED && desc != VECTOR_SHUTDOWN) { if (desc != VECTOR_RETRIGGERED && desc != VECTOR_SHUTDOWN) {

7
arch/x86/kernel/irq_32.c
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@ -148,18 +148,13 @@ void do_softirq_own_stack(void)
call_on_stack(__do_softirq, isp); 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(); int overflow = check_stack_overflow();
if (IS_ERR_OR_NULL(desc))
return false;
if (user_mode(regs) || !execute_on_irq_stack(overflow, desc)) { if (user_mode(regs) || !execute_on_irq_stack(overflow, desc)) {
if (unlikely(overflow)) if (unlikely(overflow))
print_stack_overflow(); print_stack_overflow();
generic_handle_irq_desc(desc); generic_handle_irq_desc(desc);
} }
return true;
} }

9
arch/x86/kernel/irq_64.c
View File

@ -26,15 +26,6 @@
DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible; DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible;
DECLARE_INIT_PER_CPU(irq_stack_backing_store); 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 #ifdef CONFIG_VMAP_STACK
/* /*
* VMAP the backing store with guard pages * VMAP the backing store with guard pages