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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
This commit is contained in:
Linus Torvalds 2019-09-17 11:13:48 -07:00
parent 3fb7f3a6ed 8725fcd99a
commit 258b16ec9a
5 changed files with 11 additions and 21 deletions
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4
arch/x86/include/asm/hw_irq.h
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@ -153,8 +153,8 @@ extern char irq_entries_start[];
extern char spurious_entries_start[]; extern char spurious_entries_start[];
#define VECTOR_UNUSED NULL #define VECTOR_UNUSED NULL
#define VECTOR_SHUTDOWN ((void *)~0UL) #define VECTOR_SHUTDOWN ((void *)-1L)
#define VECTOR_RETRIGGERED ((void *)~1UL) #define VECTOR_RETRIGGERED ((void *)-2L)
typedef struct irq_desc* vector_irq_t[NR_VECTORS]; typedef struct irq_desc* vector_irq_t[NR_VECTORS];
DECLARE_PER_CPU(vector_irq_t, vector_irq); DECLARE_PER_CPU(vector_irq_t, vector_irq);

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);

10
arch/x86/kernel/irq.c
View File

@ -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"); 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_UNUSED) {
pr_emerg_ratelimited("%s: %d.%d No irq handler for vector\n", pr_emerg_ratelimited("%s: %d.%d No irq handler for vector\n",
__func__, smp_processor_id(), __func__, smp_processor_id(),
vector); vector);

7
arch/x86/kernel/irq_32.c
View File

@ -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