The code can be simplified a little by factoring out the IS_ERR_OR_NULL check from the platform-specific handle_irq implementations, and by inlining the remaining call to generic_handle_irq_desc for 64bit systems.
Signed-off-by: Heiner Kallweit <[email protected]> --- v2: - add "likely" to if clause and reorder it - For 64bit, remove handle_irq and inline call to generic_handle_irq_desc --- arch/x86/include/asm/irq.h | 2 +- arch/x86/kernel/irq.c | 9 +++++++-- arch/x86/kernel/irq_32.c | 7 +------ arch/x86/kernel/irq_64.c | 9 --------- 4 files changed, 9 insertions(+), 18 deletions(-) diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h index 8f95686ec..a176f6165 100644 --- a/arch/x86/include/asm/irq.h +++ b/arch/x86/include/asm/irq.h @@ -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); diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index 4215653f8..f1c8f350d 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -243,8 +243,13 @@ __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))) { +#ifdef CONFIG_X86_32 + handle_irq(desc, regs); +#else + generic_handle_irq_desc(desc); +#endif + } else { ack_APIC_irq(); if (desc != VECTOR_RETRIGGERED && desc != VECTOR_SHUTDOWN) { diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index fc34816c6..a759ca97c 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -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; } diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c index 6bf6517a0..12df3a4ab 100644 --- a/arch/x86/kernel/irq_64.c +++ b/arch/x86/kernel/irq_64.c @@ -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 -- 2.22.1
