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x86/irq: Factor out handler invocation from common_interrupt()

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Prepare for calling external interrupt handlers directly from the posted
MSI demultiplexing loop. Extract the common code from common_interrupt() to
avoid code duplication.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-8-jacob.jun.pan@linux.intel.com
This commit is contained in:
Jacob Pan 2024-04-23 10:41:09 -07:00 committed by Thomas Gleixner
parent 43650dcf6d
commit 6087c7f36a
1 changed files with 14 additions and 9 deletions
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23
arch/x86/kernel/irq.c
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@ -242,18 +242,10 @@ static __always_inline void handle_irq(struct irq_desc *desc,
__handle_irq(desc, regs);
}
/*
* common_interrupt() handles all normal device IRQ's (the special SMP
* cross-CPU interrupts have their own entry points).
*/
DEFINE_IDTENTRY_IRQ(common_interrupt)
static __always_inline void call_irq_handler(int vector, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
struct irq_desc *desc;
/* entry code tells RCU that we're not quiescent. Check it. */
RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
desc = __this_cpu_read(vector_irq[vector]);
if (likely(!IS_ERR_OR_NULL(desc))) {
handle_irq(desc, regs);
@ -268,7 +260,20 @@ DEFINE_IDTENTRY_IRQ(common_interrupt)
__this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
}
}
}
/*
* common_interrupt() handles all normal device IRQ's (the special SMP
* cross-CPU interrupts have their own entry points).
*/
DEFINE_IDTENTRY_IRQ(common_interrupt)
{
struct pt_regs *old_regs = set_irq_regs(regs);
/* entry code tells RCU that we're not quiescent. Check it. */
RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
call_irq_handler(vector, regs);
set_irq_regs(old_regs);
}