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x86/irq: Store irq descriptor in vector array

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We can spare the irq_desc lookup in the interrupt entry code if we
store the descriptor pointer in the vector array instead the interrupt
number.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Link: http://lkml.kernel.org/r/20150802203609.717724106@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2015-08-02 20:38:27 +00:00
parent f61ae4fb66
commit a782a7e46b
8 changed files with 58 additions and 66 deletions
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9
arch/x86/kernel/irq_32.c
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@@ -148,21 +148,20 @@ void do_softirq_own_stack(void)
call_on_stack(__do_softirq, isp);
}
bool handle_irq(unsigned irq, struct pt_regs *regs)
bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
{
struct irq_desc *desc;
unsigned int irq = irq_desc_get_irq(desc);
int overflow;
overflow = check_stack_overflow();
desc = irq_to_desc(irq);
if (unlikely(!desc))
if (IS_ERR_OR_NULL(desc))
return false;
if (user_mode(regs) || !execute_on_irq_stack(overflow, desc, irq)) {
if (unlikely(overflow))
print_stack_overflow();
desc->handle_irq(irq, desc);
generic_handle_irq_desc(irq, desc);
}
return true;