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authorThomas Gleixner <tglx@linutronix.de>2015-08-02 20:38:27 +0000
committerThomas Gleixner <tglx@linutronix.de>2015-08-06 00:14:59 +0200
commita782a7e46bb50822fabfeb7271605762a59c86df (patch)
treea1b4d1798fc5b87f255716f07a170795cf5d5600 /arch/x86/kernel/irq_32.c
parentf61ae4fb66a4f7ae49e3456003fc4328d6db09c9 (diff)
x86/irq: Store irq descriptor in vector array
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>
Diffstat (limited to 'arch/x86/kernel/irq_32.c')
-rw-r--r--arch/x86/kernel/irq_32.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index cd74f5978ab9..217b01388038 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -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;