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ARC: intc: Document arc_request_percpu_irq() better

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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2015-12-11 19:31:23 +05:30
parent c6317bc7c5
commit c512c6ba7a
1 changed files with 12 additions and 0 deletions
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12
arch/arc/kernel/irq.c
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@ -51,6 +51,18 @@ void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
set_irq_regs(old_regs);
}
/*
* API called for requesting percpu interrupts - called by each CPU
* - For boot CPU, actually request the IRQ with genirq core + enables
* - For subsequent callers only enable called locally
*
* Relies on being called by boot cpu first (i.e. request called ahead) of
* any enable as expected by genirq. Hence Suitable only for TIMER, IPI
* which are guaranteed to be setup on boot core first.
* Late probed peripherals such as perf can't use this as there no guarantee
* of being called on boot CPU first.
*/
void arc_request_percpu_irq(int irq, int cpu,
irqreturn_t (*isr)(int irq, void *dev),
const char *irq_nm,