[PATCH v4 3/7] arm/imx: add gic_handle_irq function

[Shawn Guo]

On Thu, Sep 29, 2011 at 10:34:09AM +0100, Russell King - ARM Linux wrote:
> On Wed, Sep 28, 2011 at 05:06:44PM +0800, Shawn Guo wrote:
> > +#ifdef CONFIG_SMP
> > +		else if (irqnr < 16) {
> > +			writel_relaxed(irqstat, gic_cpu_base_addr +
> > +						GIC_CPU_EOI);
> > +			do_IPI(irqnr, regs);
> > +		}
> > +#endif
> > +#ifdef CONFIG_LOCAL_TIMERS
> > +		else if (irqnr == 29) {
> > +			writel_relaxed(irqstat, gic_cpu_base_addr +
> > +						GIC_CPU_EOI);
> > +			do_local_timer(regs);
> > +		}
> > +#endif
> 
> As I've said for similar patches. neither of these two functions are
> designed to be called from another C function (because they're marked
> __exception or __exception_irq_entry).  Both of these markers tell the
> unwinder that a struct pt_regs is located directly above the functions
> stack frame.
> 
I'm also wondering the consequence of not doing so, because we are
seeing icip_handle_irq() and ichp_handle_irq() (arch/arm/mach-pxa/irq.c)
are doing the same thing, and we are not running into any problem with
above code.

-- 
Regards,
Shawn