Hi Ben, On Mon, 23 Sep 2013 14:35:58 +1000 Benjamin Herrenschmidt <b...@kernel.crashing.org> wrote: > > diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c > index c69440c..0c9646f 100644 > --- a/arch/powerpc/kernel/irq.c > +++ b/arch/powerpc/kernel/irq.c > @@ -443,46 +443,7 @@ void migrate_irqs(void) > > static inline void handle_one_irq(unsigned int irq) > { > - struct thread_info *curtp, *irqtp; > - unsigned long saved_sp_limit; > - struct irq_desc *desc; > - > - desc = irq_to_desc(irq); > - if (!desc) > - return; > - > - /* Switch to the irq stack to handle this */ > - curtp = current_thread_info(); > - irqtp = hardirq_ctx[smp_processor_id()]; > - > - if (curtp == irqtp) { > - /* We're already on the irq stack, just handle it */ > - desc->handle_irq(irq, desc); > - return; > - } > - > - saved_sp_limit = current->thread.ksp_limit; > - > - irqtp->task = curtp->task; > - irqtp->flags = 0; > - > - /* Copy the softirq bits in preempt_count so that the > - * softirq checks work in the hardirq context. */ > - irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) | > - (curtp->preempt_count & SOFTIRQ_MASK); > > - current->thread.ksp_limit = (unsigned long)irqtp + > - _ALIGN_UP(sizeof(struct thread_info), 16); > - > - call_handle_irq(irq, desc, irqtp, desc->handle_irq); > - current->thread.ksp_limit = saved_sp_limit; > - irqtp->task = NULL; > - > - /* Set any flag that may have been set on the > - * alternate stack > - */ > - if (irqtp->flags) > - set_bits(irqtp->flags, &curtp->flags); > }
This function ends up as a single blank line ... > @@ -519,18 +480,64 @@ void do_IRQ(struct pt_regs *regs) > */ > irq = ppc_md.get_irq(); > > - /* We can hard enable interrupts now */ > + /* We can hard enable interrupts now to allow perf interrupts */ > may_hard_irq_enable(); > > /* And finally process it */ > - if (irq != NO_IRQ) > - handle_one_irq(irq); then you remove the only call, so why not just remove the function completely? -- Cheers, Stephen Rothwell s...@canb.auug.org.au
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