On Wed, 23 Aug 2006 01:05:58 -0700
Stephane Eranian <[email protected]> wrote:
> ...
>
> +irqreturn_t pfm_interrupt_handler(int irq, void *arg, struct pt_regs *regs)
> +{
> + u64 start_cycles, total_cycles;
> +
> + get_cpu();
> +
> + start_cycles = pfm_arch_get_itc();
> +
> + __pfm_interrupt_handler(regs);
> +
> + total_cycles = pfm_arch_get_itc();
> +
> + __get_cpu_var(pfm_stats).pfm_ovfl_intr_cycles += total_cycles - start_cycles;
> +
> + put_cpu_no_resched();
> + return IRQ_HANDLED;
> +}
If this code is only ever called from interrupt context then I suspect the
get_cpu() is not needed. __get_cpu_var() requires that preemption be
disabled (so we cannot wander over to a different CPU midway) but IRQ
code doesn't get preempted.
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