On Thu, Feb 04, 2021 at 09:49:06PM +0100, Thomas Gleixner wrote: > Move the definition > next to the inuse flag so they end up in the same cache line.
> -DEFINE_PER_CPU(struct irq_stack *, hardirq_stack_ptr); > +DEFINE_PER_CPU(void *, hardirq_stack_ptr); > DEFINE_PER_CPU(bool, hardirq_stack_inuse); Not strictly guaranteed they end up in the same line. If you stick them in a struct and force alignment on the instance you'll have better guarantees.
