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Date: Fri, 5 Feb 2021 14:53:17 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Thomas Gleixner <tglx@...utronix.de> Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org, Josh Poimboeuf <jpoimboe@...hat.com>, Kees Cook <keescook@...omium.org> Subject: Re: [patch 03/12] x86/irq/64: Adjust the per CPU irq stack pointer by 8 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.
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