linux-kernel - Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver.

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Date:   Tue, 2 Feb 2021 20:15:26 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Mohamed Mediouni <mohamed.mediouni@...amail.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Hector Martin <marcan@...can.st>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Stan Skowronek <stan@...ellium.com>
Subject: Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple
 AIC driver.

Hi Mohamed,

just a small drive-by comment:

On Wed, Jan 20, 2021 at 2:32 PM Mohamed Mediouni
<mohamed.mediouni@...amail.com> wrote:

> +       for_each_cpu (cpu, mask) {
> +               smp_mb__before_atomic();
> +               atomic_or(1u << irqnr, per_cpu_ptr(&aic_ipi_mask, cpu));

Use:

#include <linux/bits.h>

atomic_or(BIT(irqnr), per_cpu_ptr(&aic_ipi_mask, cpu));

Yours,
Linus Walleij