linux-kernel - Re: [PATCH 2/3] Revert "arm64: smp: avoid NMI IPIs with broken MediaTek FW"

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Message-ID: <ZS-7fbqGJez7ho9r@FVFF77S0Q05N>
Date:   Wed, 18 Oct 2023 12:03:25 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Chen-Yu Tsai <wenst@...omium.org>,
        D Scott Phillips <scott@...amperecomputing.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <vschneid@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] Revert "arm64: smp: avoid NMI IPIs with broken
 MediaTek FW"

On Fri, Oct 06, 2023 at 03:15:52PM -0700, Douglas Anderson wrote:
> This reverts commit a07a594152173a3dd3bdd12fc7d73dbba54cdbca.
> 
> This is no longer needed after the patch ("arm64: Disable GiC
> priorities on Mediatek devices w/ firmware issues").

That first patch has a typo in the title: s/GiC/GIC/

This patch makes sense to me, so:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>  arch/arm64/kernel/smp.c      | 5 +----
>  drivers/irqchip/irq-gic-v3.c | 2 +-
>  2 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 16ead57a583d..f36a97a54d2b 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -964,10 +964,7 @@ static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
>  
>  static bool ipi_should_be_nmi(enum ipi_msg_type ipi)
>  {
> -	DECLARE_STATIC_KEY_FALSE(supports_pseudo_nmis);
> -
> -	if (!system_uses_irq_prio_masking() ||
> -	    !static_branch_likely(&supports_pseudo_nmis))
> +	if (!system_uses_irq_prio_masking())
>  		return false;
>  
>  	switch (ipi) {
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index 737da1b9aabf..787ccc880b22 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -106,7 +106,7 @@ static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
>   * - Figure 4-7 Secure read of the priority field for a Non-secure Group 1
>   *   interrupt.
>   */
> -DEFINE_STATIC_KEY_FALSE(supports_pseudo_nmis);
> +static DEFINE_STATIC_KEY_FALSE(supports_pseudo_nmis);
>  
>  DEFINE_STATIC_KEY_FALSE(gic_nonsecure_priorities);
>  EXPORT_SYMBOL(gic_nonsecure_priorities);
> -- 
> 2.42.0.609.gbb76f46606-goog
>