Re: [PATCH v2 15/17] arm64: Remove custom IRQ stat accounting

From: Valentin Schneider <valentin.schneider@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Russell King <linux@arm.linux.org.uk>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>,
	Sumit Garg <sumit.garg@linaro.org>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Gregory Clement <gregory.clement@bootlin.com>,
	Andrew Lunn <andrew@lunn.ch>,
	kernel-team@android.com
Subject: Re: [PATCH v2 15/17] arm64: Remove custom IRQ stat accounting
Date: Fri, 10 Jul 2020 20:58:50 +0100	[thread overview]
Message-ID: <jhjmu47kupx.mognet@arm.com> (raw)
In-Reply-To: <20200624195811.435857-16-maz@kernel.org>

On 24/06/20 20:58, Marc Zyngier wrote:
> Let's switch the arm64 code to the core accounting, which already
> does everything we need.
>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
>  arch/arm64/include/asm/hardirq.h |  9 ---------
>  arch/arm64/kernel/smp.c          | 24 ++++++------------------
>  2 files changed, 6 insertions(+), 27 deletions(-)
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index ed8a8184e3b6..8b903ceef2be 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -991,7 +979,7 @@ void __init set_smp_ipi_range(int ipi_base, int n)
>               int err;
>
>               err = request_percpu_irq(ipi_base + i, ipi_handler,
> -					 "IPI", &irq_stat);
> +					 "IPI", &cpu_number);

That pointer remains unused in ipi_handler(); I suppose it's just a matter
of cosmetics? I see that we leave it as irq_stat in arm, I suppose simply
because we don't have a cpu_number equivalent there and need *some* percpu
variable for the request to happen.

>               WARN_ON(err);
>
>               ipi_desc[i] = irq_to_desc(ipi_base + i);