linux-kernel - Re: [PATCH 0/2] arm64: remove generic ARM cpuidle support

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Date:   Mon, 30 May 2022 17:37:36 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Michael Walle <michael@...le.cc>,
        Catalin Marinas <catalin.marinas@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH 0/2] arm64: remove generic ARM cpuidle support

On 29/05/2022 20:13, Michael Walle wrote:
> Playing with an own PSCI implementation, I've noticed that the cpuidle-arm
> driver doesn't work on arm64. It doesn't probe because since commit
> 788961462f34 ("ARM: psci: cpuidle: Enable PSCI CPUidle driver") the
> arm_cpuidle_init() can only return -EOPNOTSUPP, because the commit removed
> the cpu_idle_init and cpu_suspend ops.
> 
> It left me puzzled for quite some time. It seems that the cpuidle-psci is
> the preferred one and this has been the case for quite some time. The
> mentioned commit first appeared in v5.4.
> 
> Remove the ARM64 support for the cpuidle-arm driver, which then let us
> remove all the supporting arch code.
> 
> Michael Walle (2):
>    cpuidle: cpuidle-arm: remove arm64 support
>    arm64: cpuidle: remove generic cpuidle support
> 
>   arch/arm64/include/asm/cpu_ops.h |  9 ---------
>   arch/arm64/include/asm/cpuidle.h | 15 ---------------
>   arch/arm64/kernel/cpuidle.c      | 29 -----------------------------
>   drivers/cpuidle/Kconfig.arm      |  3 ++-
>   4 files changed, 2 insertions(+), 54 deletions(-)

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>


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