linux-kernel - Re: [PATCH v3 10/10] clocksource/drivers/hyper-v: Move handling of STIMER0 interrupts

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Date:   Tue, 2 Mar 2021 23:18:40 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Michael Kelley <mikelley@...rosoft.com>, sthemmin@...rosoft.com,
        kys@...rosoft.com, wei.liu@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, arnd@...db.de,
        linux-hyperv@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH v3 10/10] clocksource/drivers/hyper-v: Move handling of
 STIMER0 interrupts

On 02/03/2021 22:38, Michael Kelley wrote:
> STIMER0 interrupts are most naturally modeled as per-cpu IRQs. But
> because x86/x64 doesn't have per-cpu IRQs, the core STIMER0 interrupt
> handling machinery is done in code under arch/x86 and Linux IRQs are
> not used. Adding support for ARM64 means adding equivalent code
> using per-cpu IRQs under arch/arm64.
> 
> A better model is to treat per-cpu IRQs as the normal path (which it is
> for modern architectures), and the x86/x64 path as the exception. Do this
> by incorporating standard Linux per-cpu IRQ allocation into the main
> SITMER0 driver code, and bypass it in the x86/x64 exception case. For
> x86/x64, special case code is retained under arch/x86, but no STIMER0
> interrupt handling code is needed under arch/arm64.
> 
> No functional change.
> 
> Signed-off-by: Michael Kelley <mikelley@...rosoft.com>

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

[ ... ]

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