Messages in this thread | | | Subject | Re: [PATCH v3 10/10] clocksource/drivers/hyper-v: Move handling of STIMER0 interrupts | From | Daniel Lezcano <> | Date | Tue, 2 Mar 2021 23:18:40 +0100 |
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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@microsoft.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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