linux-kernel - Re: [PATCH v8 09/26] arm64: Unmask PMR before going idle

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Message-ID: <20190118162336.GH118707@arrakis.emea.arm.com>
Date:   Fri, 18 Jan 2019 16:23:36 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, mark.rutland@....com,
        daniel.thompson@...aro.org, marc.zyngier@....com,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        christoffer.dall@....com, james.morse@....com,
        joel@...lfernandes.org
Subject: Re: [PATCH v8 09/26] arm64: Unmask PMR before going idle

On Tue, Jan 08, 2019 at 02:07:27PM +0000, Julien Thierry wrote:
> CPU does not received signals for interrupts with a priority masked by
> ICC_PMR_EL1. This means the CPU might not come back from a WFI
> instruction.
> 
> Make sure ICC_PMR_EL1 does not mask interrupts when doing a WFI.
> 
> Since the logic of cpu_do_idle is becoming a bit more complex than just
> two instructions, lets turn it from ASM to C.

I haven't checked all the call paths, so asking here: does the core code
normally call arch_cpu_idle() with IRQs off?

-- 
Catalin