linux-kernel - Re: [PATCH v9 09/26] arm64: Unmask PMR before going idle

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Message-ID: <20190122152341.GE187049@arrakis.emea.arm.com>
Date:   Tue, 22 Jan 2019 15:23:41 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        daniel.thompson@...aro.org, joel@...lfernandes.org,
        marc.zyngier@....com, christoffer.dall@....com,
        james.morse@....com, will.deacon@....com, mark.rutland@....com
Subject: Re: [PATCH v9 09/26] arm64: Unmask PMR before going idle

On Mon, Jan 21, 2019 at 03:33:28PM +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.
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Suggested-by: Daniel Thompson <daniel.thompson@...aro.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>