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

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Message-ID: <86bm41w1yu.wl-marc.zyngier@arm.com>
Date:   Mon, 28 Jan 2019 09:44:41 +0000
From:   Marc Zyngier <marc.zyngier@....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>, <christoffer.dall@....com>,
        <james.morse@....com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <mark.rutland@....com>
Subject: Re: [PATCH v9 09/26] arm64: Unmask PMR before going idle

On Mon, 21 Jan 2019 15:33:28 +0000,
Julien Thierry <julien.thierry@....com> 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: Marc Zyngier <marc.zyngier@....com>

	M.

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