linux-kernel - Re: [PATCH v2 4/4] KVM: arm/arm64: vgic: Make vgic_cpu->ap_list_lock a raw

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Message-ID: <20181211103232.GW30263@e113682-lin.lund.arm.com>
Date:   Tue, 11 Dec 2018 11:32:32 +0100
From:   Christoffer Dall <christoffer.dall@....com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        marc.zyngier@....com, linux-arm-kernel@...ts.infradead.org,
        linux-rt-users@...r.kernel.org, tglx@...utronix.de,
        rostedt@...dmis.org, bigeasy@...utronix.de
Subject: Re: [PATCH v2 4/4] KVM: arm/arm64: vgic: Make vgic_cpu->ap_list_lock
 a raw_spinlock

On Mon, Nov 26, 2018 at 06:26:47PM +0000, Julien Thierry wrote:
> vgic_cpu->ap_list_lock must always be taken with interrupts disabled as
> it is used in interrupt context.
> 
> For configurations such as PREEMPT_RT_FULL, this means that it should
> be a raw_spinlock since RT spinlocks are interruptible.
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Cc: Christoffer Dall <christoffer.dall@....com>
> Cc: Marc Zyngier <marc.zyngier@....com>


Acked-by: Christoffer Dall <christoffer.dall@....com>