linux-kernel - Re: [PATCH 1/5] arm64: entry: isb in el1

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Message-ID: <20180406173450.5h7lgh2xdtcs5fbs@lakrids.cambridge.arm.com>
Date:   Fri, 6 Apr 2018 18:34:50 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     James Morse <james.morse@....com>
Cc:     Yury Norov <ynorov@...iumnetworks.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Will Deacon <will.deacon@....com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Christopher Lameter <cl@...ux.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Alexey Klimov <klimov.linux@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] arm64: entry: isb in el1_irq

On Fri, Apr 06, 2018 at 06:30:50PM +0100, James Morse wrote:
> Hi Mark,
> 
> On 06/04/18 18:22, Mark Rutland wrote:
> > Digging a bit, I also thing that our ct_user_exit and ct_user_enter
> > usage is on dodgy ground today.
> 
> [...]
> 
> > I think similar applies to SDEI; we don't negotiate with RCU prior to
> > invoking handlers, which might need RCU.
> 
> The arch code's __sdei_handler() calls nmi_enter() -> rcu_nmi_enter(), which
> does a rcu_dynticks_eqs_exit().

Ah, sorry. I missed that!

Thanks,
Mark.