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Date: Mon, 17 Feb 2020 17:11:47 +0800 From: Zenghui Yu <yuzenghui@...wei.com> To: Marc Zyngier <maz@...nel.org>, <linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org> CC: Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Jason Cooper <jason@...edaemon.net>, Robert Richter <rrichter@...vell.com>, "Thomas Gleixner" <tglx@...utronix.de>, Eric Auger <eric.auger@...hat.com>, "James Morse" <james.morse@....com>, Julien Thierry <julien.thierry.kdev@...il.com>, Suzuki K Poulose <suzuki.poulose@....com> Subject: Re: [PATCH v4 01/20] irqchip/gic-v4.1: Skip absent CPUs while iterating over redistributors Hi Marc, On 2020/2/14 22:57, Marc Zyngier wrote: > In a system that is only sparsly populated with CPUs, we can end-up with > redistributors structures that are not initialized. Let's make sure we > don't try and access those when iterating over them (in this case when > checking we have a L2 VPE table). > > Fixes: 4e6437f12d6e ("irqchip/gic-v4.1: Ensure L2 vPE table is allocated at RD level") > Signed-off-by: Marc Zyngier <maz@...nel.org> > --- > drivers/irqchip/irq-gic-v3-its.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c > index 83b1186ffcad..da883a691028 100644 > --- a/drivers/irqchip/irq-gic-v3-its.c > +++ b/drivers/irqchip/irq-gic-v3-its.c > @@ -2452,6 +2452,10 @@ static bool allocate_vpe_l2_table(int cpu, u32 id) > if (!gic_rdists->has_rvpeid) > return true; > > + /* Skip non-present CPUs */ > + if (!base) > + return true; > + Thanks for fixing this, Reviewed-by: Zenghui Yu <yuzenghui@...wei.com> > val = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER); > > esz = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val) + 1; >
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