linux-kernel - Re: [PATCH] irqchip: gic: Don't complain in gic_get

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Date:	Wed, 11 Feb 2015 21:51:50 -0600
From:	Nishanth Menon <nm@...com>
To:	Felipe Balbi <balbi@...com>
CC:	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Stefan Agner <stefan@...er.ch>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] irqchip: gic: Don't complain in gic_get_cpumask() if UP
 system

On 01:09-20150131, Felipe Balbi wrote:
> +linux-omap
> 
> On Fri, Jan 30, 2015 at 04:43:30PM -0800, Stephen Boyd wrote:
> > In a uniprocessor implementation the interrupt processor targets
> > registers are read-as-zero/write-ignored (RAZ/WI). Unfortunately
> > gic_get_cpumask() will print a critical message saying
> > 
> >  GIC CPU mask not found - kernel will fail to boot.
> > 
> > if these registers all read as zero, but there won't actually be
> > a problem on uniprocessor systems and the kernel will boot just
> > fine. Skip this check if we're running a UP kernel or if we
> > detect that the hardware only supports a single processor.
> > 
> 
> Nice, I'll test this on AM437x on Monday but certainly looks promising:
> 
> Acked-by: Felipe Balbi <balbi@...com>
> 
> 
> > Acked-by: Nicolas Pitre <nico@...aro.org>
> > Cc: Russell King <rmk+kernel@....linux.org.uk>
> > Cc: Stefan Agner <stefan@...er.ch>
> > Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> > ---
> >  drivers/irqchip/irq-gic.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> > index d617ee5a3d8a..1b70e0de0f6e 100644
> > --- a/drivers/irqchip/irq-gic.c
> > +++ b/drivers/irqchip/irq-gic.c
> > @@ -346,7 +346,7 @@ static u8 gic_get_cpumask(struct gic_chip_data *gic)
> >  			break;
> >  	}
> >  
> > -	if (!mask)
> > +	if (!mask && num_possible_cpus() > 1)
> >  		pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
> >  
> >  	return mask;
> > -- 
> > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> > a Linux Foundation Collaborative Project
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> > Please read the FAQ at  http://www.tux.org/lkml/
> 
> -- 
> balbi

Acked-by: Nishanth Menon <nm@...com>
-- 
Regards,
Nishanth Menon
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