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

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Message-ID: <20130723170153.GA27761@codeaurora.org>
Date:	Tue, 23 Jul 2013 10:01:53 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	"Bedia, Vaibhav" <vaibhav.bedia@...com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nicolas Pitre <nico@...aro.org>
Subject: Re: [PATCH] irqchip: gic: Don't complain in gic_get_cpumask() if
 UP system

On 07/20, Bedia, Vaibhav wrote:
> Hi,
> 
> On Sat, Jul 06, 2013 at 05:09:33, 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.
> > 
> > Cc: Nicolas Pitre <nico@...aro.org>
> > Cc: Russell King <rmk+kernel@....linux.org.uk>
> > Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> > ---
> > 
> > Maybe we should just drop the check entirely? It looks like it may
> > just be debug code that won't ever trigger in practice, even on the
> > 11MPCore that caused this code to be introduced.
> > 
> 
> Apologies if I missed v2 of this patch if there was one. I could not
> locate it in my inbox or the list archives.
> 
> We have a yet to be released single-core A9 MPCore system (AM437x) which
> needs to co-exist in omap2plus_defconfig wherein NR_CPUS is set to 2. 
> This currently leads to the "GIC CPU mask not found..." being printed
> twice during bootup. If the check is really some debug code, can it be
> completely dropped?

I have sent both versions of the patch in hopes that one or the
other will be accepted. Either way works for me.

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