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

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Message-ID: <51E7236D.3010700@codeaurora.org>
Date:	Wed, 17 Jul 2013 16:06:21 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Javi Merino <javi.merino@....com>,
	"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>
Subject: Re: [PATCH] irqchip: gic: Don't complain in gic_get_cpumask() if
 UP system

On 07/17/13 15:53, Nicolas Pitre wrote:
> On Wed, 17 Jul 2013, Stephen Boyd wrote:
>
>> On 07/17/13 15:34, Nicolas Pitre wrote:
>>> On Wed, 17 Jul 2013, Stephen Boyd wrote:
>>>
>>>> On 07/12/13 05:10, Stephen Boyd wrote:
>>>>> On 07/12, Javi Merino wrote:
>>>>>> I agree, we should drop the check.  It's annoying in uniprocessors and
>>>>>> unlikely to be found in the real world unless your gic entry in the dt
>>>>>> is wrong.
>>> And that's a likely outcome in the real world.
>>>
>>>>> Ok. How about this?
>>>> Any comments?
>>> What about this instead:
>> Unfortunately arm64 doesn't have SMP_ON_UP. 
> And why does that matter?

Because the gic driver is compiled on both arm and arm64? I suppose we
could define is_smp() to 1 on arm64 but its probably better to rely on
generic kernel things instead of arch specific functions.

>
>> It sounds like you preferred the first patch using num_possible_cpus()
> Probably, yes.  I didn't follow the early conversation though.

This was the first patch:

---8<----

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 19ceaa6..589c760 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -368,7 +368,7 @@ 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;


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