linux-kernel - Re: [PATCH 01/38] arm-cci: fix handling cpumask_any

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Date:	Mon, 14 Dec 2015 11:42:38 +0000
From:	"Suzuki K. Poulose" <Suzuki.Poulose@....com>
To:	Andrzej Hajda <a.hajda@...sung.com>,
	<linux-kernel@...r.kernel.org>, "Arnd Bergmann" <arnd@...db.de>
CC:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Punit Agrawal <punit.agrawal@....com>,
	"Will Deacon" <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 01/38] arm-cci: fix handling cpumask_any_but return value

On 14/12/15 10:20, Andrzej Hajda wrote:
> Hi,
>
> Ping - almost three months passed.

Andrzej,

The cci patches normally go via the arm-soc tree (which is not quit obvious).
Unfortunately, your post didn't have the maintainers alias - arm@...r.kernel.org -
added (except for Arnd).

Arnd,

What do you recommend ? Should Adrzej send the patch again (with arm@...r.kernel.org in
Cc) or could you pick this one up ?

Regards
Suzuki


>
> Regards
> Andrzej
>
> On 09/21/2015 03:33 PM, Andrzej Hajda wrote:
>> cpumask_any_but returns value >= nr_cpu_ids if there are no more CPUs.
>>
>> The problem has been detected using proposed semantic patch
>> scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].
>>
>> [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576
>>
>> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
>> ---
>>   drivers/bus/arm-cci.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
>> index 577cc4b..22754d0 100644
>> --- a/drivers/bus/arm-cci.c
>> +++ b/drivers/bus/arm-cci.c
>> @@ -1314,7 +1314,7 @@ static int cci_pmu_cpu_notifier(struct notifier_block *self,
>>              if (!cpumask_test_and_clear_cpu(cpu, &cci_pmu->cpus))
>>                      break;
>>              target = cpumask_any_but(cpu_online_mask, cpu);
>> -            if (target < 0) // UP, last CPU
>> +            if (target >= nr_cpu_ids) // UP, last CPU
>>                      break;
>>              /*
>>               * TODO: migrate context once core races on event->ctx have
>
> --
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