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

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Message-id: <566E9803.1030409@samsung.com>
Date:	Mon, 14 Dec 2015 11:20:51 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"Suzuki K. Poulose" <suzuki.poulose@....com>,
	Punit Agrawal <punit.agrawal@....com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 01/38] arm-cci: fix handling cpumask_any_but return value

Hi,

Ping - almost three months passed.

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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