linux-kernel - Re: [PATCH v4 04/22] kthread: Add create_kthread

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Message-ID: <20160125185339.GB3628@mtj.duckdns.org>
Date:	Mon, 25 Jan 2016 13:53:39 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Petr Mladek <pmladek@...e.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Borislav Petkov <bp@...e.de>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 04/22] kthread: Add create_kthread_worker*()

On Mon, Jan 25, 2016 at 04:44:53PM +0100, Petr Mladek wrote:
> +struct kthread_worker *
> +create_kthread_worker_on_cpu(int cpu, const char namefmt[])
> +{
> +	if (cpu < 0 || cpu > num_possible_cpus())
> +		return ERR_PTR(-EINVAL);

Comparing cpu ID to num_possible_cpus() doesn't make any sense.  It
should either be testing against cpu_possible_mask or testing against
nr_cpu_ids.  Does this test need to be in this function at all?

Thanks.

-- 
tejun