linux-kernel - Re: [RFC PATCH 10/14] ring_buffer: Fix more races when terminating the producer in the benchmark

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Date:	Mon, 3 Aug 2015 14:33:23 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Petr Mladek <pmladek@...e.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.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>,
	live-patching@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 10/14] ring_buffer: Fix more races when terminating
 the producer in the benchmark

On Tue, 28 Jul 2015 16:39:27 +0200
Petr Mladek <pmladek@...e.com> wrote:

> @@ -384,7 +389,7 @@ static int ring_buffer_consumer_thread(void *arg)
>  
>  static int ring_buffer_producer_thread(void *arg)
>  {
> -	while (!kthread_should_stop() && !kill_test) {
> +	while (!break_test()) {
>  		ring_buffer_reset(buffer);
>  
>  		if (consumer) {
> @@ -393,11 +398,15 @@ static int ring_buffer_producer_thread(void *arg)
>  		}
>  
>  		ring_buffer_producer();
> -		if (kill_test)
> +		if (break_test())
>  			goto out_kill;
>  
>  		trace_printk("Sleeping for 10 secs\n");
>  		set_current_state(TASK_INTERRUPTIBLE);
> +		if (break_test()) {
> +			__set_current_state(TASK_RUNNING);

Move the setting of the current state to after the out_kill label.

-- Steve

> +			goto out_kill;
> +		}
>  		schedule_timeout(HZ * SLEEP_TIME);
>  	}
>  

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