linux-kernel - Re: [PATCH RFC tip/core/rcu 14/14] rcu: Add boosting to TREE_PREEMPT

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Date:	Wed, 23 Feb 2011 11:07:20 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, mingo@...e.hu, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	"Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH RFC tip/core/rcu 14/14] rcu: Add boosting to TREE_PREEMPT_RCU
 tracing

On 02/23/2011 09:39 AM, Paul E. McKenney wrote:
>  	rcudir = debugfs_create_dir("rcu", NULL);
> -	if (!rcudir)
> +	if (IS_ERR_VALUE(rcudir))
>  		goto free_out;

if !defined(CONFIG_DEBUG_FS)
	debugfs_create_xxx() returns ERR_PTR(-ENODEV);
else
	debugfs_create_xxx() returns NULL when failed.

Since TREE_RCU_TRACE selects DEBUG_FS, "if (!rcudir)" is correct,
we don't need to change it.

>  
>  	retval = debugfs_create_file("rcudata", 0444, rcudir,
>  						NULL, &rcudata_fops);
> -	if (!retval)
> +	if (IS_ERR_VALUE(retval))
>  		goto free_out;
>  
>  	retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
>  						NULL, &rcudata_csv_fops);
> -	if (!retval)
> +	if (IS_ERR_VALUE(retval))
> +		goto free_out;
> +
> +	retval = rcu_boost_trace_create_file(rcudir);
> +	if (retval)
>  		goto free_out;
>  
>  	retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
> -	if (!retval)
> +	if (IS_ERR_VALUE(retval))
>  		goto free_out;
>  
>  	retval = debugfs_create_file("rcuhier", 0444, rcudir,
>  						NULL, &rcuhier_fops);
> -	if (!retval)
> +	if (IS_ERR_VALUE(retval))
>  		goto free_out;
>  
>  	retval = debugfs_create_file("rcu_pending", 0444, rcudir,
>  						NULL, &rcu_pending_fops);
> -	if (!retval)
> +	if (IS_ERR_VALUE(retval))
>  		goto free_out;
>  	return 0;
>  free_out:

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