linux-kernel - Re: [PATCH -tip 3/3] locking/pvqspinlock: Robustify init_qspinlock

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Date:	Mon, 18 Apr 2016 09:16:50 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	mingo@...nel.org, peterz@...radead.org
Cc:	waiman.long@....com, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH -tip 3/3] locking/pvqspinlock: Robustify
 init_qspinlock_stat()

On Sun, 17 Apr 2016, Davidlohr Bueso wrote:

>diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h
>index 72722334237a..ddcd653c942c 100644
>--- a/kernel/locking/qspinlock_stat.h
>+++ b/kernel/locking/qspinlock_stat.h
>@@ -225,12 +225,18 @@ static int __init init_qspinlock_stat(void)
> 	 * performance.
> 	 */
> 	for (i = 0; i < qstat_num; i++)
>-		debugfs_create_file(qstat_names[i], 0400, d_qstat,
>-				   (void *)(long)i, &fops_qstat);
>+		if (!debugfs_create_file(qstat_names[i], 0400, d_qstat,
>+					 (void *)(long)i, &fops_qstat))
>+			goto fail;
>+
>+	if (!debugfs_create_file(qstat_names[qstat_reset_cnts], 0200, d_qstat,
>+				 (void *)(long)qstat_reset_cnts, &fops_qstat))
>+		goto fail;
>
>-	debugfs_create_file(qstat_names[qstat_reset_cnts], 0200, d_qstat,
>-			   (void *)(long)qstat_reset_cnts, &fops_qstat);
> 	return 0;
>+fail:
>+	debugfs_remove_recursive(d_qstat);
>+	return 1;

Hmm actually if debugfs_create_dir() fails firstly, we still return 0, Waiman, did
you mean 1 there, no?

Thanks,
Davidlohr