linux-kernel - Re: [PATCH] plist: add mutex to the blessed lock type for plists

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Date:	Wed, 29 Jun 2011 13:10:39 -0700
From:	Dima Zavin <dima@...roid.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Lai Jiangshan <laijs@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] plist: add mutex to the blessed lock type for plists

On Wed, Jun 29, 2011 at 1:01 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Wed, 2011-06-29 at 12:33 -0700, Dima Zavin wrote:
>
>> +#include <linux/mutex.h>
>>  #include <linux/plist.h>
>>  #include <linux/spinlock.h>
>>
>> @@ -56,11 +57,14 @@ static void plist_check_list(struct list_head *top)
>>
>>  static void plist_check_head(struct plist_head *head)
>>  {
>> -     WARN_ON(head != &test_head && !head->rawlock && !head->spinlock);
>> +     WARN_ON(head != &test_head && !head->rawlock && !head->spinlock &&
>> +             !head->mutex);
>>       if (head->rawlock)
>>               WARN_ON_SMP(!raw_spin_is_locked(head->rawlock));
>>       if (head->spinlock)
>>               WARN_ON_SMP(!spin_is_locked(head->spinlock));
>> +     if (head->mutex)
>> +             WARN_ON_SMP(!mutex_is_locked(head->mutex));
>
> Spin locks are NOPs on SMP, but mutexes are not. Are you sure you want
> this as WARN_ON_SMP()?

Doh. Copy-pasty-itis.. Will switch to plain WARN_ON.

--Dima


>
> -- Steve
>
>>       if (!plist_head_empty(head))
>>               plist_check_list(&plist_first(head)->prio_list);
>>       plist_check_list(&head->node_list);
>
>
>
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