linux-kernel - Re: [PATCH 1/3] dcache: add a new enum type for 'dentry_d_lock

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Date:   Fri, 15 Nov 2019 18:02:05 +0800
From:   "yukuai (C)" <yukuai3@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <rafael@...nel.org>, <viro@...iv.linux.org.uk>,
        <rostedt@...dmis.org>, <oleg@...hat.com>,
        <mchehab+samsung@...nel.org>, <corbet@....net>, <tytso@....edu>,
        <jmorris@...ei.org>, <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <zhengbin13@...wei.com>,
        <yi.zhang@...wei.com>, <chenxiang66@...ilicon.com>,
        <xiexiuqi@...wei.com>
Subject: Re: [PATCH 1/3] dcache: add a new enum type for 'dentry_d_lock_class'



On 2019/11/15 11:27, Greg KH wrote:
> On Fri, Nov 15, 2019 at 11:27:50AM +0800, yu kuai wrote:
>> 'dentry_d_lock_class' can be used for spin_lock_nested in case lockdep
>> confused about two different dentry take the 'd_lock'.
>>
>> However, a single 'DENTRY_D_LOCK_NESTED' may not be enough if more than
>> two dentry are involed. So, and in 'DENTRY_D_LOCK_NESTED_2'
>>
>> Signed-off-by: yu kuai <yukuai3@...wei.com>
>> ---
>>   include/linux/dcache.h | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/linux/dcache.h b/include/linux/dcache.h
>> index 10090f1..8eb84ef 100644
>> --- a/include/linux/dcache.h
>> +++ b/include/linux/dcache.h
>> @@ -129,7 +129,8 @@ struct dentry {
>>   enum dentry_d_lock_class
>>   {
>>   	DENTRY_D_LOCK_NORMAL, /* implicitly used by plain spin_lock() APIs. */
>> -	DENTRY_D_LOCK_NESTED
>> +	DENTRY_D_LOCK_NESTED,
>> +	DENTRY_D_LOCK_NESTED_2
> 
> You should document this, as "_2" does not make much sense to anyone
> only looking at the code :(
> 
> Or rename it better.
> 
Thank you for your advise, I'll try to rename it better with comments.

Yu Kuai
> thanks,
> 
> greg k-h
> 
> .
>