linux-kernel - Re: [PATCH] interconnect: Fix a GCC compiler warning

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Message-ID: <5B9F7196.1070203@huawei.com>
Date:   Mon, 17 Sep 2018 17:19:18 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <georgi.djakov@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] interconnect: Fix a GCC compiler warning

On 2018/9/17 16:59, Greg KH wrote:
> On Mon, Sep 17, 2018 at 04:53:31PM +0800, zhong jiang wrote:
>> +to Greg and Andrew.
>>
>> On 2018/9/16 22:31, zhong jiang wrote:
>>> Fix the following compile warning:
>>>
>>> drivers/interconnect/core.c:26:23: warning: 'icc_debugfs_dir' defined but not used [-Wunused-variable]
>>>  static struct dentry *icc_debugfs_dir;
>>>
>>> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
>>> ---
>>>  drivers/interconnect/core.c | 3 +++
> This file is not in a released tree, where are you seeing it?
I see it in linux-next.
>>>  1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
>>> index 2740f1a..9ea9959 100644
>>> --- a/drivers/interconnect/core.c
>>> +++ b/drivers/interconnect/core.c
>>> @@ -23,7 +23,10 @@
>>>  static DEFINE_IDR(icc_idr);
>>>  static LIST_HEAD(icc_provider_list);
>>>  static DEFINE_MUTEX(icc_lock);
>>> +
>>> +#ifdef CONFIG_DEBUG_FS
>>>  static struct dentry *icc_debugfs_dir;
>>> +#endif
> Why not move the variable to where it is used?  It should be able to go
> under an existing #ifdef section, right?
Because the variable need to be used in __init and __exit.  So it should be identified as
a gloabl variable.  I fix it under the #ifdef condition.

Thanks,
zhong jiang
> thanks,
>
> greg k-h
>
> .
>