linux-kernel - Re: [PATCH] btrfs: list usage cleanup

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Date:   Thu, 4 Oct 2018 11:25:44 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <dsterba@...e.cz>, Omar Sandoval <osandov@...ndov.com>,
        <dsterba@...e.com>, <jbacik@...com>, <clm@...com>,
        <linux-btrfs@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] btrfs: list usage cleanup

On 2018/10/2 0:48, David Sterba wrote:
> On Thu, Sep 27, 2018 at 11:47:04AM -0700, Omar Sandoval wrote:
>> On Wed, Sep 26, 2018 at 04:35:45PM +0800, zhong jiang wrote:
>>> Trival cleanup, list_move_tail will implement the same function that
>>> list_del() + list_add_tail() will do. hence just replace them.
>>>
>>> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
>>> ---
>>>  fs/btrfs/send.c | 3 +--
>>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>>
>>> diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
>>> index 094cc144..d87f416 100644
>>> --- a/fs/btrfs/send.c
>>> +++ b/fs/btrfs/send.c
>>> @@ -2075,8 +2075,7 @@ static struct name_cache_entry *name_cache_search(struct send_ctx *sctx,
>>>   */
>>>  static void name_cache_used(struct send_ctx *sctx, struct name_cache_entry *nce)
>>>  {
>>> -	list_del(&nce->list);
>>> -	list_add_tail(&nce->list, &sctx->name_cache_list);
>>> +	list_move_tail(&nce->list, &sctx->name_cache_list);
>>>  }
>> At that point do we even need such a trivial helper, considering that
>> this is only called in one place?
> Fair point and trivial one-line helpers are on the cleanup todo list.
> The exception is when the actual helper implementation is obscuring the
> semantics and the helper is used in many places so it's not practical to
> add a comment everywhere. But it's not the case here.
>
> Zhong Jiang, please update the patch and resend, thanks.
Will add a comment here and resend in v2.

Thanks,
zhong jiang
> .
>