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From: yan yan <clouds.yan@gmail.com>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] proc: return -ENOMEM when inode allocation failed
Date: Tue, 4 Sep 2012 17:22:15 +0800	[thread overview]
Message-ID: <CAH+=+MG=9189mS7+Cb85-PV51EX1Df-zGmZ3u4YtSsEfmphYUQ@mail.gmail.com> (raw)
In-Reply-To: <50456F2E.6060408@gmail.com>

2012/9/4 Cong Wang <xiyou.wangcong@gmail.com>:
> On 09/03/2012 10:14 PM, yan wrote:
>>
>> Signed-off-by: yan <clouds.yan@gmail.com>
>
>
> Please provide a changelog to explain why we need this patch.

I think the title is self explained.


>> ---
>>   fs/proc/generic.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/proc/generic.c b/fs/proc/generic.c
>> index b3647fe..9e8f631 100644
>> --- a/fs/proc/generic.c
>> +++ b/fs/proc/generic.c
>> @@ -427,7 +427,7 @@ struct dentry *proc_lookup_de(struct proc_dir_entry
>> *de, struct inode *dir,
>>                 if (!memcmp(dentry->d_name.name, de->name, de->namelen)) {
>>                         pde_get(de);
>>                         spin_unlock(&proc_subdir_lock);
>> -                       error = -EINVAL;
>> +                       error = -ENOMEM;
>
>
> Why the !memcmp() case is related with ENOMEM ??

We are presetting 'error' here. The following proc_get_inode() will try
to get an inode, either from inode cache or allocate a new one (and fill it).

If we get a NULL inode, that means allocation failed. That's how
ENOMEM involved.

Thank you for your reply.

  reply	other threads:[~2012-09-04  9:22 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-03 14:14 [PATCH 0/3] Trivial code clean for procfs yan
2012-09-03 14:14 ` [PATCH 1/3] proc: return -ENOMEM when inode allocation failed yan
2012-09-04  0:38   ` Ryan Mallon
2012-09-04  3:02   ` Cong Wang
2012-09-04  9:22     ` yan yan [this message]
2012-09-04 22:41       ` Andrew Morton
2012-09-05  7:15       ` Cong Wang
2012-09-05  7:57         ` yan yan
2012-09-03 14:14 ` [PATCH 2/3] proc : no need to initialize proc_inode->fd in proc_get_inode yan
2012-09-04 22:49   ` Andrew Morton
2012-09-03 14:14 ` [PATCH 3/3] proc: use kzalloc instead of kmalloc and memset yan
2012-09-04  0:44   ` Ryan Mallon
2012-09-04  9:10     ` yan yan

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