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.
next prev parent 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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