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Message-ID: <CAH+=+MG=9189mS7+Cb85-PV51EX1Df-zGmZ3u4YtSsEfmphYUQ@mail.gmail.com>
Date: Tue, 4 Sep 2012 17:22:15 +0800
From: yan yan <clouds.yan@...il.com>
To: Cong Wang <xiyou.wangcong@...il.com>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] proc: return -ENOMEM when inode allocation failed
2012/9/4 Cong Wang <xiyou.wangcong@...il.com>:
> On 09/03/2012 10:14 PM, yan wrote:
>>
>> Signed-off-by: yan <clouds.yan@...il.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.
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