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Re: [net-next PATCH 5/5] epoll: Add busy poll support to epoll with socket fds.




On Thu, Mar 16, 2017 at 3:11 PM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> On Thu, 2017-03-16 at 11:33 -0700, Alexander Duyck wrote:
>> From: Sridhar Samudrala <sridhar.samudrala@xxxxxxxxx>
>
>> +/*
>> + * If busy polling is on and the file is a socket, return a pointer to
>> + * struct sock
>> + */
>> +static inline struct sock *ep_sk_from_file(struct file *file)
>> +{
>> +     struct inode *inode = file_inode(file);
>> +
>> +     if (!S_ISSOCK(inode->i_mode))
>> +             return NULL;
>> +
>> +     return ((struct socket *)file->private_data)->sk;
>> +}
>
> I believe a more standard way is to use sock_from_file()
>
> (This does not have to fetch a cache line to read i_mode ))

Thanks.  Will make sure to update to use that for v2.

- Alex