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

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Message-ID: <CAKgT0UfwxL4tG+XJAsqx+AW_LtMuLCqYZYh+uJXRnYN13MTXJA@mail.gmail.com>
Date:   Thu, 16 Mar 2017 15:38:39 -0700
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: 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@...il.com> wrote:
> On Thu, 2017-03-16 at 11:33 -0700, Alexander Duyck wrote:
>> From: Sridhar Samudrala <sridhar.samudrala@...el.com>
>
>> +/*
>> + * 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