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Date: Thu, 16 Mar 2017 15:11:44 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Alexander Duyck <alexander.duyck@...il.com> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, sridhar.samudrala@...el.com, edumazet@...gle.com, davem@...emloft.net Subject: Re: [net-next PATCH 5/5] epoll: Add busy poll support to epoll with socket fds. 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 ))
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