netdev - Re: [PATCH net-next v3 3/3] eventpoll: Add epoll ioctl for epoll

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Message-ID: <2024012551-anyone-demeaning-867b@gregkh>
Date: Thu, 25 Jan 2024 15:21:46 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Joe Damato <jdamato@...tly.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	chuck.lever@...cle.com, jlayton@...nel.org,
	linux-api@...r.kernel.org, brauner@...nel.org, edumazet@...gle.com,
	davem@...emloft.net, alexander.duyck@...il.com,
	sridhar.samudrala@...el.com, kuba@...nel.org,
	willemdebruijn.kernel@...il.com, weiwan@...gle.com,
	Jonathan Corbet <corbet@....net>,
	Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nathan Lynch <nathanl@...ux.ibm.com>,
	Steve French <stfrench@...rosoft.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Jiri Slaby <jirislaby@...nel.org>,
	Julien Panis <jpanis@...libre.com>, Arnd Bergmann <arnd@...db.de>,
	Andrew Waterman <waterman@...s.berkeley.edu>,
	Thomas Huth <thuth@...hat.com>, Palmer Dabbelt <palmer@...belt.com>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	"open list:FILESYSTEMS (VFS and infrastructure)" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH net-next v3 3/3] eventpoll: Add epoll ioctl for
 epoll_params

On Thu, Jan 25, 2024 at 10:56:59PM +0000, Joe Damato wrote:
> +struct epoll_params {
> +	u64 busy_poll_usecs;
> +	u16 busy_poll_budget;
> +
> +	/* for future fields */
> +	u8 data[118];
> +} EPOLL_PACKED;

variables that cross the user/kernel boundry need to be __u64, __u16,
and __u8 here.

And why 118?

thanks,

greg k-h