linux-kernel - Re: [PATCH 2/9] timers: provide a "modern" variant of timers

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Message-ID: <20170521065749.GA13052@lst.de>
Date:   Sun, 21 May 2017 08:57:49 +0200
From:   'Christoph Hellwig' <hch@....de>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Christoph Hellwig' <hch@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tejun Heo <tj@...nel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Mark Gross <mark.gross@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>
Subject: Re: [PATCH 2/9] timers: provide a "modern" variant of timers

On Fri, May 19, 2017 at 10:48:51AM +0000, David Laight wrote:
> From: Christoph Hellwig
> > Sent: 16 May 2017 12:48
> >
> > The new callback gets a pointer to the timer_list itself, which can
> > then be used to get the containing structure using container_of
> > instead of casting from and to unsigned long all the time.
> 
> What about sensible drivers that put some other value in the 'data'
> field?

They will add the equivalent of the data field into the containing
structure of the timer.  Just like we do for all other kernel interfaces
using the container_of patter, which includes just about every
primitive designed in the last 15 years.