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

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Date:   Sun, 21 May 2017 09:00:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Gross <mark.gross@...el.com>, Tejun Heo <tj@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] timers: provide a "modern" variant of timers

On Thu, May 18, 2017 at 10:57:31AM +0200, Arnd Bergmann wrote:
> How expensive would it be to add another field to timer_list and
> just have both pointers?

That would add 4/8 bytes to every structure containing a timer,
so I'd rather avoid it if possible.  But one option might be to
inflict this onto users of outdated compilers and use the union
for modern ones.