linux-kernel - Re: [patch] timer/hrtimer: take per cpu locks in sane order

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Message-Id: <20070302114524.1c61cf22.akpm@linux-foundation.org>
Date:	Fri, 2 Mar 2007 11:45:24 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	john stultz <johnstul@...ibm.com>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Christian Borntraeger <cborntra@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] timer/hrtimer: take per cpu locks in sane order

On Fri, 2 Mar 2007 20:08:36 +0100
Heiko Carstens <heiko.carstens@...ibm.com> wrote:

> +/*
> + * double_hrtimer_lock/unlock are used to ensure that on cpu hotplug the
> + * per cpu timer locks are always taken in the same order.
> + */
> +static void double_hrtimer_lock(struct hrtimer_cpu_base *base1,
> +				struct hrtimer_cpu_base *base2, int ind)
> +	__acquires(base1->lock)
> +	__acquires(base2->lock)
> +{
>
> ...
>
> +/*
> + * double_timer_lock/unlock are used to ensure that on cpu hotplug the
> + * per cpu timer locks are always taken in the same order.
> + */
> +static void __devinit double_timer_lock(tvec_base_t *base1,
> +					tvec_base_t *base2, int ind)
> +	__acquires(base1->lock)
> +	__acquires(base2->lock)

hm.  Can we not just pass in the spinlock_t*'s and use a common function?

	void double_spin_lock(spinlock_t *l1, spinlock_t *l2, int ind);

that way it has nothing to do with timers and can potentially be used
elsewhere in the kernel, too.

(what does "ind" mean?)
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