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

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Date:	Fri, 2 Mar 2007 22:39:59 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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

> > +/*
> > + * 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?)

Sure. Will put a static inline function into include/linux/spinlock.h.
"ind" is supposed to be the short form of "indicator".
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