linux-kernel - Re: [PATCH 1/8] cgroups: Add res_counter_write

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Date:	Tue, 9 Aug 2011 19:31:23 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Aditya Kali <adityakali@...gle.com>
Subject: Re: [PATCH 1/8] cgroups: Add res_counter_write_u64() API

On Tue, Aug 09, 2011 at 05:17:39PM +0200, Oleg Nesterov wrote:
> On 07/29, Frederic Weisbecker wrote:
> >
> > +void res_counter_write_u64(struct res_counter *counter, int member, u64 val)
> > +{
> > +	unsigned long long *target;
> > +	unsigned long flags;
> > +
> > +	spin_lock_irqsave(&counter->lock, flags);
> > +	target = res_counter_member(counter, member);
> > +	*target = val;
> > +	spin_unlock_irqrestore(&counter->lock, flags);
> > +}
> 
> Hmm. Why do we need counter->lock?
> 
> OK, probably it is for BITS_PER_LONG < 64. May be it makes sense
> to ifdef, just to make the code more understandable.

Ok, will add that.
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