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

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Message-ID: <20110809151739.GB15311@redhat.com>
Date:	Tue, 9 Aug 2011 17:17:39 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.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 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.

Oleg.

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