linux-ext4 - Re: [PATCH, RFC] percpu_counters: make fbc->count read atomic on 32 bit architecture

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Message-ID: <48EB97B2.3010406@rsk.demon.co.uk>
Date:	Tue, 07 Oct 2008 18:09:06 +0100
From:	richard kennedy <richard@....demon.co.uk>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Ts'o <tytso@....edu>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC] percpu_counters: make fbc->count read atomic on
   32 bit architecture

Peter Zijlstra wrote:
....
> +static inline int atomic64_dec_and_test(atomic64_t *v)
> +{
> +	int ret;
> +
> +	write_seqlock(&v->slock);
> +	v->counter--;
> +	ret = !v->counter;
> +	write_sequnlock(&v->slock);
> +
> +	return ret;
> +}
> +
> +static inline int atomic64_add_and_test(atomic64_t *v)
> +{
> +	int ret;
> +
> +	write_seqlock(&v->slock);
> +	v->counter++;
> +	ret = !v->counter;
> +	write_sequnlock(&v->slock);
> +
> +	return ret;
> +}
would it be more logical to call this atomic64_inc_and_test to match the
above dec_and_test ?

regards
Richard
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