linux-kernel - Re: [PATCH 1/3] use lock for 64-bit stats

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Message-ID: <4B605779.9010500@cs.helsinki.fi>
Date:	Wed, 27 Jan 2010 17:10:49 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Nitin Gupta <ngupta@...are.org>
CC:	Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] use lock for 64-bit stats

Nitin Gupta wrote:
> +static void stat_dec(u32 *v)
> +{
> +	*v = *v - 1;
> +}
> +
> +static void stat64_inc(struct ramzswap *rzs, u64 *v)
> +{
> +	spin_lock(&rzs->stat64_lock);
> +	*v = *v + 1;
> +	spin_unlock(&rzs->stat64_lock);
> +}
> +
> +static void stat64_dec(struct ramzswap *rzs, u64 *v)
> +{
> +	spin_lock(&rzs->stat64_lock);
> +	*v = *v - 1;
> +	spin_unlock(&rzs->stat64_lock);
> +}
> +
> +static u64 stat64_read(struct ramzswap *rzs, u64 *v)
> +{
> +	u64 val;
> +
> +	spin_lock(&rzs->stat64_lock);
> +	val = *v;
> +	spin_unlock(&rzs->stat64_lock);
> +
> +	return val;
> +}
> +#else
> +#define stat_inc(v)
> +#define stat_dec(v)
> +#define stat64_inc(r, v)
> +#define stat64_dec(r, v)
> +#define stat64_read(r, v)
> +#endif /* CONFIG_RAMZSWAP_STATS */

I think I complained about this before: the names are too generic and 
could collide with core kernel code. I think they ought to be called 
ramzsawp_stat*().

			Pekka
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