Re: [PATCH 11/12] mm: per device dirty threshold

> +static inline unsigned long bdi_stat_delta(void)
> +{
> +#ifdef CONFIG_SMP
> +	return NR_CPUS * FBC_BATCH;

Shouln't this be multiplied by the number of counters to sum?  I.e. 3
if dirty and unstable are separate, and 2 if they are not.

Miklos
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