Message-ID: <4C42BAE5.9020606@cs.helsinki.fi>
Date: Sun, 18 Jul 2010 11:27:17 +0300
From: Pekka Enberg <penberg@cs.helsinki.fi>
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To: Nitin Gupta <ngupta@vflare.org>
CC: Hugh Dickins <hugh.dickins@tiscali.co.uk>,
        Andrew Morton <akpm@linux-foundation.org>, Greg KH <greg@kroah.com>,
        Dan Magenheimer <dan.magenheimer@oracle.com>,
        Rik van Riel <riel@redhat.com>, Avi Kivity <avi@redhat.com>,
        Christoph Hellwig <hch@infradead.org>,
        Minchan Kim <minchan.kim@gmail.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        linux-mm <linux-mm@kvack.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/8] Basic zcache functionality
References: <1279283870-18549-1-git-send-email-ngupta@vflare.org> <1279283870-18549-3-git-send-email-ngupta@vflare.org>
In-Reply-To: <1279283870-18549-3-git-send-email-ngupta@vflare.org>
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Nitin Gupta wrote:
> +static void zcache_add_stat(struct zcache_pool *zpool,
> +		enum zcache_pool_stats_index idx, s64 val)
> +{
> +	struct zcache_pool_stats_cpu *stats;
> +
> +	preempt_disable();
> +	stats = __this_cpu_ptr(zpool->stats);
> +	u64_stats_update_begin(&stats->syncp);
> +	stats->count[idx] += val;
> +	u64_stats_update_end(&stats->syncp);
> +	preempt_enable();
> +
> +}

You should probably use this_cpu_inc() here.
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