Re: [PATCH 6/6] memcg: make mem_cgroup_page_stat() return value unsigned

[Wu Fengguang <fengguang.wu@intel.com>]

On Tue, Nov 09, 2010 at 05:24:31PM +0800, Greg Thelen wrote:
> mem_cgroup_page_stat() used to return a negative page count
> value to indicate value.
> 
> mem_cgroup_page_stat() has changed so it never returns
> error so convert the return value to the traditional page
> count type (unsigned long).
> 
> Signed-off-by: Greg Thelen <gthelen@google.com>
> ---

> +	/*
> +	 * The sum of unlocked per-cpu counters may yield a slightly negative
> +	 * value.  This function returns an unsigned value, so round it up to
> +	 * zero to avoid returning a very large value.
> +	 */
> +	if (value < 0)
> +		value = 0;

nitpick: it's good candidate for unlikely().

Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>

Sorry, I lose track to the source code after so many patches.
It would help if you can put the patches to a git tree.

Thanks,
Fengguang