Re: [RFC] Replace the watermark-related union in struct zone with a watermark[] array V2

[KOSAKI Motohiro]

> Changelog since V1
>   o Use N_wmark_pages accessors instead of array accesses
> 
> Patch page-allocator-use-allocation-flags-as-an-index-to-the-zone-watermark
> from -mm added a union to struct zone where the watermarks could be accessed
> with either zone->pages_* or a pages_mark array. The concern was that this
> aliasing caused more confusion that it helped.
> 
> This patch replaces the union with a watermark array that is indexed with
> WMARK_* defines accessed via helpers. All call sites that use zone->pages_*
> are updated to use the helpers for accessing the values and the array
> offsets for setting.
> 
> Signed-off-by: Mel Gorman <mel@xxxxxxxxx>

looks good to me :)




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