linux-kernel - Re: [PATCH 3/6] Embed zone_id information within the zonelist->zones pointer

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Message-ID: <20070821085423.GC29794@skynet.ie>
Date:	Tue, 21 Aug 2007 09:54:23 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Christoph Lameter <clameter@....com>
Cc:	Lee.Schermerhorn@...com, ak@...e.de, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 3/6] Embed zone_id information within the zonelist->zones pointer

On (17/08/07 14:02), Christoph Lameter didst pronounce:
> On Fri, 17 Aug 2007, Mel Gorman wrote:
> 
> > +/*
> > + * SMP will align zones to a large boundary so the zone ID will fit in the
> > + * least significant biuts. Otherwise, ZONES_SHIFT must be 2 or less to
> > + * fit
> 
> ZONES_SHIFT is always 2 or less....
> 

Yeah, I get that but I was trying for future proof at build time.  However,
there is no need to have dead code on the off-chance it is eventually
used. Failing the compile should be enough so now the check looks like;

+/*
+ * SMP will align zones to a large boundary so the zone ID will fit in the
+ * least significant biuts. Otherwise, ZONES_SHIFT must be 2 or less to
+ * fit. Error if it's not
+ */
+#if (defined(CONFIG_SMP) && INTERNODE_CACHE_SHIFT < ZONES_SHIFT) || \
+	ZONES_SHIFT > 2
+#error There is not enough space to embed zone IDs in the zonelist
+#endif
+

> Acked-by: Christoph Lameter <clameter@....com>
> 

Thanks

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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