From: David S. Miller <davem@davemloft.net>
Date: Fri, 12 Sep 2008 06:36:32 +0000 (-0700)
Subject: sparc64: Define WANT_PAGE_VIRTUAL
X-Git-Tag: v2.6.28-rc1~706^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0f1e7962f93a78630161c7c9fc263de43c101ac;p=pandora-kernel.git

sparc64: Define WANT_PAGE_VIRTUAL

As sparse warns, without this struct page pointer subtraction is
extremely expensive, and this is a pretty common operation in
fast paths.

With this define struct page becomes 64 bytes which makes for a
simple subtract and shift, instead of a costly divide or reciprocol
multiply.

Signed-off-by: David S. Miller <davem@davemloft.net>
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