From: H. Peter Anvin <hpa@zytor.com>
Date: Tue, 5 Jan 2010 05:14:41 +0000 (-0800)
Subject: x86, apic: Don't waste a vector to improve vector spread
X-Git-Tag: v2.6.34-rc1~217^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea94396629a3e0cb9a3a9c75335b1de255b30426;p=pandora-kernel.git

x86, apic: Don't waste a vector to improve vector spread

We want to use a vector-assignment sequence that avoids stumbling onto
0x80 earlier in the sequence, in order to improve the spread of
vectors across priority levels on machines with a small number of
interrupt sources.  Right now, this is done by simply making the first
vector (0x31 or 0x41) completely unusable.  This is unnecessary; all
we need is to start assignment at a +1 offset, we don't actually need
to prohibit the usage of this vector once we have wrapped around.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <4B426550.6000209@kernel.org>
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