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

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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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H. Peter Anvin 2010-01-04 21:14:41 -08:00

parent 99d113b17e

commit ea94396629

2 changed files with 7 additions and 5 deletions

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9

arch/x86/include/asm/irq_vectors.h

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3

arch/x86/kernel/apic/io_apic.c

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