x86, apic: Use PAGE_SIZE instead of numbers
The whole page is reserved for IO-APIC fixmap due to non-cacheable requirement. So lets note this explicitly instead of playing with numbers. Signed-off-by: NCyrill Gorcunov <gorcunov@openvz.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Maciej W. Rozycki <macro@linux-mips.org> LKML-Reference: <20091108155356.GB25940@lenovo> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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