[PATCH -tip] x86,apic: Use PAGE_SIZE instead of numbers

[Cyrill Gorcunov]

The whole page is reserved for IO-APIC fixmap
due to non-cacheable requirement. So lets note
this explicitly instead of playing with numbers.

CC: Yinghai Lu <yinghai@xxxxxxxxxx>
CC: "Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
---

Perhaps I miss something and (4 * 1024) have some special
meaning?

 arch/x86/kernel/apic/io_apic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.git/arch/x86/kernel/apic/io_apic.c
=====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6.git/arch/x86/kernel/apic/io_apic.c
@@ -4144,7 +4144,7 @@ fake_ioapic_page:
 		idx++;
 
 		ioapic_res->start = ioapic_phys;
-		ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
+		ioapic_res->end = ioapic_phys + PAGE_SIZE - 1;
 		ioapic_res++;
 	}
 }
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