x86: I/O APIC: Include <asm/i8259.h> required by some code
Include <asm/i8259.h> for i8259A_lock used in print_PIC() -- #if-0-ed out by default. The 32-bit version gets it right already. The plan is to enable this code with "apic=debug" eventually. This will aid with debugging strange problems without the need to ask people to apply patches. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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