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Date: Mon, 28 Nov 2011 01:42:55 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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Subject: array index of '-16' indexes before the beginning of the array
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Looks like clang has found a real issue here:
/usr/src/sys/x86/x86/local_apic.c:311:2: warning: array index of '-16' indexes
before the beginning of the array [-Warray-bounds]
        lapics[apic_id].la_ioint_irqs[IDT_DTRACE_RET - APIC_IO_INTS] =
IRQ_DTRACE_RET;

IDT_DTRACE_RET (0x20) indeed seems to be less than APIC_IO_INTS.

-- 
Andriy Gapon