[PATCH] kprobes: dont steal interrupts from vm86

This patch fixes the problem reported by Stas Sergeev, that kprobes steals
the virtual-8086 exceptions.  This fix modifies kprobe_handler() to return
0 when in virtual-8086 mode.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/kprobes.c

@@ -117,6 +117,11 @@ static inline int kprobe_handler(struct pt_regs *regs)
 	p = get_kprobe(addr);
 	if (!p) {
 		unlock_kprobes();
+		if (regs->eflags & VM_MASK) {
+			/* We are in virtual-8086 mode. Return 0 */
+			goto no_kprobe;
+		}
+
 		if (*addr != BREAKPOINT_INSTRUCTION) {
 			/*
 			 * The breakpoint instruction was removed right