patch-2.1.101 linux/include/asm-i386/hardirq.h

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diff -u --recursive --new-file v2.1.100/linux/include/asm-i386/hardirq.h linux/include/asm-i386/hardirq.h
@@ -5,6 +5,12 @@
 
 extern unsigned int local_irq_count[NR_CPUS];
 
+/*
+ * Are we in an interrupt context? Either doing bottom half
+ * or hardware interrupt processing?
+ */
+#define in_interrupt() (local_irq_count[smp_processor_id()] + local_bh_count[smp_processor_id()] != 0)
+
 #ifndef __SMP__
 
 #define hardirq_trylock(cpu)	(local_irq_count[cpu] == 0)

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