lguest: documentation III: Drivers
Documentation: The Drivers
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/lguest_bus.h b/include/linux/lguest_bus.h
index c9b4e05..d27853d 100644
--- a/include/linux/lguest_bus.h
+++ b/include/linux/lguest_bus.h
@@ -15,11 +15,14 @@
void *private;
};
-/* By convention, each device can use irq index+1 if it wants to. */
+/*D:380 Since interrupt numbers are arbitrary, we use a convention: each device
+ * can use the interrupt number corresponding to its index. The +1 is because
+ * interrupt 0 is not usable (it's actually the timer interrupt). */
static inline int lgdev_irq(const struct lguest_device *dev)
{
return dev->index + 1;
}
+/*:*/
/* dma args must not be vmalloced! */
void lguest_send_dma(unsigned long key, struct lguest_dma *dma);