> It's defined in hardirq.h.

Yes, I was asleep at the wheel.  :(

---
From: Randy Dunlap <randy.dunlap@oracle.com>

Fix em28xx build by adding hardirq.h header file:

drivers/media/video/em28xx/em28xx-vbi.c:49: error: implicit declaration of function 'in_interrupt'

Reported-by: Zimny Lech <napohybelskurwysynom2010@gmail.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
---
 drivers/media/video/em28xx/em28xx-vbi.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20101207.orig/drivers/media/video/em28xx/em28xx-vbi.c
+++ linux-next-20101207/drivers/media/video/em28xx/em28xx-vbi.c
@@ -23,6 +23,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/hardirq.h>
 #include <linux/init.h>
 
 #include "em28xx.h"
--
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