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Subject[patch] x86 supports NO_IRQ convention
Date
Hmm, x86 doesn't seem to support the NO_IRQ convention.  This means
that portable code can't use it. Which in turn means that there's
no portable way for drivers to know whether they have been handed a
valid IRQ number (zero usually being valid). Double-plus ungood.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
---
I suspect this has been discussed before, but I can't find any
written resolution ...

include/asm-x86/irq.h | 4 ++++
1 file changed, 4 insertions(+)

--- a/include/asm-x86/irq.h 2008-06-22 16:36:43.000000000 -0700
+++ b/include/asm-x86/irq.h 2008-06-22 16:37:06.000000000 -0700
@@ -3,3 +3,7 @@
#else
# include "irq_64.h"
#endif
+
+#ifndef NO_IRQ
+#define NO_IRQ ((unsigned int)(-1))
+#endif

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