[PATCH] irqdesc: Fix missing irq_to_desc export for !CONFIG_SPARSE_IRQ

[Paul Gortmaker]

In allmodconfig builds for sparc and any other arch which does
not set CONFIG_SPARSE_IRQ, the following will be seen at modpost:

  CC [M]  lib/cpu-notifier-error-inject.o
  CC [M]  lib/pm-notifier-error-inject.o
ERROR: "irq_to_desc" [drivers/gpio/gpio-mcp23s08.ko] undefined!
make[2]: *** [__modpost] Error 1

This happens because commit 3911ff30f5d1175e2e67e73244405e3492b35c79
("genirq: export handle_edge_irq() and irq_to_desc()") added one
export for it, but there were actually two instances of it, in
an if/else clause for CONFIG_SPARSE_IRQ.  Add the second one.

Cc: Jiri Kosina <jkosina@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx	# 3.4+
Fixes: 3911ff30f5d1 ("genirq: export handle_edge_irq() and irq_to_desc()")
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 192a302d6cfd..8ab8e9390297 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -274,6 +274,7 @@ struct irq_desc *irq_to_desc(unsigned int irq)
 {
 	return (irq < NR_IRQS) ? irq_desc + irq : NULL;
 }
+EXPORT_SYMBOL(irq_to_desc);
 
 static void free_desc(unsigned int irq)
 {
-- 
1.8.5.2

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