[tip:irq/urgent] genirq: Add missing irq_to_desc export for CONFIG_SPARSE_IRQ=n

[tip-bot for Paul Gortmaker <tipbot@zytor.com>]

Commit-ID:  2c45aada341121438affc4cb8d5b4cfaa2813d3d
Gitweb:     http://git.kernel.org/tip/2c45aada341121438affc4cb8d5b4cfaa2813d3d
Author:     Paul Gortmaker <paul.gortmaker@windriver.com>
AuthorDate: Mon, 10 Feb 2014 13:39:53 -0500
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 11 Feb 2014 10:30:36 +0100

genirq: Add missing irq_to_desc export for CONFIG_SPARSE_IRQ=n

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 3911ff30f5 ("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.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: stable@vger.kernel.org	# 3.4+
Link: http://lkml.kernel.org/r/1392057610-11514-1-git-send-email-paul.gortmaker@windriver.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 kernel/irq/irqdesc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 192a302..8ab8e93 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)
 {