[tip:sched/core] m68k: Fix build warning in mac_via.h

[tip:sched/core] m68k: Fix build warning in mac_via.h

[tip-bot for Peter Zijlstra]

Commit-ID:  54b278b50b8566c227437d6198412cb5a6619e6b
Gitweb:     http://git.kernel.org/tip/54b278b50b8566c227437d6198412cb5a6619e6b
Author:     Peter Zijlstra <peterz@infradead.org>
AuthorDate: Sun, 12 Jan 2014 22:24:56 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 16 Jan 2014 09:27:02 +0100

m68k: Fix build warning in mac_via.h

Fengguang Wu's kbuild test robot reported the following new m68k warnings:

     In file included from drivers/nubus/nubus.c:22:0:
  >> arch/m68k/include/asm/mac_via.h:262:47: warning: 'struct irq_desc' declared inside parameter list [enabled by default]
  >> arch/m68k/include/asm/mac_via.h:262:47: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]

Caused by the reworking of the generic local_bh{dis,en}able() code.

To fix it, forward declare 'struct irq_desc'.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Fixes: c795eb55e740 ("sched/preempt, locking: Rework local_bh_{dis,en}able()")
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: geert@linux-m68k.org
Link: http://lkml.kernel.org/r/20140112212456.GQ7572@laptop.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/m68k/include/asm/mac_via.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/m68k/include/asm/mac_via.h b/arch/m68k/include/asm/mac_via.h
index aeeedf8..fe3fc9a 100644
--- a/arch/m68k/include/asm/mac_via.h
+++ b/arch/m68k/include/asm/mac_via.h
@@ -254,6 +254,8 @@
 extern volatile __u8 *via1,*via2;
 extern int rbv_present,via_alt_mapping;
 
+struct irq_desc;
+
 extern void via_register_interrupts(void);
 extern void via_irq_enable(int);
 extern void via_irq_disable(int);