[PATCH 14/21] powerpc: Add missing prototype for arch_irq_work_raise

In commit 4f8b50bbbe63 ("irq_work, ppc: Fix up arch hooks") a new function
arch_irq_work_raise was added without a prototype in header irq_work.h.

Fix the following warning (treated as error in W=1):

  CC      arch/powerpc/kernel/time.o
arch/powerpc/kernel/time.c:523:6: error: no previous prototype for ‘arch_irq_work_raise’ [-Werror=missing-prototypes]
 void arch_irq_work_raise(void)
      ^~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: Mathieu Malaterre <redacted>
---
 arch/powerpc/include/asm/irq_work.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/include/asm/irq_work.h b/arch/powerpc/include/asm/irq_work.h
index c6d3078bd8c3..b8b0be8f1a07 100644
--- a/arch/powerpc/include/asm/irq_work.h
+++ b/arch/powerpc/include/asm/irq_work.h

@@ -6,5 +6,6 @@ static inline bool arch_irq_work_has_interrupt(void)
 {
 	return true;
 }
+extern void arch_irq_work_raise(void);
 
 #endif /* _ASM_POWERPC_IRQ_WORK_H */

-- 
2.11.0