[POWERPC] iSeries: fix irq.c for combined build

[Stephen Rothwell]

Signed-off-by: Stephen Rothwell <sfr at canb.auug.org.au>
---
 arch/powerpc/kernel/irq.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

This version will build on 32bit.

Cheers,
Stephen Rothwell

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index eb9fc62..e193695 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -268,7 +268,8 @@ void do_IRQ(struct pt_regs *regs)
 	set_irq_regs(old_regs);
 
 #ifdef CONFIG_PPC_ISERIES
-	if (get_lppaca()->int_dword.fields.decr_int) {
+	if (firmware_has_feature(FW_FEATURE_ISERIES) &&
+			get_lppaca()->int_dword.fields.decr_int) {
 		get_lppaca()->int_dword.fields.decr_int = 0;
 		/* Signal a fake decrementer interrupt */
 		timer_interrupt(regs);
-- 
1.4.3.5