[MIPS] Compile __do_IRQ() when really needed

__do_IRQ() is needed only by irq handlers that can't use
default handlers defined in kernel/irq/chip.c.

For others platforms there's no need to compile this function
since it won't be used. For those platforms this patch defines
GENERIC_HARDIRQS_NO__DO_IRQ symbol which is used exactly for
this purpose.

Futhermore for platforms which do not use __do_IRQ(), end()
method which is part of the 'irq_chip' structure is not used.
This patch simply removes this method in this case.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 0 insertions, 5 deletions

diff --git a/arch/mips/sgi-ip27/ip27-timer.c b/arch/mips/sgi-ip27/ip27-timer.c
index 7d361726bbfb..c20e9899b34b 100644
--- a/arch/mips/sgi-ip27/ip27-timer.c
+++ b/arch/mips/sgi-ip27/ip27-timer.c
@@ -180,10 +180,6 @@ static void disable_rt_irq(unsigned int irq)
 {
 }
 
-static void end_rt_irq(unsigned int irq)
-{
-}
-
 static struct irq_chip rt_irq_type = {
         .typename       = "SN HUB RT timer",
         .ack            = disable_rt_irq,
@@ -191,7 +187,6 @@ static struct irq_chip rt_irq_type = {
         .mask_ack       = disable_rt_irq,
         .unmask         = enable_rt_irq,
         .eoi            = enable_rt_irq,
-        .end            = end_rt_irq,
 };
 
 static struct irqaction rt_irqaction = {