[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, 7 deletions

diff --git a/arch/mips/lasat/interrupt.c b/arch/mips/lasat/interrupt.c
index 4a84a7beac53..2affa5ff171c 100644
--- a/arch/mips/lasat/interrupt.c
+++ b/arch/mips/lasat/interrupt.c
@@ -44,19 +44,12 @@ void enable_lasat_irq(unsigned int irq_nr)
         *lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
 }
 
-static void end_lasat_irq(unsigned int irq)
-{
-        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
-                enable_lasat_irq(irq);
-}
-
 static struct irq_chip lasat_irq_type = {
         .typename = "Lasat",
         .ack = disable_lasat_irq,
         .mask = disable_lasat_irq,
         .mask_ack = disable_lasat_irq,
         .unmask = enable_lasat_irq,
-        .end = end_lasat_irq,
 };
 
 static inline int ls1bit32(unsigned int x)