MIPS: SGI-IP27: micro-optimize arch_init_irq()

The function sets adjasted groups of bits in hub_irq_map by using
for-loops. There's a bitmap_set() function dedicated to do this.

Because [0, CPU_CALL_B_IRQ] and [NI_BRDCAST_ERR_A, MSC_PANIC_INTR]
ranges belong to the same machine word, bitmap_set() would boil down
to an inline wrapper in both cases, avoiding generating a loop, whth
the associate overhead.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/sgi-ip27/ip27-irq.c b/arch/mips/sgi-ip27/ip27-irq.c
index 8f5299b269e7e7d1b104d6fa4616de4f7fdfc34d..dcb14a234b1c37af425038aa5c15904fbdb6a8b4 100644 (file)
--- a/arch/mips/sgi-ip27/ip27-irq.c
+++ b/arch/mips/sgi-ip27/ip27-irq.c
@@ -286,11 +286,8 @@ void __init arch_init_irq(void)
         * Mark these as reserved right away so they won't be used accidentally
         * later.
         */
-       for (i = 0; i <= CPU_CALL_B_IRQ; i++)
-               set_bit(i, hub_irq_map);
-
-       for (i = NI_BRDCAST_ERR_A; i <= MSC_PANIC_INTR; i++)
-               set_bit(i, hub_irq_map);
+       bitmap_set(hub_irq_map, 0, CPU_CALL_B_IRQ + 1);
+       bitmap_set(hub_irq_map, NI_BRDCAST_ERR_A, MSC_PANIC_INTR - NI_BRDCAST_ERR_A + 1);
 
        fn = irq_domain_alloc_named_fwnode("HUB");
        WARN_ON(fn == NULL);