irqdomain: Replace LEGACY mapping with LINEAR

The LEGACY mapping unnecessarily complicates the irqdomain code and
can easily be implemented with a linear mapping.  By ripping it out
and replacing it with the LINEAR mapping the object size of
irqdomain.c shrinks by about 330 bytes (ARMv7) which offsets the
additional allocation required by the linear map.  It also makes it
possible for current LEGACY map users to pre-allocate irq_descs for a
subset of the hwirqs and dynamically allocate the rest as needed.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index ba2c708adcff..6f062416e5bf 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -95,11 +95,6 @@ struct irq_domain {
         union {
                 struct {
                         unsigned int size;
-                        unsigned int first_irq;
-                        irq_hw_number_t first_hwirq;
-                } legacy;
-                struct {
-                        unsigned int size;
                         unsigned int *revmap;
                 } linear;
                 struct {
@@ -117,8 +112,6 @@ struct irq_domain {
         struct irq_domain_chip_generic *gc;
 };
 
-#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
-                                 * ie. legacy 8259, gets irqs 1..15 */
 #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
 #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
 #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */