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Subject[RFC] powerpc: Make SPARSE_IRQ required
Date
All IRQs on powerpc are managed via irq_domain anyway, there isn't really
any advantage to turning SPARSE_IRQ off, and it's the direction we want
to take the kernel design anyway. This patch makes powerpc always use
SPARSE_IRQ.

On pseries_defconfig, SPARSE_IRQ adds only about 0x300 bytes to the
.text sections, and removes about 0x20000 from the data section for the
static irq_desc table.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Ben Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/kernel/irq.c | 4 ----
2 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 303703d..1aa840d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -133,7 +133,7 @@ config PPC
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
select HAVE_GENERIC_HARDIRQS
- select HAVE_SPARSE_IRQ
+ select SPARSE_IRQ
select IRQ_PER_CPU
select IRQ_DOMAIN
select GENERIC_IRQ_SHOW
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index e3673ff..282fb39 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -93,10 +93,6 @@ extern int tau_interrupts(int);

#ifdef CONFIG_PPC64

-#ifndef CONFIG_SPARSE_IRQ
-EXPORT_SYMBOL(irq_desc);
-#endif
-
int distribute_irqs = 1;

static inline notrace unsigned long get_hard_enabled(void)
--
1.7.5.4


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