powerpc: Make SPARSE_IRQ required

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>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 613eacf7f4096be12bb1f021f7b6fd63b5d8ec0a..4eecaaa54451f6c71993d6a7c593791a0db806b8 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -134,6 +134,7 @@ config PPC
        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 GENERIC_IRQ_SHOW
        select GENERIC_IRQ_SHOW_LEVEL

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 01e2877e8e04805694695361326ee0613a502fe1..9b6e80668cfb8209e9d588b912000e41f480d118 100644 (file)
--- 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)