x86: make HAVE_SPARSE_IRQ support selectable

Ingo said sparse_irq is some intrusive. need to make it selectable

to make it simple, remove irq_desc as parameter in some functions.
(ack, eoi, set_affinity).
may need to make member if irq_chip to take irq_desc, or struct irq later.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b157e94637bf..600584b7a497 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -34,7 +34,6 @@ config X86
         select HAVE_GENERIC_DMA_COHERENT if X86_32
         select HAVE_EFFICIENT_UNALIGNED_ACCESS
         select HAVE_DYN_ARRAY
-        select HAVE_SPARSE_IRQ
 
 config ARCH_DEFCONFIG
         string
@@ -238,6 +237,17 @@ config SMP
 
           If you don't know what to do here, say N.
 
+config HAVE_SPARSE_IRQ
+        bool "Support sparse irq numbering"
+        depends on PCI_MSI || HT_IRQ
+        default y
+        help
+          This enables support for sparse irq, esp for msi/msi-x. the irq
+          number will be bus/dev/fn + 12bit. You may need if you have lots of
+          cards supports msi-x installed.
+
+          If you don't know what to do here, say Y.
+
 config X86_FIND_SMP_CONFIG
         def_bool y
         depends on X86_MPPARSE || X86_VOYAGER