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authorThomas Gleixner <tglx@linutronix.de>2014-05-07 15:44:05 +0000
committerThomas Gleixner <tglx@linutronix.de>2014-05-16 14:05:18 +0200
commit7b6ef1262549f6afc5c881aaef80beb8fd15f908 (patch)
treec773a3d7dc6fcaa5aa9ba35074312f728d7dce40 /kernel/irq/Kconfig
parent465665f78a7f47d46d7fe18195f3548b4911547f (diff)
downloadlinux-stericsson-7b6ef1262549f6afc5c881aaef80beb8fd15f908.tar.gz
genirq: Provide generic hwirq allocation facility
Not really the solution to the problem, but at least it confines the mess in the core code and allows to get rid of the create/destroy_irq variants from hell, i.e. 3 implementations with different semantics plus the x86 specific variants __create_irqs and create_irq_nr which have been invented in another circle of hell. x86 : x86 should be converted to irq domains and I'm deliberately making it impossible to do the multi-vector MSI support by adding more crap to the current mess. It's not that hard to do and I'm really tired of the trainwrecks which have been invented by baindaid engineering so far. Any attempt to do multi-vector MSI or ioapic hotplug without converting to irq domains is NAKed hereby. tile: Might use irq domains as well, but it has a very limited interrupt space, so handling it via this functionality might be the right thing to do even in the long run. ia64: That's an hopeless case, as I doubt that anyone has the stomach to rewrite the homebrewn dynamic allocation facilities. I stared at it for a couple of hours and gave up. The create/destroy_irq mess could be made private to itanic right away if there wouldn't be the iommu/dmar driver being shared with x86. So to do that I'm going to add a separate ia64 specific implementation later in order not to deep-six itanic right away. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Grant Likely <grant.likely@linaro.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: x86@kernel.org Link: http://lkml.kernel.org/r/20140507154334.208629358@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq/Kconfig')
-rw-r--r--kernel/irq/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index 07cbdfea9ae2..a83f10e406c1 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -17,6 +17,11 @@ config GENERIC_IRQ_SHOW
config GENERIC_IRQ_SHOW_LEVEL
bool
+# Facility to allocate a hardware interrupt. This is legacy support
+# and should not be used in new code. Use irq domains instead.
+config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
+ bool
+
# Support for delayed migration from interrupt context
config GENERIC_PENDING_IRQ
bool