genirq: Protect tglx from tripping over his own feet

The irq_desc.status field will either go away or renamed to
settings. Anyway we need to maintain compatibility to avoid breaking
the world and some more. While moving bits into the core, I need to
avoid that I use any of the still existing IRQ_ bits in the core code
by typos. So that file will hold the inline wrappers and some nasty
CPP tricks to break the build when typoed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 11 insertions, 2 deletions

diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index ae96e688f4e1..8f200310a952 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -13,6 +13,8 @@
 # define IRQ_BITMAP_BITS        NR_IRQS
 #endif
 
+#include "settings.h"
+
 #define istate core_internal_state__do_not_mess_with_it
 
 extern int noirqdebug;
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 6f6644f819dd..8b87f2ce0203 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -79,7 +79,7 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
         desc->irq_data.chip_data = NULL;
         desc->irq_data.handler_data = NULL;
         desc->irq_data.msi_desc = NULL;
-        desc->status = IRQ_DEFAULT_INIT_FLAGS;
+        desc->status = _IRQ_DEFAULT_INIT_FLAGS;
         desc->handle_irq = handle_bad_irq;
         desc->depth = 1;
         desc->irq_count = 0;
@@ -246,7 +246,7 @@ int __init early_irq_init(void)
 
 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
         [0 ... NR_IRQS-1] = {
-                .status         = IRQ_DEFAULT_INIT_FLAGS,
+                .status         = _IRQ_DEFAULT_INIT_FLAGS,
                 .handle_irq     = handle_bad_irq,
                 .depth          = 1,
                 .lock           = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
diff --git a/kernel/irq/settings.h b/kernel/irq/settings.h
new file mode 100644
index 000000000000..610f55597ce7
--- /dev/null
+++ b/kernel/irq/settings.h
@@ -0,0 +1,7 @@
+/*
+ * Internal header to deal with irq_desc->status which will be renamed
+ * to irq_desc->settings.
+ */
+enum {
+        _IRQ_DEFAULT_INIT_FLAGS = IRQ_DEFAULT_INIT_FLAGS,
+};