[PATCH] Add SA_PERCPU_IRQ flag support

Add support for SA_PERCPU_IRQ (only mmtimer.c uses this at this stage).

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 18 insertions, 5 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 97d5559997d2..6edfcef291e8 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -204,10 +204,14 @@ int setup_irq(unsigned int irq, struct irqaction * new)
         p = &desc->action;
         if ((old = *p) != NULL) {
                 /* Can't share interrupts unless both agree to */
-                if (!(old->flags & new->flags & SA_SHIRQ)) {
-                        spin_unlock_irqrestore(&desc->lock,flags);
-                        return -EBUSY;
-                }
+                if (!(old->flags & new->flags & SA_SHIRQ))
+                        goto mismatch;
+
+#if defined(ARCH_HAS_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
+                /* All handlers must agree on per-cpuness */
+                if ((old->flags & IRQ_PER_CPU) != (new->flags & IRQ_PER_CPU))
+                        goto mismatch;
+#endif
 
                 /* add new interrupt at end of irq queue */
                 do {
@@ -218,7 +222,10 @@ int setup_irq(unsigned int irq, struct irqaction * new)
         }
 
         *p = new;
-
+#if defined(ARCH_HAS_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
+        if (new->flags & SA_PERCPU_IRQ)
+                desc->status |= IRQ_PER_CPU;
+#endif
         if (!shared) {
                 desc->depth = 0;
                 desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT |
@@ -236,6 +243,12 @@ int setup_irq(unsigned int irq, struct irqaction * new)
         register_handler_proc(irq, new);
 
         return 0;
+
+mismatch:
+        spin_unlock_irqrestore(&desc->lock, flags);
+        printk(KERN_ERR "%s: irq handler mismatch\n", __FUNCTION__);
+        dump_stack();
+        return -EBUSY;
 }
 
 /**