Merge commit 'v2.6.28-rc2' into core/locking

Conflicts:
	arch/um/include/asm/system.h

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/parisc/include/asm/hardirq.h b/arch/parisc/include/asm/hardirq.h
new file mode 100644
index 000000000000..ce93133d5112
--- /dev/null
+++ b/arch/parisc/include/asm/hardirq.h
@@ -0,0 +1,29 @@
+/* hardirq.h: PA-RISC hard IRQ support.
+ *
+ * Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
+ *
+ * The locking is really quite interesting.  There's a cpu-local
+ * count of how many interrupts are being handled, and a global
+ * lock.  An interrupt can only be serviced if the global lock
+ * is free.  You can't be sure no more interrupts are being
+ * serviced until you've acquired the lock and then checked
+ * all the per-cpu interrupt counts are all zero.  It's a specialised
+ * br_lock, and that's exactly how Sparc does it.  We don't because
+ * it's more locking for us.  This way is lock-free in the interrupt path.
+ */
+
+#ifndef _PARISC_HARDIRQ_H
+#define _PARISC_HARDIRQ_H
+
+#include <linux/threads.h>
+#include <linux/irq.h>
+
+typedef struct {
+	unsigned long __softirq_pending; /* set_bit is used on this */
+} ____cacheline_aligned irq_cpustat_t;
+
+#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
+
+void ack_bad_irq(unsigned int irq);
+
+#endif /* _PARISC_HARDIRQ_H */