2.6.27+ portability changes

- Added SPL_AC_3ARGS_ON_EACH_CPU configure check to determine
  if the older 4 argument version of on_each_cpu() should be
  used or the new 3 argument version.  The retry argument was
  dropped in the new API which was never used anyway.
- Updated work queue compatibility wrappers.  The old way this
  worked was to pass a data point when initialized the workqueue.
  The new API assumed the work item is embedding in a structure
  and we us container_of() to find that data pointer.
- Updated skc->skc_flags to be an unsigned long which is now
  type checked in the bit operations.  This silences the warnings.
- Updated autogen products and splat tests accordingly

include/linux/smp_compat.h

@@ -0,0 +1,16 @@
+#ifndef _SPL_SMP_COMPAT_H
+#define _SPL_SMP_COMPAT_H
+
+#include <linux/smp.h>
+
+#ifdef HAVE_3ARGS_ON_EACH_CPU
+
+#define spl_on_each_cpu(func,info,wait)	on_each_cpu(func,info,wait)
+
+#else
+
+#define spl_on_each_cpu(func,info,wait)	on_each_cpu(func,info,0,wait)
+
+#endif /* HAVE_3ARGS_ON_EACH_CPU */
+
+#endif /* _SPL_SMP_COMPAT_H */

include/linux/workqueue_compat.h

@@ -0,0 +1,25 @@
+#ifndef _SPL_WORKQUEUE_COMPAT_H
+#define _SPL_WORKQUEUE_COMPAT_H
+
+#include <linux/workqueue.h>
+#include <sys/types.h>
+
+#ifdef HAVE_3ARGS_INIT_WORK
+
+#define delayed_work			work_struct
+
+#define spl_init_work(wq, cb, d)	INIT_WORK((wq), (void *)(cb), \
+						  (void *)(d))
+#define spl_init_delayed_work(wq,cb,d)	INIT_WORK((wq), (void *)(cb), \
+						  (void *)(d))
+#define spl_get_work_data(d, t, f)	(t *)(d)
+
+#else
+
+#define spl_init_work(wq, cb, d)	INIT_WORK((wq), (void *)(cb));
+#define spl_init_delayed_work(wq,cb,d)	INIT_DELAYED_WORK((wq), (void *)(cb));
+#define spl_get_work_data(d, t, f)	(t *)container_of(d, t, f)
+
+#endif /* HAVE_3ARGS_INIT_WORK */
+
+#endif  /* _SPL_WORKQUEUE_COMPAT_H */