Catch up with r193750 (OsdSynch.c locking changes):

- Preallocate some memory for ACPI tasks early enough.  We cannot use
malloc(9) any more because spin mutex may be held here.  The reserved
memory can be tuned via debug.acpi.max_tasks tunable or ACPI_MAX_TASKS
in kernel configuration.  The default is 32 tasks.
- Implement a custom taskqueue_fast to wrap the new memory allocation.
This implementation is not the fastest in the world but we are being
conservative here.

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/dev/acpica/acpivar.h b/sys/dev/acpica/acpivar.h
index ce6a242..43f77ab 100644
--- a/sys/dev/acpica/acpivar.h
+++ b/sys/dev/acpica/acpivar.h
@@ -457,6 +457,11 @@ ACPI_HANDLE	acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj);
  */
 #define	ACPI_DEV_BASE_ORDER	10
 
+/* Default maximum number of tasks to enqueue. */
+#ifndef ACPI_MAX_TASKS
+#define	ACPI_MAX_TASKS		32
+#endif
+
 /* Default number of task queue threads to start. */
 #ifndef ACPI_MAX_THREADS
 #define ACPI_MAX_THREADS	3