ACPICA: Dispatcher: Introduce timeout mechanism for infinite loop detection

ACPICA commit 9605023e7e6d1f05581502766c8cf2905bcc03d9

This patch implements a new infinite loop detection mechanism to replace
the old one, it uses acpi_os_get_timer() to limit loop execution into a
determined time slice.
This is useful in case some hardware/firmware operations really require the
AML interpreter to wait while the old mechanism could expire too fast on
recent machines.

The new mechanism converts old acpi_gbl_max_loop_iterations to store the user
configurable value for the new mechanism in order to allow users to be
still able to configure this value for acpiexec via command line. This
patch also removes wrong initilization code of acpi_gbl_max_loop_iterations
accordingly (it should have been initialized by ACPI_INIT_GLOBAL, and the
default value is also properly tuned for acpiexec). Reported by M. Foronda,
fixed by Lv Zheng.

Link: https://github.com/acpica/acpica/commit/9605023e
Link: https://bugzilla.kernel.org/show_bug.cgi?id=156501
Reported-by: M. Foronda <josemauricioforonda@gmail.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 4f077edb9b81..ddde2790a54a 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -468,6 +468,8 @@ typedef void *acpi_handle;	/* Actually a ptr to a NS Node */
 #define ACPI_NSEC_PER_MSEC              1000000L
 #define ACPI_NSEC_PER_SEC               1000000000L
 
+#define ACPI_TIME_AFTER(a, b)           ((s64)((b) - (a)) < 0)
+
 /* Owner IDs are used to track namespace nodes for selective deletion */
 
 typedef u8 acpi_owner_id;