ACPICA: Re-implement interpreters' "serialized mode"

Enhanced the implementation of the interpreters'
serialized mode (boot with "acpi_serialize" to set
acpi_glb_all_methods_serialized flag.)
When this mode is specified, instead of creating a serialization
semaphore per control method, the interpreter lock is
simply no longer released before a blocking operation
during control method execution. This effectively makes
the AML Interpreter single-threaded. The overhead of a
semaphore per-method is eliminated.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/acpi/executer/excreate.c b/drivers/acpi/executer/excreate.c
index a4d29b2d086f..c665aa776f83 100644
--- a/drivers/acpi/executer/excreate.c
+++ b/drivers/acpi/executer/excreate.c
@@ -583,10 +583,7 @@ acpi_ex_create_method(u8 * aml_start,
          * Get the sync_level. If method is serialized, a mutex will be
          * created for this method when it is parsed.
          */
-        if (acpi_gbl_all_methods_serialized) {
-                obj_desc->method.sync_level = 0;
-                obj_desc->method.method_flags |= AML_METHOD_SERIALIZED;
-        } else if (method_flags & AML_METHOD_SERIALIZED) {
+        if (method_flags & AML_METHOD_SERIALIZED) {
                 /*
                  * ACPI 1.0: sync_level = 0
                  * ACPI 2.0: sync_level = sync_level in method declaration