ACPICA: Delete recursive feature of ACPI Global Lock

Completed a new design and implementation for
the ACPI Global Lock support. On the OS side, the global
lock is now treated as a standard AML mutex. Previously,
multiple OS threads could acquire the global lock
simultaneously, but this could cause the BIOS to be starved
by the lock in cases such as the Embedded Controller driver,
where there is a tight coupling between the OS and the BIOS.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/include/acpi/acglobal.h b/include/acpi/acglobal.h
index 06972e6637de..bf4318447f1a 100644
--- a/include/acpi/acglobal.h
+++ b/include/acpi/acglobal.h
@@ -197,6 +197,7 @@ ACPI_EXTERN struct acpi_mutex_info acpi_gbl_mutex_info[ACPI_NUM_MUTEX];
 /*
  * Global lock semaphore works in conjunction with the actual HW global lock
  */
+ACPI_EXTERN acpi_mutex acpi_gbl_global_lock_mutex;
 ACPI_EXTERN acpi_semaphore acpi_gbl_global_lock_semaphore;
 
 /*
@@ -240,7 +241,6 @@ ACPI_EXTERN struct acpi_walk_state *acpi_gbl_breakpoint_walk;
 
 /* Misc */
 
-ACPI_EXTERN u32 acpi_gbl_global_lock_thread_count;
 ACPI_EXTERN u32 acpi_gbl_original_mode;
 ACPI_EXTERN u32 acpi_gbl_rsdp_original_location;
 ACPI_EXTERN u32 acpi_gbl_ns_lookup_count;