ACPICA: Remove unused ACPI_FREE_BUFFER macro. No functional change.

This macro is no longer used by ACPICA and it is not public.
Also update comments related to the use of ACPI_ALLOCATE_BUFFER and
the use of acpi_os_free (kfree is equivalent and prefered in the
kernel) to free the buffer.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/acpi/acpica/utalloc.c b/drivers/acpi/acpica/utalloc.c
index 814267f52715..1851762fc5b5 100644
--- a/drivers/acpi/acpica/utalloc.c
+++ b/drivers/acpi/acpica/utalloc.c
@@ -302,9 +302,13 @@ acpi_ut_initialize_buffer(struct acpi_buffer * buffer,
                 return (AE_BUFFER_OVERFLOW);
 
         case ACPI_ALLOCATE_BUFFER:
-
-                /* Allocate a new buffer */
-
+                /*
+                 * Allocate a new buffer. We directectly call acpi_os_allocate here to
+                 * purposefully bypass the (optionally enabled) internal allocation
+                 * tracking mechanism since we only want to track internal
+                 * allocations. Note: The caller should use acpi_os_free to free this
+                 * buffer created via ACPI_ALLOCATE_BUFFER.
+                 */
                 buffer->pointer = acpi_os_allocate(required_length);
                 break;