ACPICA: Headers: Deploy #pragma pack (push) and (pop).

Use push and pop to both guarantee that the correct alignment is used,
and to restore the alignment to whatever it was before the header
was included.

It is reported that the #pragma pack(push/pop) directives are not supported
by the specific GCCs, but this patch still doesn't affect kernel build
as there are already #pragma pack([1]) directives used in the old ACPICA
headers, which means there shouldn't be GCCs that are currently used to
compile the ACPI kernels do not support #pragma pack() directives.

References: https://bugs.acpica.org/show_bug.cgi?id=1058
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index f6f5f8af2112..a4a2cd39aea9 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -49,6 +49,8 @@
 #include <acpi/platform/acenv.h>
 #include <acpi/actypes.h>
 
+#pragma pack(push)              /* Set default struct packing */
+
 /* Types for acpi_os_execute */
 
 typedef enum {
@@ -399,4 +401,6 @@ char *acpi_os_get_next_filename(void *dir_handle);
 void acpi_os_close_directory(void *dir_handle);
 #endif
 
+#pragma pack(pop)               /* Restore original struct packing */
+
 #endif                          /* __ACPIOSXF_H__ */