x86/acpi: address violations of MISRA Rule 20.7

MISRA C Rule 20.7 states: "Expressions resulting from the expansion
of macro parameters shall be enclosed in parentheses". Therefore, some
macro definitions should gain additional parentheses to ensure that all
current and future users will be safe with respect to expansions that
can possibly alter the semantics of the passed-in macro parameter.

No functional change.

Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
index c6fa810a6b1307145895846757dcf9212be50153..610937f42e959ecf2b31881de1ccc947530be065 100644 (file)
--- a/xen/arch/x86/acpi/power.c
+++ b/xen/arch/x86/acpi/power.c
@@ -422,12 +422,12 @@ static void tboot_sleep(u8 sleep_state)
 {
     uint32_t shutdown_type;
 
-#define TB_COPY_GAS(tbg, g)             \
-    tbg.space_id = g.space_id;          \
-    tbg.bit_width = g.bit_width;        \
-    tbg.bit_offset = g.bit_offset;      \
-    tbg.access_width = g.access_width;  \
-    tbg.address = g.address;
+#define TB_COPY_GAS(tbg, g)                 \
+    (tbg).space_id = (g).space_id;          \
+    (tbg).bit_width = (g).bit_width;        \
+    (tbg).bit_offset = (g).bit_offset;      \
+    (tbg).access_width = (g).access_width;  \
+    (tbg).address = (g).address;
 
     /* sizes are not same (due to packing) so copy each one */
     TB_COPY_GAS(g_tboot_shared->acpi_sinfo.pm1a_cnt_blk,