xen/mm: address violations of MISRA C 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/include/xen/mm.h b/xen/include/xen/mm.h
index 3e84960a365fa7d077d24dac5d6831682a3047b4..7561297a7553b01a74e5c99ee686010c15d05477 100644 (file)
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -415,15 +415,15 @@ page_list_splice(struct page_list_head *list, struct page_list_head *head)
 }
 
 #define page_list_for_each(pos, head) \
-    for ( pos = (head)->next; pos; pos = page_list_next(pos, head) )
+    for ( (pos) = (head)->next; (pos); (pos) = page_list_next(pos, head) )
 #define page_list_for_each_safe(pos, tmp, head) \
-    for ( pos = (head)->next; \
-          pos ? (tmp = page_list_next(pos, head), 1) : 0; \
-          pos = tmp )
+    for ( (pos) = (head)->next; \
+          (pos) ? ((tmp) = page_list_next(pos, head), 1) : 0; \
+          (pos) = (tmp) )
 #define page_list_for_each_safe_reverse(pos, tmp, head) \
-    for ( pos = (head)->tail; \
-          pos ? (tmp = page_list_prev(pos, head), 1) : 0; \
-          pos = tmp )
+    for ( (pos) = (head)->tail; \
+          (pos) ? ((tmp) = page_list_prev(pos, head), 1) : 0; \
+          (pos) = (tmp) )
 #else
 # define page_list_head                  list_head
 # define PAGE_LIST_HEAD_INIT             LIST_HEAD_INIT