get_mm_hiwater_xxx: trivial, s/define/inline/

Andrew pointed out get_mm_hiwater_xxx() evaluate "mm" argument thrice/twice,
make them inline.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Hugh Dickins <hugh@veritas.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/sched.h

@@ -391,8 +391,15 @@ extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
 		(mm)->hiwater_vm = (mm)->total_vm;	\
 } while (0)
 
-#define get_mm_hiwater_rss(mm)	max((mm)->hiwater_rss, get_mm_rss(mm))
-#define get_mm_hiwater_vm(mm)	max((mm)->hiwater_vm, (mm)->total_vm)
+static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
+{
+	return max(mm->hiwater_rss, get_mm_rss(mm));
+}
+
+static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
+{
+	return max(mm->hiwater_vm, mm->total_vm);
+}
 
 extern void set_dumpable(struct mm_struct *mm, int value);
 extern int get_dumpable(struct mm_struct *mm);