mm/vmscan: simplify trace_reclaim_flags and trace_shrink_flags

trace_reclaim_flags and trace_shrink_flags are almost the same.
We can simplify them to avoid redundant code.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Yafang Shao <[e-mail]>
Reviewed-by: Andrew Morton <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Johannes Weiner <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/trace/events/vmscan.h

···
 		{RECLAIM_WB_ASYNC,	"RECLAIM_WB_ASYNC"}	\
 		) : "RECLAIM_WB_NONE"
 
-#define trace_reclaim_flags(page) ( \
-	(page_is_file_cache(page) ? RECLAIM_WB_FILE : RECLAIM_WB_ANON) | \
+#define trace_reclaim_flags(file) ( \
+	(file ? RECLAIM_WB_FILE : RECLAIM_WB_ANON) | \
 	(RECLAIM_WB_ASYNC) \
-	)
-
-#define trace_shrink_flags(file) \
-	( \
-		(file ? RECLAIM_WB_FILE : RECLAIM_WB_ANON) | \
-		(RECLAIM_WB_ASYNC) \
 	)
 
 TRACE_EVENT(mm_vmscan_kswapd_sleep,
···
 
 	TP_fast_assign(
 		__entry->pfn = page_to_pfn(page);
-		__entry->reclaim_flags = trace_reclaim_flags(page);
+		__entry->reclaim_flags = trace_reclaim_flags(
+						page_is_file_cache(page));
 	),
 
 	TP_printk("page=%p pfn=%lu flags=%s",
···
 		__entry->nr_ref_keep = stat->nr_ref_keep;
 		__entry->nr_unmap_fail = stat->nr_unmap_fail;
 		__entry->priority = priority;
-		__entry->reclaim_flags = trace_shrink_flags(file);
+		__entry->reclaim_flags = trace_reclaim_flags(file);
 	),
 
 	TP_printk("nid=%d nr_scanned=%ld nr_reclaimed=%ld nr_dirty=%ld nr_writeback=%ld nr_congested=%ld nr_immediate=%ld nr_activate_anon=%d nr_activate_file=%d nr_ref_keep=%ld nr_unmap_fail=%ld priority=%d flags=%s",
···
 		__entry->nr_deactivated = nr_deactivated;
 		__entry->nr_referenced = nr_referenced;
 		__entry->priority = priority;
-		__entry->reclaim_flags = trace_shrink_flags(file);
+		__entry->reclaim_flags = trace_reclaim_flags(file);
 	),
 
 	TP_printk("nid=%d nr_taken=%ld nr_active=%ld nr_deactivated=%ld nr_referenced=%ld priority=%d flags=%s",
···
 		__entry->total_active = total_active;
 		__entry->active = active;
 		__entry->ratio = ratio;
-		__entry->reclaim_flags = trace_shrink_flags(file) & RECLAIM_WB_LRU;
+		__entry->reclaim_flags = trace_reclaim_flags(file) &
+					 RECLAIM_WB_LRU;
 	),
 
 	TP_printk("nid=%d reclaim_idx=%d total_inactive=%ld inactive=%ld total_active=%ld active=%ld ratio=%ld flags=%s",