[PATCH 06/13] mm: don't pass enum lru_list to trace_mm_lru_insertion()

[Yu Zhao]

The parameter is redundant in the sense that it can be extracted
from the struct page parameter by page_lru() correctly.

This change should have no side effects.

Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
---
 include/trace/events/pagemap.h | 11 ++++-------
 mm/swap.c                      |  5 +----
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/include/trace/events/pagemap.h b/include/trace/events/pagemap.h
index 8fd1babae761..e1735fe7c76a 100644
--- a/include/trace/events/pagemap.h
+++ b/include/trace/events/pagemap.h
@@ -27,24 +27,21 @@
 
 TRACE_EVENT(mm_lru_insertion,
 
-	TP_PROTO(
-		struct page *page,
-		int lru
-	),
+	TP_PROTO(struct page *page),
 
-	TP_ARGS(page, lru),
+	TP_ARGS(page),
 
 	TP_STRUCT__entry(
 		__field(struct page *,	page	)
 		__field(unsigned long,	pfn	)
-		__field(int,		lru	)
+		__field(enum lru_list,	lru	)
 		__field(unsigned long,	flags	)
 	),
 
 	TP_fast_assign(
 		__entry->page	= page;
 		__entry->pfn	= page_to_pfn(page);
-		__entry->lru	= lru;
+		__entry->lru	= page_lru(page);
 		__entry->flags	= trace_pagemap_flags(page);
 	),
 
diff --git a/mm/swap.c b/mm/swap.c
index 8d0e31d43852..3c89a7276359 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -962,7 +962,6 @@ void lru_add_page_tail(struct page *page, struct page *page_tail,
 static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
 				 void *arg)
 {
-	enum lru_list lru;
 	int was_unevictable = TestClearPageUnevictable(page);
 	int nr_pages = thp_nr_pages(page);
 
@@ -998,11 +997,9 @@ static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
 	smp_mb__after_atomic();
 
 	if (page_evictable(page)) {
-		lru = page_lru(page);
 		if (was_unevictable)
 			__count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
 	} else {
-		lru = LRU_UNEVICTABLE;
 		ClearPageActive(page);
 		SetPageUnevictable(page);
 		if (!was_unevictable)
@@ -1010,7 +1007,7 @@ static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
 	}
 
 	add_page_to_lru_list(page, lruvec);
-	trace_mm_lru_insertion(page, lru);
+	trace_mm_lru_insertion(page);
 }
 
 /*
-- 
2.28.0.681.g6f77f65b4e-goog