linux-kernel - [PATCH 4/4] mm/compaction: add compact_unlock

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Message-Id: <20230719113001.2023703-5-shikemeng@huaweicloud.com>
Date:   Wed, 19 Jul 2023 19:30:01 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     shikemeng@...weicloud.com
Subject: [PATCH 4/4] mm/compaction: add compact_unlock_irqrestore to remove repeat code

Add compact_unlock_irqrestore to remove repeat code. This also make
compact lock functions sereis complete as we can call
compact_lock_irqsave/compact_unlock_irqrestore in pair.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 mm/compaction.c | 43 ++++++++++++++++---------------------------
 1 file changed, 16 insertions(+), 27 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index c1dc821ac6e1..eb1d3d9a422c 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -541,6 +541,14 @@ static spinlock_t *compact_lock_irqsave(spinlock_t *lock, unsigned long *flags,
 	return lock;
 }
 
+static inline void compact_unlock_irqrestore(spinlock_t **locked, unsigned long flags)
+{
+	if (*locked) {
+		spin_unlock_irqrestore(*locked, flags);
+		*locked = NULL;
+	}
+}
+
 /*
  * Compaction requires the taking of some coarse locks that are potentially
  * very heavily contended. The lock should be periodically unlocked to avoid
@@ -556,10 +564,7 @@ static spinlock_t *compact_lock_irqsave(spinlock_t *lock, unsigned long *flags,
 static bool compact_unlock_should_abort(spinlock_t **locked,
 		unsigned long flags, struct compact_control *cc)
 {
-	if (*locked) {
-		spin_unlock_irqrestore(*locked, flags);
-		*locked = NULL;
-	}
+	compact_unlock_irqrestore(locked, flags);
 
 	if (fatal_signal_pending(current)) {
 		cc->contended = true;
@@ -671,8 +676,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 
 	}
 
-	if (locked)
-		spin_unlock_irqrestore(locked, flags);
+	compact_unlock_irqrestore(&locked, flags);
 
 	/*
 	 * There is a tiny chance that we have read bogus compound_order(),
@@ -935,10 +939,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		}
 
 		if (PageHuge(page) && cc->alloc_contig) {
-			if (locked) {
-				spin_unlock_irqrestore(locked, flags);
-				locked = NULL;
-			}
+			compact_unlock_irqrestore(&locked, flags);
 
 			ret = isolate_or_dissolve_huge_page(page, &cc->migratepages);
 
@@ -1024,10 +1025,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 			 */
 			if (unlikely(__PageMovable(page)) &&
 					!PageIsolated(page)) {
-				if (locked) {
-					spin_unlock_irqrestore(locked, flags);
-					locked = NULL;
-				}
+				compact_unlock_irqrestore(&locked, flags);
 
 				if (isolate_movable_page(page, mode)) {
 					folio = page_folio(page);
@@ -1111,9 +1109,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 		/* If we already hold the lock, we can skip some rechecking */
 		if (&lruvec->lru_lock != locked) {
-			if (locked)
-				spin_unlock_irqrestore(locked, flags);
-
+			compact_unlock_irqrestore(&locked, flags);
 			locked = compact_lock_irqsave(&lruvec->lru_lock, &flags, cc);
 
 			lruvec_memcg_debug(lruvec, folio);
@@ -1176,10 +1172,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 isolate_fail_put:
 		/* Avoid potential deadlock in freeing page under lru_lock */
-		if (locked) {
-			spin_unlock_irqrestore(locked, flags);
-			locked = NULL;
-		}
+		compact_unlock_irqrestore(&locked, flags);
 		folio_put(folio);
 
 isolate_fail:
@@ -1192,10 +1185,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		 * page anyway.
 		 */
 		if (nr_isolated) {
-			if (locked) {
-				spin_unlock_irqrestore(locked, flags);
-				locked = NULL;
-			}
+			compact_unlock_irqrestore(&locked, flags);
 			putback_movable_pages(&cc->migratepages);
 			cc->nr_migratepages = 0;
 			nr_isolated = 0;
@@ -1224,8 +1214,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 	folio = NULL;
 
 isolate_abort:
-	if (locked)
-		spin_unlock_irqrestore(locked, flags);
+	compact_unlock_irqrestore(&locked, flags);
 	if (folio) {
 		folio_set_lru(folio);
 		folio_put(folio);
-- 
2.30.0