linux-kernel - [PATCH 6/7] mm/zswap: cleanup zswap

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Message-Id: <20231206-zswap-lock-optimize-v1-6-e25b059f9c3a@bytedance.com>
Date:   Wed, 06 Dec 2023 09:46:29 +0000
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     Vitaly Wool <vitaly.wool@...sulko.com>,
        Nhat Pham <nphamcs@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yosry Ahmed <yosryahmed@...gle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH 6/7] mm/zswap: cleanup zswap_load()

After the common decompress part goes to __zswap_load(), we can cleanup
the zswap_load() a little.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 mm/zswap.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 667b66a3911b..50405811cd7b 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -1752,7 +1752,6 @@ bool zswap_load(struct folio *folio)
 	struct zswap_tree *tree = swap_zswap_tree(swp);
 	struct zswap_entry *entry;
 	u8 *dst;
-	bool ret;
 
 	VM_WARN_ON_ONCE(!folio_test_locked(folio));
 
@@ -1769,19 +1768,16 @@ bool zswap_load(struct folio *folio)
 		dst = kmap_local_page(page);
 		zswap_fill_page(dst, entry->value);
 		kunmap_local(dst);
-		ret = true;
-		goto stats;
+	} else {
+		__zswap_load(entry, page);
 	}
 
-	__zswap_load(entry, page);
-	ret = true;
-stats:
 	count_vm_event(ZSWPIN);
 	if (entry->objcg)
 		count_objcg_event(entry->objcg, ZSWPIN);
 
 	spin_lock(&tree->lock);
-	if (ret && zswap_exclusive_loads_enabled) {
+	if (zswap_exclusive_loads_enabled) {
 		zswap_invalidate_entry(tree, entry);
 		folio_mark_dirty(folio);
 	} else if (entry->length) {
@@ -1791,7 +1787,7 @@ bool zswap_load(struct folio *folio)
 	zswap_entry_put(tree, entry);
 	spin_unlock(&tree->lock);
 
-	return ret;
+	return true;
 }
 
 void zswap_invalidate(int type, pgoff_t offset)

-- 
b4 0.10.1