linux-kernel - [PATCH v5 3/5] mm/zswap: cleanup zswap

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Message-Id: <20231213-zswap-dstmem-v5-3-9382162bbf05@bytedance.com>
Date: Thu, 28 Dec 2023 09:45:44 +0000
From: Chengming Zhou <zhouchengming@...edance.com>
To: Barry Song <21cnbao@...il.com>, Yosry Ahmed <yosryahmed@...gle.com>, Nhat Pham <nphamcs@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Dan Streetman <ddstreet@...e.org>, Vitaly Wool <vitaly.wool@...sulko.com>,
 Johannes Weiner <hannes@...xchg.org>, Chris Li <chriscli@...gle.com>, Seth Jennings <sjenning@...hat.com>
Cc: Yosry Ahmed <yosryahmed@...gle.com>, Nhat Pham <nphamcs@...il.com>, Chris Li <chrisl@...nel.org>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH v5 3/5] mm/zswap: cleanup zswap_load()

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

Reviewed-by: Yosry Ahmed <yosryahmed@...gle.com>
Acked-by: Chis Li <chrisl@...nel.org> (Google)
Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 mm/zswap.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index b25d7d03851d..618989463535 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -1760,7 +1760,6 @@ bool zswap_load(struct folio *folio)
 	struct zswap_tree *tree = zswap_trees[type];
 	struct zswap_entry *entry;
 	u8 *dst;
-	bool ret;
 
 	VM_WARN_ON_ONCE(!folio_test_locked(folio));
 
@@ -1773,23 +1772,20 @@ bool zswap_load(struct folio *folio)
 	}
 	spin_unlock(&tree->lock);
 
-	if (!entry->length) {
+	if (entry->length)
+		__zswap_load(entry, page);
+	else {
 		dst = kmap_local_page(page);
 		zswap_fill_page(dst, entry->value);
 		kunmap_local(dst);
-		ret = true;
-		goto stats;
 	}
 
-	__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) {
@@ -1799,7 +1795,7 @@ 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