linux-kernel - [PATCH 12/17] zram: Add zram_table

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Date:   Fri,  9 Apr 2021 03:51:26 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     neilb@...e.de, peterz@...radead.org, mingo@...hat.com,
        will@...nel.org, longman@...hat.com, boqun.feng@...il.com,
        tglx@...utronix.de, bigeasy@...utronix.de
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 12/17] zram: Add zram_table_lock

Allow lockdep to track the zram bit spin locks.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 drivers/block/zram/zram_drv.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index cf8deecc39ef..8b678cc6ed21 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -59,20 +59,22 @@ static void zram_free_page(struct zram *zram, size_t index);
 static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
 				u32 index, int offset, struct bio *bio);
 
+static DEFINE_SPLIT_LOCK(zram_table_lock);
 
 static int zram_slot_trylock(struct zram *zram, u32 index)
 {
-	return bit_spin_trylock(ZRAM_LOCK, &zram->table[index].flags);
+	return bit_spin_trylock(ZRAM_LOCK, &zram->table[index].flags,
+			&zram_table_lock);
 }
 
 static void zram_slot_lock(struct zram *zram, u32 index)
 {
-	bit_spin_lock(ZRAM_LOCK, &zram->table[index].flags);
+	bit_spin_lock(ZRAM_LOCK, &zram->table[index].flags, &zram_table_lock);
 }
 
 static void zram_slot_unlock(struct zram *zram, u32 index)
 {
-	bit_spin_unlock(ZRAM_LOCK, &zram->table[index].flags);
+	bit_spin_unlock(ZRAM_LOCK, &zram->table[index].flags, &zram_table_lock);
 }
 
 static inline bool init_done(struct zram *zram)
-- 
2.30.2