[PATCH 3/5] lockdep: Apply bit_spin_lock lockdep to zram

[Byungchul Park]

In order to use lockdep-enabled bit_spin_lock, we have to call
bit_spin_init() when a instance including the bit used as lock
creates, and bit_spin_free() when the instance including the bit
destroys.

The zram is one of bit_spin_lock users. And this patch adds
bit_spin_init() and bit_spin_free() properly to apply the lock
correctness validator to bit_spin_lock the rzam is using.

Signed-off-by: Byungchul Park <byungchul.p...@lge.com>
---
 drivers/block/zram/zram_drv.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 370c2f7..2bc3bde 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -495,6 +495,11 @@ static void zram_meta_free(struct zram_meta *meta, u64 
disksize)
        }
 
        zs_destroy_pool(meta->mem_pool);
+
+       for (index = 0; index < num_pages; index++) {
+               bit_spin_free(ZRAM_ACCESS, &meta->table[index].value);
+       }
+
        vfree(meta->table);
        kfree(meta);
 }
@@ -503,6 +508,7 @@ static struct zram_meta *zram_meta_alloc(char *pool_name, 
u64 disksize)
 {
        size_t num_pages;
        struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL);
+       int index;
 
        if (!meta)
                return NULL;
@@ -520,6 +526,10 @@ static struct zram_meta *zram_meta_alloc(char *pool_name, 
u64 disksize)
                goto out_error;
        }
 
+       for (index = 0; index < num_pages; index++) {
+               bit_spin_init(ZRAM_ACCESS, &meta->table[index].value);
+       }
+
        return meta;
 
 out_error:
-- 
1.9.1