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Message-Id: <1466398515-1005-4-git-send-email-byungchul.park@lge.com>
Date: Mon, 20 Jun 2016 13:55:13 +0900
From: Byungchul Park <byungchul.park@....com>
To: peterz@...radead.org, mingo@...nel.org
Cc: linux-kernel@...r.kernel.org, npiggin@...e.de,
sergey.senozhatsky@...il.com, gregkh@...uxfoundation.org,
minchan@...nel.org
Subject: [PATCH 3/5] lockdep: Apply bit_spin_lock lockdep to zram
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.park@....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
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