[PATCH v2] bcache: Use vmalloc_array() to improve code

Remove array_size() calls and replace vmalloc(),
due to vmalloc_array() being optimized better,
using fewer instructions, and handling overflow more concisely.

Signed-off-by: tanze <[email protected]>
---
Hi, Coly Li.

Thank you for your suggestions. 
I have made revisions according to your requirements. 
Do you have any further suggestions?

---
Changes in v2:
- Fix coding style and formatting issues.
---
 drivers/md/bcache/sysfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 826b14cae4e5..1ecd2cb3d302 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -1061,8 +1061,8 @@ SHOW(__bch_cache)
 		uint16_t q[31], *p, *cached;
 		ssize_t ret;
 
-		cached = p = vmalloc(array_size(sizeof(uint16_t),
-						ca->sb.nbuckets));
+		cached = p = vmalloc_array(ca->sb.nbuckets, sizeof(uint16_t));
+
 		if (!p)
 			return -ENOMEM;
 
-- 
2.25.1