# \[PATCH\] dmaengine: sh: Use bitmap\_zalloc() when applicable

- From: Christophe JAILLET \<hidden\>
- Date: 2021-11-23 21:26:26 
- List: dmaengine
- Page: https://ratatoskr.run/dmaengine/2021/11/1583294
- Thread: https://ratatoskr.run/dmaengine/2021/11/1583294/t.md

```text
'shdma_slave_used' is a bitmap. So use 'bitmap_zalloc()' to simplify code,
improve the semantic and avoid some open-coded arithmetic in allocator
arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.

Signed-off-by: Christophe JAILLET <redacted>
---
 drivers/dma/sh/shdma-base.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
index 7f72b3f4cd1a..0a2eb5f5a6e8 100644
--- a/drivers/dma/sh/shdma-base.c
+++ b/drivers/dma/sh/shdma-base.c
@@ -1042,9 +1042,7 @@ EXPORT_SYMBOL(shdma_cleanup);
 
 static int __init shdma_enter(void)
 {
-	shdma_slave_used = kcalloc(DIV_ROUND_UP(slave_num, BITS_PER_LONG),
-				   sizeof(long),
-				   GFP_KERNEL);
+	shdma_slave_used = bitmap_zalloc(slave_num, GFP_KERNEL);
 	if (!shdma_slave_used)
 		return -ENOMEM;
 	return 0;
@@ -1053,7 +1051,7 @@ module_init(shdma_enter);
 
 static void __exit shdma_exit(void)
 {
-	kfree(shdma_slave_used);
+	bitmap_free(shdma_slave_used);
 }
 module_exit(shdma_exit);
 
-- 
2.30.2

```