Le 02/12/2021 à 07:12, Juergen Gross a écrit :
On 01.12.21 22:10, Christophe JAILLET wrote:
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.
Use 'bitmap_copy()' to avoid an explicit 'memcpy()'
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
drivers/block/xen-blkfront.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 700c765a759a..fe4d69cf9469 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -442,16 +442,14 @@ static int xlbd_reserve_minors(unsigned int
minor, unsigned int nr)
if (end > nr_minors) {
unsigned long *bitmap, *old;
- bitmap = kcalloc(BITS_TO_LONGS(end), sizeof(*bitmap),
- GFP_KERNEL);
+ bitmap = bitmap_zalloc(end, GFP_KERNEL);
if (bitmap == NULL)
return -ENOMEM;
spin_lock(&minor_lock);
if (end > nr_minors) {
old = minors;
- memcpy(bitmap, minors,
- BITS_TO_LONGS(nr_minors) * sizeof(*bitmap));
+ bitmap_copy(bitmap, minors, nr_minors);
minors = bitmap;
nr_minors = BITS_TO_LONGS(end) * BITS_PER_LONG;
} else
Shouldn't you use bitmap_free(old) some lines down?
Obvious.
I'll send a V2, Thx for the review.
CJ
@@ -2610,7 +2608,7 @@ static void __exit xlblk_exit(void)
xenbus_unregister_driver(&blkfront_driver);
unregister_blkdev(XENVBD_MAJOR, DEV_NAME);
- kfree(minors);
+ bitmap_free(minors);
}
module_exit(xlblk_exit);
Juergen
