This seems "32" and "31" is obfuscating, It might be better to add a comment,
which explain it.
Signed-off-by: Kai Ye <yeka...@huawei.com>
---
drivers/crypto/hisilicon/sgl.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/crypto/hisilicon/sgl.c b/drivers/crypto/hisilicon/sgl.c
index 3bff639..cf1629c 100644
--- a/drivers/crypto/hisilicon/sgl.c
+++ b/drivers/crypto/hisilicon/sgl.c
@@ -66,6 +66,11 @@ struct hisi_acc_sgl_pool *hisi_acc_create_sgl_pool(struct
device *dev,
sgl_size = sizeof(struct acc_hw_sge) * sge_nr +
sizeof(struct hisi_acc_hw_sgl);
+
+ /*
+ * the pool may allocate a block of memory of size PAGE_SIZE *
2^(MAX_ORDER - 1),
+ * block size may exceed 2^31 on ia64, so the max of block size is 2^31
+ */
block_size = 1 << (PAGE_SHIFT + MAX_ORDER <= 32 ?
PAGE_SHIFT + MAX_ORDER - 1 : 31);
sgl_num_per_block = block_size / sgl_size;
--
2.8.1
