This seems "32" and "31" is obfuscating, It might be better to add a comment, which explain it. Signed-off-by: Kai Ye <yekai13@xxxxxxxxxx> --- 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
