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crypto: hisilicon/sgl - add a comment for block size initialization

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This seems "32" and "31" is obfuscating, It might be better to add a comment,
which explain it.

Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Kai Ye 2021-04-09 17:04:00 +08:00 committed by Herbert Xu
parent 07a4356baf
commit 51028c6efa
1 changed files with 5 additions and 0 deletions
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5
drivers/crypto/hisilicon/sgl.c
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@ -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;