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From:   Kai Ye <yekai13@huawei.com>
To:     <herbert@gondor.apana.org.au>
CC:     <linux-crypto@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <yekai13@huawei.com>
Subject: [PATCH v3 1/5] crypto: hisilicon/sgl - add a comment for block size initialization
Date:   Fri, 9 Apr 2021 17:04:00 +0800
Message-ID: <1617959044-11023-2-git-send-email-yekai13@huawei.com>
In-Reply-To: <1617959044-11023-1-git-send-email-yekai13@huawei.com>
References: <1617959044-11023-1-git-send-email-yekai13@huawei.com>
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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>
---
 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