linux-kernel - Re: [PATCH] soc: kunpeng_hccs: fix some sparse warnings about incorrect type

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Date:   Thu, 17 Aug 2023 13:54:04 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Huisong Li" <lihuisong@...wei.com>, xuwei5@...ilicon.com,
        "Arnd Bergmann" <arnd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, soc@...nel.org,
        linux-arm-kernel@...ts.infradead.org, liuyonglong@...wei.com
Subject: Re: [PATCH] soc: kunpeng_hccs: fix some sparse warnings about incorrect type

On Thu, Aug 17, 2023, at 03:37, lihuisong (C) wrote:
> 在 2023/8/16 21:17, Arnd Bergmann 写道:
>> On Tue, Aug 15, 2023, at 14:52, Huisong Li wrote:
>>> @@ -199,8 +200,8 @@ static int hccs_pcc_cmd_send(struct hccs_dev *hdev, u8 cmd,
>>>   			     struct hccs_desc *desc)
>>>   {
>>>   	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
>>> -	struct acpi_pcct_shared_memory *comm_base = cl_info->pcc_comm_addr;
>>> -	void *comm_space = (void *)(comm_base + 1);
>>> +	void __iomem *comm_space = (u8 *)cl_info->pcc_comm_addr +
>>> +					sizeof(struct acpi_pcct_shared_memory);
>>>   	struct hccs_fw_inner_head *fw_inner_head;
>>>   	struct acpi_pcct_shared_memory tmp = {0};
>>>   	u16 comm_space_size;
>> The cast still looks wrong, while both comm_space and ->pcc_comm_addr
>> are __iomem pointers, casting to a non-__iomem u8 pointer should
>> still produce that warning. I'd suggest casting to (u8 __iomem *)
>> or (void __iomem *), I assume you still need a cast here to get
>> the correct address.
> Thanks Arnd.
>
> You are right. So I modify it by dropping (u8 *) here in patch v2.
> Please take a look at this again.

Right, if pcc_comm_addr is already a u8 __iomem* or void*, that
works, I though the cast was needed since it points to a larger
object, which would throw off the calculation.

> If it is ok for you, can you apply this patch to soc/soc.git?

Yes, of course.

       Arnd