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

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Message-Id: <74f99c2f-fd9d-4cb9-a541-b699b79b928c@app.fastmail.com>
Date:   Wed, 16 Aug 2023 15:17:00 +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 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.

      Arnd