linux-kernel - Re: [hverkuil-media-tree:for-v6.1c 3/3] drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c:905:10: warning: cast to smaller integer type 'enum mdp_comp

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Date:   Fri, 19 Aug 2022 17:32:05 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     kernel test robot <lkp@...el.com>, Moudy Ho <moudy.ho@...iatek.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
        daoyuan huang <daoyuan.huang@...iatek.com>
Subject: Re: [hverkuil-media-tree:for-v6.1c 3/3]
 drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c:905:10: warning: cast to
 smaller integer type 'enum mdp_comp_type' from 'const void *'

Hi Moudy,

On 19/08/2022 04:05, kernel test robot wrote:
> tree:   git://linuxtv.org/hverkuil/media_tree.git for-v6.1c
> head:   b2273b84e1291c52279edf13b08744833c1faaab
> commit: b2273b84e1291c52279edf13b08744833c1faaab [3/3] media: platform: mtk-mdp3: add MediaTek MDP3 driver
> config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20220819/202208190957.uDT8XE6b-lkp@intel.com/config)
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project aed5e3bea138ce581d682158eb61c27b3cfdd6ec)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         git remote add hverkuil-media-tree git://linuxtv.org/hverkuil/media_tree.git
>         git fetch --no-tags hverkuil-media-tree for-v6.1c
>         git checkout b2273b84e1291c52279edf13b08744833c1faaab
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/media/platform/mediatek/mdp3/ drivers/vfio/pci/hisilicon/
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>>> drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c:905:10: warning: cast to smaller integer type 'enum mdp_comp_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
>                    type = (enum mdp_comp_type)of_id->data;
>                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c:964:10: warning: cast to smaller integer type 'enum mdp_comp_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
>                    type = (enum mdp_comp_type)of_id->data;
>                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Can you fix this? I believe you need to do this to fix this:

(enum mdp_comp_type)(uintptr_t)of_id->data

Regards,

	Hans

>    2 warnings generated.
> 
> 
> vim +905 drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c
> 
>    883	
>    884	static int mdp_comp_sub_create(struct mdp_dev *mdp)
>    885	{
>    886		struct device *dev = &mdp->pdev->dev;
>    887		struct device_node *node, *parent;
>    888	
>    889		parent = dev->of_node->parent;
>    890	
>    891		for_each_child_of_node(parent, node) {
>    892			const struct of_device_id *of_id;
>    893			enum mdp_comp_type type;
>    894			int id, alias_id;
>    895			struct mdp_comp *comp;
>    896	
>    897			of_id = of_match_node(mdp_sub_comp_dt_ids, node);
>    898			if (!of_id)
>    899				continue;
>    900			if (!of_device_is_available(node)) {
>    901				dev_dbg(dev, "Skipping disabled sub comp. %pOF\n", node);
>    902				continue;
>    903			}
>    904	
>  > 905			type = (enum mdp_comp_type)of_id->data;
>    906			alias_id = mdp_comp_alias_id[type];
>    907			id = mdp_comp_get_id(type, alias_id);
>    908			if (id < 0) {
>    909				dev_err(dev,
>    910					"Fail to get sub comp. id: type %d alias %d\n",
>    911					type, alias_id);
>    912				return -EINVAL;
>    913			}
>    914			mdp_comp_alias_id[type]++;
>    915	
>    916			comp = mdp_comp_create(mdp, node, id);
>    917			if (IS_ERR(comp))
>    918				return PTR_ERR(comp);
>    919		}
>    920	
>    921		return 0;
>    922	}
>    923	
>