linux-kernel - drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_vpu.c:38:32: warning: cast from 'mtk_vcodec_ipi_handler' (aka 'void (*)(void *, unsigned int, void *)') to 'ipi_handler_t' (aka 'void (*)(const void *, unsigned int, void *)') converts to incompatible f...

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Message-ID: <202302241258.Q3rgDf4M-lkp@intel.com>
Date:   Fri, 24 Feb 2023 13:00:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_vpu.c:38:32:
 warning: cast from 'mtk_vcodec_ipi_handler' (aka 'void (*)(void *, unsigned
 int, void *)') to 'ipi_handler_t' (aka 'void (*)(const void *, unsigned int,
 void *)') converts to incompatible f...

Hi Mauro,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d2980d8d826554fa6981d621e569a453787472f8
commit: 2023a99811110aebba9eee4aa09ef7bd21a8a249 media: platform: rename mediatek/mtk-jpeg/ to mediatek/jpeg/
date:   11 months ago
config: hexagon-randconfig-r041-20230224 (https://download.01.org/0day-ci/archive/20230224/202302241258.Q3rgDf4M-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2023a99811110aebba9eee4aa09ef7bd21a8a249
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 2023a99811110aebba9eee4aa09ef7bd21a8a249
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/media/platform/mediatek/vcodec/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302241258.Q3rgDf4M-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_vpu.c:38:32: warning: cast from 'mtk_vcodec_ipi_handler' (aka 'void (*)(void *, unsigned int, void *)') to 'ipi_handler_t' (aka 'void (*)(const void *, unsigned int, void *)') converts to incompatible function type [-Wcast-function-type-strict]
           ipi_handler_t handler_const = (ipi_handler_t)handler;
                                         ^~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +38 drivers/media/platform/mediatek/vcodec/mtk_vcodec_fw_vpu.c

46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  27  
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  28  static int mtk_vcodec_vpu_set_ipi_register(struct mtk_vcodec_fw *fw, int id,
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  29  					   mtk_vcodec_ipi_handler handler,
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  30  					   const char *name, void *priv)
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  31  {
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  32  	/*
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  33  	 * The handler we receive takes a void * as its first argument. We
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  34  	 * cannot change this because it needs to be passed down to the rproc
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  35  	 * subsystem when SCP is used. VPU takes a const argument, which is
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  36  	 * more constrained, so the conversion below is safe.
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  37  	 */
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13 @38  	ipi_handler_t handler_const = (ipi_handler_t)handler;
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  39  
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  40  	return vpu_ipi_register(fw->pdev, id, handler_const, name, priv);
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  41  }
46233e91fa24a9 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c Alexandre Courbot 2020-10-13  42  

:::::: The code at line 38 was first introduced by commit
:::::: 46233e91fa24a91bffca0680b1c55282ba601918 media: mtk-vcodec: move firmware implementations into their own files

:::::: TO: Alexandre Courbot <acourbot@...omium.org>
:::::: CC: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests