linux-kernel - drivers/media/pci/intel/ipu3/ipu3-cio2.c:163:56: warning: implicit conversion from 'unsigned long' to 'u16' (aka 'unsigned short') changes value from 131072 to 0

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Message-ID: <202101050732.JTRq3iK6-lkp@intel.com>
Date:   Tue, 5 Jan 2021 07:16:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: drivers/media/pci/intel/ipu3/ipu3-cio2.c:163:56: warning: implicit
 conversion from 'unsigned long' to 'u16' (aka 'unsigned short') changes
 value from 131072 to 0

Hi Andy,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e71ba9452f0b5b2e8dc8aa5445198cd9214a6a62
commit: 7b285f41f7376dc37e7fad1e803995fd39f42848 media: ipu3-cio2: Introduce CIO2_LOP_ENTRIES constant
date:   4 months ago
config: arm64-randconfig-r005-20210105 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 98cd1c33e3c2c3cfee36fb0fea3285fda06224d3)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7b285f41f7376dc37e7fad1e803995fd39f42848
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7b285f41f7376dc37e7fad1e803995fd39f42848
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/media/pci/intel/ipu3/ipu3-cio2.c:163:56: warning: implicit conversion from 'unsigned long' to 'u16' (aka 'unsigned short') changes value from 131072 to 0 [-Wconstant-conversion]
           entry[1].second_entry.num_of_pages = CIO2_LOP_ENTRIES * CIO2_MAX_LOPS;
                                              ~ ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
   1 warning generated.


vim +163 drivers/media/pci/intel/ipu3/ipu3-cio2.c

   154	
   155	/* Initialize fpbt entries to point to dummy frame */
   156	static void cio2_fbpt_entry_init_dummy(struct cio2_device *cio2,
   157					       struct cio2_fbpt_entry
   158					       entry[CIO2_MAX_LOPS])
   159	{
   160		unsigned int i;
   161	
   162		entry[0].first_entry.first_page_offset = 0;
 > 163		entry[1].second_entry.num_of_pages = CIO2_LOP_ENTRIES * CIO2_MAX_LOPS;
   164		entry[1].second_entry.last_page_available_bytes = CIO2_PAGE_SIZE - 1;
   165	
   166		for (i = 0; i < CIO2_MAX_LOPS; i++)
   167			entry[i].lop_page_addr = cio2->dummy_lop_bus_addr >> PAGE_SHIFT;
   168	
   169		cio2_fbpt_entry_enable(cio2, entry);
   170	}
   171	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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