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 524288 to 0

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Message-ID: <202012112151.6XlgQJKM-lkp@intel.com>
Date:   Fri, 11 Dec 2020 21:20:55 +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 524288 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:   33dc9614dc208291d0c4bcdeb5d30d481dcd2c4c
commit: 7b285f41f7376dc37e7fad1e803995fd39f42848 media: ipu3-cio2: Introduce CIO2_LOP_ENTRIES constant
date:   3 months ago
config: powerpc-randconfig-r023-20201211 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5ff35356f1af2bb92785b38c657463924d9ec386)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-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=powerpc 

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 524288 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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