Date:   Wed, 15 Mar 2023 16:36:29 +0800
From:   kernel test robot <lkp@intel.com>
To:     Paul Cercueil <paul@crapouillou.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        Christian =?iso-8859-1?Q?K=F6nig?= <christian.koenig@amd.com>
Cc:     llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
        Paul Cercueil <paul@crapouillou.net>,
        michael.hennerich@analog.com, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        nuno.sa@analog.com, linaro-mm-sig@lists.linaro.org,
        linux-media@vger.kernel.org
Subject: Re: [PATCH 2/2] usb: gadget: functionfs: Add DMABUF import interface
Message-ID: <202303151639.4xUPfzJD-lkp@intel.com>
References: <20230314105257.17345-3-paul@crapouillou.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230314105257.17345-3-paul@crapouillou.net>
Precedence: bulk

Hi Paul,

I love your patch! Perhaps something to improve:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on usb/usb-next usb/usb-linus linus/master v6.3-rc2 next-20230315]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Paul-Cercueil/usb-gadget-Support-already-mapped-DMA-SGs/20230314-185522
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20230314105257.17345-3-paul%40crapouillou.net
patch subject: [PATCH 2/2] usb: gadget: functionfs: Add DMABUF import interface
config: s390-randconfig-r002-20230312 (https://download.01.org/0day-ci/archive/20230315/202303151639.4xUPfzJD-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/4ee364ed5d112c4550344fd037f4e1ef7cc41878
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Paul-Cercueil/usb-gadget-Support-already-mapped-DMA-SGs/20230314-185522
        git checkout 4ee364ed5d112c4550344fd037f4e1ef7cc41878
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/media/platform/mediatek/jpeg/ drivers/usb/gadget/function/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303151639.4xUPfzJD-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/usb/gadget/function/f_fs.c:18:
   In file included from include/linux/dma-buf.h:16:
   In file included from include/linux/iosys-map.h:10:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from drivers/usb/gadget/function/f_fs.c:18:
   In file included from include/linux/dma-buf.h:16:
   In file included from include/linux/iosys-map.h:10:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from drivers/usb/gadget/function/f_fs.c:18:
   In file included from include/linux/dma-buf.h:16:
   In file included from include/linux/iosys-map.h:10:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
>> drivers/usb/gadget/function/f_fs.c:1401:5: warning: no previous prototype for function 'ffs_dma_resv_lock' [-Wmissing-prototypes]
   int ffs_dma_resv_lock(struct dma_buf *dmabuf, bool nonblock)
       ^
   drivers/usb/gadget/function/f_fs.c:1401:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int ffs_dma_resv_lock(struct dma_buf *dmabuf, bool nonblock)
   ^
   static 
   13 warnings generated.


vim +/ffs_dma_resv_lock +1401 drivers/usb/gadget/function/f_fs.c

  1400	
> 1401	int ffs_dma_resv_lock(struct dma_buf *dmabuf, bool nonblock)
  1402	{
  1403		int ret;
  1404	
  1405		ret = dma_resv_lock_interruptible(dmabuf->resv, NULL);
  1406		if (ret) {
  1407			if (ret != -EDEADLK)
  1408				goto out;
  1409			if (nonblock) {
  1410				ret = -EBUSY;
  1411				goto out;
  1412			}
  1413	
  1414			ret = dma_resv_lock_slow_interruptible(dmabuf->resv, NULL);
  1415		}
  1416	
  1417	out:
  1418		return ret;
  1419	}
  1420	

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