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Message-ID: <202212150952.YHUSqqFi-lkp@intel.com>
Date:   Thu, 15 Dec 2022 09:08:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ben Skeggs <bskeggs@...hat.com>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Lyude Paul <lyude@...hat.com>
Subject: drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c:178:1: warning: no
 previous prototype for function 'gf100_fifo_nonstall_block'

Hi Ben,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   041fae9c105ae342a4245cf1e0dc56a23fbb9d3c
commit: d67f3b96462922713e77cddb9d6f4965606918fc drm/nouveau/fifo: tidy up non-stall intr handling
date:   5 weeks ago
config: s390-randconfig-r044-20221215
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 98b13979fb05f3ed288a900deb843e7b27589e58)
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d67f3b96462922713e77cddb9d6f4965606918fc
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout d67f3b96462922713e77cddb9d6f4965606918fc
        # 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 SHELL=/bin/bash drivers/gpu/drm/

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 >>):

   In file included from drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c:24:
   In file included from drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h:5:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/engine.h:5:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/device.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/oclass.h:3:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/os.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvif/os.h:8:
   In file included from include/linux/pci.h:39:
   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/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c:24:
   In file included from drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h:5:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/engine.h:5:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/device.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/oclass.h:3:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/os.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvif/os.h:8:
   In file included from include/linux/pci.h:39:
   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/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c:24:
   In file included from drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h:5:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/engine.h:5:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/device.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/oclass.h:3:
   In file included from drivers/gpu/drm/nouveau/include/nvkm/core/os.h:4:
   In file included from drivers/gpu/drm/nouveau/include/nvif/os.h:8:
   In file included from include/linux/pci.h:39:
   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/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c:178:1: warning: no previous prototype for function 'gf100_fifo_nonstall_block' [-Wmissing-prototypes]
   gf100_fifo_nonstall_block(struct nvkm_event *event, int type, int index)
   ^
   drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c:177:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void
   ^
   static 
   13 warnings generated.


vim +/gf100_fifo_nonstall_block +178 drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c

   176	
   177	void
 > 178	gf100_fifo_nonstall_block(struct nvkm_event *event, int type, int index)
   179	{
   180		struct nvkm_fifo *fifo = container_of(event, typeof(*fifo), nonstall.event);
   181		unsigned long flags;
   182	
   183		spin_lock_irqsave(&fifo->lock, flags);
   184		nvkm_mask(fifo->engine.subdev.device, 0x002140, 0x80000000, 0x00000000);
   185		spin_unlock_irqrestore(&fifo->lock, flags);
   186	}
   187	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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