Re: [RFC PATCH 02/29] dma-fence: Add dma_fence_user_fence

[kernel test robot <lkp@intel.com>]

Hi Matthew,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on drm-xe/drm-xe-next]
[also build test ERROR on drm-exynos/exynos-drm-next linus/master drm/drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip v6.12 next-20241121]
[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/Matthew-Brost/dma-fence-Add-dma_fence_preempt-base-class/20241121-124856
base:   https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next
patch link:    https://lore.kernel.org/r/20241118233757.2374041-3-matthew.brost%40intel.com
patch subject: [RFC PATCH 02/29] dma-fence: Add dma_fence_user_fence
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20241122/202411220719.Zhxq1Vjq-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241122/202411220719.Zhxq1Vjq-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411220719.Zhxq1Vjq-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/dma-buf/dma-fence-user-fence.c:6:
   In file included from include/linux/dma-fence-user-fence.h:10:
   In file included from include/linux/iosys-map.h:10:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     548 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     561 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from drivers/dma-buf/dma-fence-user-fence.c:6:
   In file included from include/linux/dma-fence-user-fence.h:10:
   In file included from include/linux/iosys-map.h:10:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     574 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from drivers/dma-buf/dma-fence-user-fence.c:6:
   In file included from include/linux/dma-fence-user-fence.h:10:
   In file included from include/linux/iosys-map.h:10:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     595 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     605 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> drivers/dma-buf/dma-fence-user-fence.c:15:3: error: call to undeclared function 'writeq'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      15 |                 writeq(user_fence->seqno, user_fence->map.vaddr_iomem);
         |                 ^
   6 warnings and 1 error generated.


vim +/writeq +15 drivers/dma-buf/dma-fence-user-fence.c

     8	
     9	static void user_fence_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
    10	{
    11		struct dma_fence_user_fence *user_fence =
    12			container_of(cb, struct dma_fence_user_fence, cb);
    13	
    14		if (user_fence->map.is_iomem)
  > 15			writeq(user_fence->seqno, user_fence->map.vaddr_iomem);
    16		else
    17			*(u64 *)user_fence->map.vaddr = user_fence->seqno;
    18	
    19		dma_fence_user_fence_free(user_fence);
    20	}
    21	

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