[Intel-gfx] [PATCH 3/3] drm/i915/perf: Map OA buffer to user space for gen12 performance query

[kernel test robot]

Hi Umesh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on drm-tip/drm-tip v5.8-rc5 next-20200716]
[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]

url:    https://github.com/0day-ci/linux/commits/Umesh-Nerlige-Ramappa/drm-i915-perf-Whitelist-OA-report-trigger-registers/20200717-095850
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/i915/i915_perf.c:1642:5: warning: no previous prototype for function 'i915_perf_mmap' [-Wmissing-prototypes]
   int i915_perf_mmap(struct file *file, struct vm_area_struct *vma)
       ^
   drivers/gpu/drm/i915/i915_perf.c:1642:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int i915_perf_mmap(struct file *file, struct vm_area_struct *vma)
   ^
   static 
   1 warning generated.

vim +/i915_perf_mmap +1642 drivers/gpu/drm/i915/i915_perf.c

  1641	
> 1642	int i915_perf_mmap(struct file *file, struct vm_area_struct *vma)
  1643	{
  1644		struct i915_perf_stream *stream = file->private_data;
  1645	
  1646		if (vma->vm_end < vma->vm_start)
  1647			return -EINVAL;
  1648	
  1649		if ((vma->vm_end - vma->vm_start) > OA_BUFFER_SIZE)
  1650			return -EINVAL;
  1651	
  1652		if (vma->vm_flags & VM_WRITE)
  1653			return -EINVAL;
  1654	
  1655		if (vma->vm_pgoff != I915_PERF_OA_BUFFER_MMAP_OFFSET)
  1656			return -EINVAL;
  1657	
  1658		vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC | VM_MAYSHARE);
  1659		vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
  1660		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
  1661		vma->vm_private_data = stream;
  1662		vma->vm_ops = &vm_ops_oa;
  1663	
  1664		return 0;
  1665	}
  1666	

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