[drm-xe:drm-xe-next 989/1016] drivers/gpu/drm/xe/xe_wait_user_fence.c:46:2: warning: variable 'passed' is used uninitialized whenever switch default is taken

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

tree:   https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next
head:   c54005fdd0347a17088e7ff78070a55bf9103bc4
commit: ad7d86415578e1a5deedb0ceed5c281f7367d66d [989/1016] drm/xe: Enable W=1 warnings by default
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20231217/202312170357.KPSinwPs-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231217/202312170357.KPSinwPs-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/202312170357.KPSinwPs-lkp@intel.com/

All warnings (new ones prefixed by >>):

   warning: unknown warning option '-Wrestrict' [-Wunknown-warning-option]
   warning: unknown warning option '-Wpacked-not-aligned'; did you mean '-Wpacked-non-pod'? [-Wunknown-warning-option]
   warning: unknown warning option '-Wformat-overflow'; did you mean '-Wshift-overflow'? [-Wunknown-warning-option]
   warning: unknown warning option '-Wformat-truncation' [-Wunknown-warning-option]
   warning: unknown warning option '-Wstringop-overflow'; did you mean '-Wshift-overflow'? [-Wunknown-warning-option]
   warning: unknown warning option '-Wstringop-truncation'; did you mean '-Wstring-concatenation'? [-Wunknown-warning-option]
>> drivers/gpu/drm/xe/xe_wait_user_fence.c:46:2: warning: variable 'passed' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized]
           default:
           ^~~~~~~
   drivers/gpu/drm/xe/xe_wait_user_fence.c:50:9: note: uninitialized use occurs here
           return passed ? 0 : 1;
                  ^~~~~~
   drivers/gpu/drm/xe/xe_wait_user_fence.c:21:13: note: initialize the variable 'passed' to silence this warning
           bool passed;
                      ^
                       = 0
   7 warnings generated.


vim +/passed +46 drivers/gpu/drm/xe/xe_wait_user_fence.c

dd08ebf6c3525a Matthew Brost   2023-03-30  16  
dd08ebf6c3525a Matthew Brost   2023-03-30  17  static int do_compare(u64 addr, u64 value, u64 mask, u16 op)
dd08ebf6c3525a Matthew Brost   2023-03-30  18  {
dd08ebf6c3525a Matthew Brost   2023-03-30  19  	u64 rvalue;
dd08ebf6c3525a Matthew Brost   2023-03-30  20  	int err;
dd08ebf6c3525a Matthew Brost   2023-03-30  21  	bool passed;
dd08ebf6c3525a Matthew Brost   2023-03-30  22  
dd08ebf6c3525a Matthew Brost   2023-03-30  23  	err = copy_from_user(&rvalue, u64_to_user_ptr(addr), sizeof(rvalue));
dd08ebf6c3525a Matthew Brost   2023-03-30  24  	if (err)
dd08ebf6c3525a Matthew Brost   2023-03-30  25  		return -EFAULT;
dd08ebf6c3525a Matthew Brost   2023-03-30  26  
dd08ebf6c3525a Matthew Brost   2023-03-30  27  	switch (op) {
76d52e37187b73 Rodrigo Vivi    2023-11-14  28  	case DRM_XE_UFENCE_WAIT_OP_EQ:
dd08ebf6c3525a Matthew Brost   2023-03-30  29  		passed = (rvalue & mask) == (value & mask);
dd08ebf6c3525a Matthew Brost   2023-03-30  30  		break;
76d52e37187b73 Rodrigo Vivi    2023-11-14  31  	case DRM_XE_UFENCE_WAIT_OP_NEQ:
dd08ebf6c3525a Matthew Brost   2023-03-30  32  		passed = (rvalue & mask) != (value & mask);
dd08ebf6c3525a Matthew Brost   2023-03-30  33  		break;
76d52e37187b73 Rodrigo Vivi    2023-11-14  34  	case DRM_XE_UFENCE_WAIT_OP_GT:
dd08ebf6c3525a Matthew Brost   2023-03-30  35  		passed = (rvalue & mask) > (value & mask);
dd08ebf6c3525a Matthew Brost   2023-03-30  36  		break;
76d52e37187b73 Rodrigo Vivi    2023-11-14  37  	case DRM_XE_UFENCE_WAIT_OP_GTE:
dd08ebf6c3525a Matthew Brost   2023-03-30  38  		passed = (rvalue & mask) >= (value & mask);
dd08ebf6c3525a Matthew Brost   2023-03-30  39  		break;
76d52e37187b73 Rodrigo Vivi    2023-11-14  40  	case DRM_XE_UFENCE_WAIT_OP_LT:
dd08ebf6c3525a Matthew Brost   2023-03-30  41  		passed = (rvalue & mask) < (value & mask);
dd08ebf6c3525a Matthew Brost   2023-03-30  42  		break;
76d52e37187b73 Rodrigo Vivi    2023-11-14  43  	case DRM_XE_UFENCE_WAIT_OP_LTE:
dd08ebf6c3525a Matthew Brost   2023-03-30  44  		passed = (rvalue & mask) <= (value & mask);
dd08ebf6c3525a Matthew Brost   2023-03-30  45  		break;
dd08ebf6c3525a Matthew Brost   2023-03-30 @46  	default:
5e0e3070659519 Francois Dugast 2023-07-27  47  		XE_WARN_ON("Not possible");
dd08ebf6c3525a Matthew Brost   2023-03-30  48  	}
dd08ebf6c3525a Matthew Brost   2023-03-30  49  
dd08ebf6c3525a Matthew Brost   2023-03-30  50  	return passed ? 0 : 1;
dd08ebf6c3525a Matthew Brost   2023-03-30  51  }
dd08ebf6c3525a Matthew Brost   2023-03-30  52  

:::::: The code at line 46 was first introduced by commit
:::::: dd08ebf6c3525a7ea2186e636df064ea47281987 drm/xe: Introduce a new DRM driver for Intel GPUs

:::::: TO: Matthew Brost <matthew.brost@intel.com>
:::::: CC: Rodrigo Vivi <rodrigo.vivi@intel.com>

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