Re: [PATCH] drm/shmem-helper: Add huge page fault handler

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

Hi Loïc,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.17-rc7 next-20250923]
[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/Lo-c-Molinari/drm-shmem-helper-Add-huge-page-fault-handler/20250923-175753
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20250923095634.50051-1-loic.molinari%40collabora.com
patch subject: [PATCH] drm/shmem-helper: Add huge page fault handler
config: i386-buildonly-randconfig-002-20250924 (https://download.01.org/0day-ci/archive/20250924/202509241315.8jjCyL7U-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250924/202509241315.8jjCyL7U-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/202509241315.8jjCyL7U-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/drm_gem_shmem_helper.c:595:2: warning: label at end of compound statement is a C23 extension [-Wc23-extensions]
     595 |         }
         |         ^
   drivers/gpu/drm/drm_gem_shmem_helper.c:548:21: warning: unused variable 'paddr' [-Wunused-variable]
     548 |         unsigned long pfn, paddr;
         |                            ^~~~~
>> drivers/gpu/drm/drm_gem_shmem_helper.c:594:2: warning: variable 'ret' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized]
     594 |         default:
         |         ^~~~~~~
   drivers/gpu/drm/drm_gem_shmem_helper.c:600:9: note: uninitialized use occurs here
     600 |         return ret;
         |                ^~~
   drivers/gpu/drm/drm_gem_shmem_helper.c:545:16: note: initialize the variable 'ret' to silence this warning
     545 |         vm_fault_t ret;
         |                       ^
         |                        = 0
   3 warnings generated.


vim +595 drivers/gpu/drm/drm_gem_shmem_helper.c

2194a63a818db71 Noralf Trønnes  2019-03-12  593  
16bf6748ef6aaf1 Loïc Molinari   2025-09-23 @594  	default:
d611b4a0907cece Neil Roberts    2021-02-23 @595  	}
d611b4a0907cece Neil Roberts    2021-02-23  596  
16bf6748ef6aaf1 Loïc Molinari   2025-09-23  597   out:
21aa27ddc582693 Dmitry Osipenko 2023-05-30  598  	dma_resv_unlock(shmem->base.resv);
d611b4a0907cece Neil Roberts    2021-02-23  599  
d611b4a0907cece Neil Roberts    2021-02-23  600  	return ret;
2194a63a818db71 Noralf Trønnes  2019-03-12  601  }
2194a63a818db71 Noralf Trønnes  2019-03-12  602  

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