Hi Loïc, kernel test robot noticed the following build errors:
[auto build test ERROR on drm-misc/drm-misc-next] [also build test ERROR on linus/master v6.17 next-20251009] [cannot apply to akpm-mm/mm-everything] [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/20251004-173347 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next patch link: https://lore.kernel.org/r/20251004093054.21388-3-loic.molinari%40collabora.com patch subject: [PATCH v3 02/10] drm/gem: Introduce drm_gem_get_unmapped_area() fop config: riscv-randconfig-001-20251010 (https://download.01.org/0day-ci/archive/20251010/[email protected]/config) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 39f292ffa13d7ca0d1edff27ac8fd55024bb4d19) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251010/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All errors (new ones prefixed by >>): In file included from drivers/gpu/drm/drm_gem.c:28: In file included from include/linux/dma-buf.h:16: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:12: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:804:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 804 | insb(addr, buffer, count); | ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb' 104 | #define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count) | ~~~~~~~~~~ ^ In file included from drivers/gpu/drm/drm_gem.c:28: In file included from include/linux/dma-buf.h:16: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:12: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:812:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 812 | insw(addr, buffer, count); | ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw' 105 | #define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count) | ~~~~~~~~~~ ^ In file included from drivers/gpu/drm/drm_gem.c:28: In file included from include/linux/dma-buf.h:16: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:12: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:820:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 820 | insl(addr, buffer, count); | ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl' 106 | #define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count) | ~~~~~~~~~~ ^ In file included from drivers/gpu/drm/drm_gem.c:28: In file included from include/linux/dma-buf.h:16: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:12: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:829:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 829 | outsb(addr, buffer, count); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb' 118 | #define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count) | ~~~~~~~~~~ ^ In file included from drivers/gpu/drm/drm_gem.c:28: In file included from include/linux/dma-buf.h:16: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:12: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:838:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 838 | outsw(addr, buffer, count); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw' 119 | #define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count) | ~~~~~~~~~~ ^ In file included from drivers/gpu/drm/drm_gem.c:28: In file included from include/linux/dma-buf.h:16: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:12: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:847:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 847 | outsl(addr, buffer, count); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl' 120 | #define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count) | ~~~~~~~~~~ ^ In file included from drivers/gpu/drm/drm_gem.c:28: In file included from include/linux/dma-buf.h:16: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:12: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:1175:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 1175 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; | ~~~~~~~~~~ ^ >> drivers/gpu/drm/drm_gem.c:1271:10: error: call to undeclared function >> 'mm_get_unmapped_area'; ISO C99 and later do not support implicit function >> declarations [-Wimplicit-function-declaration] 1271 | return mm_get_unmapped_area(current->mm, filp, uaddr, len, 0, | ^ drivers/gpu/drm/drm_gem.c:1271:10: note: did you mean '__get_unmapped_area'? include/linux/mm.h:3337:1: note: '__get_unmapped_area' declared here 3337 | __get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, | ^ 7 warnings and 1 error generated. vim +/mm_get_unmapped_area +1271 drivers/gpu/drm/drm_gem.c 1239 1240 /** 1241 * drm_gem_get_unmapped_area - get memory mapping region routine for GEM objects 1242 * @filp: DRM file pointer 1243 * @uaddr: User address hint 1244 * @len: Mapping length 1245 * @pgoff: Offset (in pages) 1246 * @flags: Mapping flags 1247 * 1248 * If a driver supports GEM object mapping, before ending up in drm_gem_mmap(), 1249 * mmap calls on the DRM file descriptor will first try to find a free linear 1250 * address space large enough for a mapping. Since GEM objects are backed by 1251 * shmem buffers, this should preferably be handled by the shmem virtual memory 1252 * filesystem which can appropriately align addresses to huge page sizes when 1253 * needed. 1254 * 1255 * Look up the GEM object based on the offset passed in (vma->vm_pgoff will 1256 * contain the fake offset we created) and call shmem_get_unmapped_area() with 1257 * the right file pointer. 1258 * 1259 * If a GEM object is not available at the given offset or if the caller is not 1260 * granted access to it, fall back to mm_get_unmapped_area(). 1261 */ 1262 unsigned long drm_gem_get_unmapped_area(struct file *filp, unsigned long uaddr, 1263 unsigned long len, unsigned long pgoff, 1264 unsigned long flags) 1265 { 1266 struct drm_gem_object *obj; 1267 unsigned long ret; 1268 1269 obj = drm_gem_object_lookup_from_offset(filp, pgoff, len >> PAGE_SHIFT); 1270 if (IS_ERR(obj)) > 1271 return mm_get_unmapped_area(current->mm, filp, uaddr, > len, 0, 1272 flags); 1273 1274 ret = shmem_get_unmapped_area(obj->filp, uaddr, len, 0, flags); 1275 1276 drm_gem_object_put(obj); 1277 1278 return ret; 1279 } 1280 EXPORT_SYMBOL(drm_gem_get_unmapped_area); 1281 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
