tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kspp/memcpy/next-20210803/v2-devel head: 4752984fc24104f399e70f99d48afa047d86a381 commit: 28c76742b0c2f562e9cdc38621f12b4c10ee22db [70/86] fortify: Detect struct member overflows in memset() at compile-time config: powerpc-randconfig-s031-20210810 (attached as .config) compiler: powerpc-linux-gcc (GCC) 10.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id... git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees kspp/memcpy/next-20210803/v2-devel git checkout 28c76742b0c2f562e9cdc38621f12b4c10ee22db # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/video/fbdev/atmel_lcdfb.c:354:27: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected char [noderef] __iomem *screen_base @@ got void * @@ drivers/video/fbdev/atmel_lcdfb.c:354:27: sparse: expected char [noderef] __iomem *screen_base drivers/video/fbdev/atmel_lcdfb.c:354:27: sparse: got void * drivers/video/fbdev/atmel_lcdfb.c:362:9: sparse: expected void const * drivers/video/fbdev/atmel_lcdfb.c:362:9: sparse: got char [noderef] __iomem *screen_base drivers/video/fbdev/atmel_lcdfb.c:362:9: sparse: expected void const * drivers/video/fbdev/atmel_lcdfb.c:362:9: sparse: got char [noderef] __iomem *screen_base drivers/video/fbdev/atmel_lcdfb.c:362:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void * @@ got char [noderef] __iomem *screen_base @@ drivers/video/fbdev/atmel_lcdfb.c:362:9: sparse: expected void * drivers/video/fbdev/atmel_lcdfb.c:362:9: sparse: got char [noderef] __iomem *screen_base drivers/video/fbdev/atmel_lcdfb.c:333:59: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void *cpu_addr @@ got char [noderef] __iomem *screen_base @@ drivers/video/fbdev/atmel_lcdfb.c:333:59: sparse: expected void *cpu_addr drivers/video/fbdev/atmel_lcdfb.c:333:59: sparse: got char [noderef] __iomem *screen_base drivers/video/fbdev/atmel_lcdfb.c:333:59: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void *cpu_addr @@ got char [noderef] __iomem *screen_base @@ drivers/video/fbdev/atmel_lcdfb.c:333:59: sparse: expected void *cpu_addr drivers/video/fbdev/atmel_lcdfb.c:333:59: sparse: got char [noderef] __iomem *screen_base vim +362 drivers/video/fbdev/atmel_lcdfb.c 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 336 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 337 /** 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 338 * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 339 * @sinfo: the frame buffer to allocate memory for 1d01e83557105e drivers/video/atmel_lcdfb.c Krzysztof Helt 2009-07-08 340 * 1d01e83557105e drivers/video/atmel_lcdfb.c Krzysztof Helt 2009-07-08 341 * This function is called only from the atmel_lcdfb_probe() 1d01e83557105e drivers/video/atmel_lcdfb.c Krzysztof Helt 2009-07-08 342 * so no locking by fb_info->mm_lock around smem_len setting is needed. 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 343 */ 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 344 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo) 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 345 { 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 346 struct fb_info *info = sinfo->info; 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 347 struct fb_var_screeninfo *var = &info->var; ea757acad5a518 drivers/video/atmel_lcdfb.c Haavard Skinnemoen 2008-08-12 348 unsigned int smem_len; 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 349 ea757acad5a518 drivers/video/atmel_lcdfb.c Haavard Skinnemoen 2008-08-12 350 smem_len = (var->xres_virtual * var->yres_virtual 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 351 * ((var->bits_per_pixel + 7) / 8)); ea757acad5a518 drivers/video/atmel_lcdfb.c Haavard Skinnemoen 2008-08-12 352 info->fix.smem_len = max(smem_len, sinfo->smem_len); 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 353 f6e45661f9be54 drivers/video/fbdev/atmel_lcdfb.c Luis R. Rodriguez 2016-01-22 354 info->screen_base = dma_alloc_wc(info->device, info->fix.smem_len, f6e45661f9be54 drivers/video/fbdev/atmel_lcdfb.c Luis R. Rodriguez 2016-01-22 355 (dma_addr_t *)&info->fix.smem_start, f6e45661f9be54 drivers/video/fbdev/atmel_lcdfb.c Luis R. Rodriguez 2016-01-22 356 GFP_KERNEL); 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 357 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 358 if (!info->screen_base) { 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 359 return -ENOMEM; 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 360 } 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 361 01d3a5e7fab773 drivers/video/atmel_lcdfb.c Haavard Skinnemoen 2008-04-28 @362 memset(info->screen_base, 0, info->fix.smem_len); 01d3a5e7fab773 drivers/video/atmel_lcdfb.c Haavard Skinnemoen 2008-04-28 363 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 364 return 0; 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 365 } 14340586148e7c drivers/video/atmel_lcdfb.c Nicolas Ferre 2007-05-10 366 :::::: The code at line 362 was first introduced by commit :::::: 01d3a5e7fab7732cfc5d5d4533e9378ea435295a atmel_lcdfb: don't initialize a pre-allocated framebuffer :::::: TO: Haavard Skinnemoen <hskinnemoen(a)atmel.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org