tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 18445bf405cb331117bc98427b1ba6f12418ad17 commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces date: 9 weeks ago config: arm64-randconfig-s031-20200819 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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: v0.6.2-183-gaa6ede3b-dirty git checkout 670d0a4b10704667765f7d18f7592993d02783aa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 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/mx3fb.c:1336:26: sparse: got void * drivers/video/fbdev/mx3fb.c:1377:56: sparse: expected void *cpu_addr drivers/video/fbdev/mx3fb.c:1094:25: sparse: sparse: cast removes address space '__iomem' of expression # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 670d0a4b10704667765f7d18f7592993d02783aa vim +1336 drivers/video/fbdev/mx3fb.c 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1313 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1314 /* 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1315 * Main framebuffer functions 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1316 */ 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1317 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1318 /** 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1319 * mx3fb_map_video_memory() - allocates the DRAM memory for the frame buffer. 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1320 * @fbi: framebuffer information pointer 537a1bf059fa31 drivers/video/mx3fb.c Krzysztof Helt 2009-06-30 1321 * @mem_len: length of mapped memory 20de03dae54e10 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-08-06 1322 * @lock: do not lock during initialisation 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1323 * @return: Error code indicating success or failure 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1324 * 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1325 * This buffer is remapped into a non-cached, non-buffered, memory region to 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1326 * allow palette and pixel writes to occur without flushing the cache. Once this 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1327 * area is remapped, all virtual memory access to the video memory should occur 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1328 * at the new region. 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1329 */ 20de03dae54e10 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-08-06 1330 static int mx3fb_map_video_memory(struct fb_info *fbi, unsigned int mem_len, 20de03dae54e10 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-08-06 1331 bool lock) 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1332 { 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1333 int retval = 0; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1334 dma_addr_t addr; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1335 f6e45661f9be54 drivers/video/fbdev/mx3fb.c Luis R. Rodriguez 2016-01-22 @1336 fbi->screen_base = dma_alloc_wc(fbi->device, mem_len, &addr, f6e45661f9be54 drivers/video/fbdev/mx3fb.c Luis R. Rodriguez 2016-01-22 1337 GFP_DMA | GFP_KERNEL); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1338 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1339 if (!fbi->screen_base) { 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1340 dev_err(fbi->device, "Cannot allocate %u bytes framebuffer memory\n", 537a1bf059fa31 drivers/video/mx3fb.c Krzysztof Helt 2009-06-30 1341 mem_len); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1342 retval = -EBUSY; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1343 goto err0; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1344 } 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1345 20de03dae54e10 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-08-06 1346 if (lock) 537a1bf059fa31 drivers/video/mx3fb.c Krzysztof Helt 2009-06-30 1347 mutex_lock(&fbi->mm_lock); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1348 fbi->fix.smem_start = addr; 537a1bf059fa31 drivers/video/mx3fb.c Krzysztof Helt 2009-06-30 1349 fbi->fix.smem_len = mem_len; 20de03dae54e10 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-08-06 1350 if (lock) 537a1bf059fa31 drivers/video/mx3fb.c Krzysztof Helt 2009-06-30 1351 mutex_unlock(&fbi->mm_lock); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1352 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1353 dev_dbg(fbi->device, "allocated fb @ p=0x%08x, v=0x%p, size=%d.\n", 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1354 (uint32_t) fbi->fix.smem_start, fbi->screen_base, fbi->fix.smem_len); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1355 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1356 fbi->screen_size = fbi->fix.smem_len; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1357 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1358 /* Clear the screen */ 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 @1359 memset((char *)fbi->screen_base, 0, fbi->fix.smem_len); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1360 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1361 return 0; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1362 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1363 err0: 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1364 fbi->fix.smem_len = 0; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1365 fbi->fix.smem_start = 0; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1366 fbi->screen_base = NULL; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1367 return retval; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1368 } 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1369 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1370 /** 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1371 * mx3fb_unmap_video_memory() - de-allocate frame buffer memory. 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1372 * @fbi: framebuffer information pointer 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1373 * @return: error code indicating success or failure 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1374 */ 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1375 static int mx3fb_unmap_video_memory(struct fb_info *fbi) 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1376 { f6e45661f9be54 drivers/video/fbdev/mx3fb.c Luis R. Rodriguez 2016-01-22 @1377 dma_free_wc(fbi->device, fbi->fix.smem_len, fbi->screen_base, f6e45661f9be54 drivers/video/fbdev/mx3fb.c Luis R. Rodriguez 2016-01-22 1378 fbi->fix.smem_start); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1379 f3d8496e9c8418 drivers/video/mx3fb.c Fabio Estevam 2013-02-21 1380 fbi->screen_base = NULL; 537a1bf059fa31 drivers/video/mx3fb.c Krzysztof Helt 2009-06-30 1381 mutex_lock(&fbi->mm_lock); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1382 fbi->fix.smem_start = 0; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1383 fbi->fix.smem_len = 0; 537a1bf059fa31 drivers/video/mx3fb.c Krzysztof Helt 2009-06-30 1384 mutex_unlock(&fbi->mm_lock); 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1385 return 0; 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1386 } 86528da229a448 drivers/video/mx3fb.c Guennadi Liakhovetski 2009-01-21 1387 :::::: The code at line 1336 was first introduced by commit :::::: f6e45661f9be546811b62b2b01f32f4bf0c436c0 dma, mm/pat: Rename dma_*_writecombine() to dma_*_wc() :::::: TO: Luis R. Rodriguez <mcgrof(a)suse.com&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org