Hi Jocelyn, kernel test robot noticed the following build warnings: [auto build test WARNING on 6995e2de6891c724bfeb2db33d7b87775f913ad1] url: https://github.com/intel-lab-lkp/linux/commits/Jocelyn-Falempe/drm-panic-Add-a-drm-panic-handler/20230810-032733 base: 6995e2de6891c724bfeb2db33d7b87775f913ad1 patch link: https://lore.kernel.org/r/20230809192514.158062-2-jfalempe%40redhat.com patch subject: [PATCH 1/2] drm/panic: Add a drm panic handler config: s390-randconfig-r044-20230809 (https://download.01.org/0day-ci/archive/20230810/202308101423.GSvLgbbe-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce: (https://download.01.org/0day-ci/archive/20230810/202308101423.GSvLgbbe-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202308101423.GSvLgbbe-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/drm_panic.c:9: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 547 | val = __raw_readb(PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) | ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' 102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) | ^ In file included from drivers/gpu/drm/drm_panic.c:9: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) | ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' 115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) | ^ In file included from drivers/gpu/drm/drm_panic.c:9: In file included from include/linux/iosys-map.h:10: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 584 | __raw_writeb(value, PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 692 | readsb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 700 | readsw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 708 | readsl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 717 | writesb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 726 | writesw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 735 | writesl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ >> drivers/gpu/drm/drm_panic.c:246:6: warning: no previous prototype for function 'drm_panic_init_client' [-Wmissing-prototypes] 246 | void drm_panic_init_client(struct drm_device *dev) | ^ drivers/gpu/drm/drm_panic.c:246:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 246 | void drm_panic_init_client(struct drm_device *dev) | ^ | static >> drivers/gpu/drm/drm_panic.c:272:6: warning: no previous prototype for function 'drm_panic_init' [-Wmissing-prototypes] 272 | void drm_panic_init(void) | ^ drivers/gpu/drm/drm_panic.c:272:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 272 | void drm_panic_init(void) | ^ | static >> drivers/gpu/drm/drm_panic.c:282:6: warning: no previous prototype for function 'drm_panic_exit' [-Wmissing-prototypes] 282 | void drm_panic_exit(void) | ^ drivers/gpu/drm/drm_panic.c:282:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 282 | void drm_panic_exit(void) | ^ | static 15 warnings generated. -- >> drivers/gpu/drm/drm_panic.c:28: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * This module displays a user friendly message on screen when a kernel panic drivers/gpu/drm/drm_panic.c:36: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * List of drm clients >> drivers/gpu/drm/drm_panic.c:283: warning: expecting prototype for drm_log_exit(). Prototype was for drm_panic_exit() instead vim +/drm_panic_init_client +246 drivers/gpu/drm/drm_panic.c 245 > 246 void drm_panic_init_client(struct drm_device *dev) 247 { 248 struct dpanic_drm_client *new; 249 int ret; 250 251 new = kzalloc(sizeof(*new), GFP_KERNEL); 252 if (!new) 253 return; 254 255 ret = drm_client_init(dev, &new->client, "drm_panic", NULL); 256 if (ret < 0) { 257 kfree(new); 258 return; 259 } 260 drm_client_register(&new->client); 261 list_add_tail(&new->head, &dpanic_clients); 262 263 drm_info(dev, "Registered with drm panic\n"); 264 } 265 EXPORT_SYMBOL(drm_panic_init_client); 266 267 /** 268 * drm_panic_init() - Initialize drm-panic subsystem 269 * 270 * register the panic notifier 271 */ > 272 void drm_panic_init(void) 273 { 274 /* register panic handler */ 275 atomic_notifier_chain_register(&panic_notifier_list, 276 &drm_panic_notifier); 277 } 278 279 /** 280 * drm_log_exit() - Shutdown drm-panic subsystem 281 */ > 282 void drm_panic_exit(void) > 283 { -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
