[PATCH 1/2] drm/panic: Add a drm panic handler
kernel test robot
lkp at intel.com
Thu Aug 10 06:24:47 UTC 2023
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@intel.com/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@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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308101423.GSvLgbbe-lkp@intel.com/
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 {
--
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