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Message-ID: <202512172102.OcUspn1Z-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ea1013c1539270e372fc99854bc6e4d94eaeff66 commit: f41ceff1748612b9e1538becc13dc2f1617d9d14 Drivers: hv: Enable VTL mode for arm64 date: 7 months ago config: arm64-randconfig-r072-20251216 (https://download.01.org/0day-ci/archive/20251217/202512172102.OcUspn1Z-lkp@intel.com/config) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 1335a05ab8bc8339ce24be3a9da89d8c3f4e0571) 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202512172102.OcUspn1Z-lkp@intel.com/ smatch warnings: drivers/hv/hv_common.c:242 hv_kmsg_dump() error: uninitialized symbol 'bytes_written'. vim +/bytes_written +242 drivers/hv/hv_common.c 9c318a1d9b5000 Long Li 2023-04-20 225 static void hv_kmsg_dump(struct kmsg_dumper *dumper, e1a261ba599eec Jocelyn Falempe 2024-07-02 226 struct kmsg_dump_detail *detail) 9c318a1d9b5000 Long Li 2023-04-20 227 { 9c318a1d9b5000 Long Li 2023-04-20 228 struct kmsg_dump_iter iter; 9c318a1d9b5000 Long Li 2023-04-20 229 size_t bytes_written; 9c318a1d9b5000 Long Li 2023-04-20 230 9c318a1d9b5000 Long Li 2023-04-20 231 /* We are only interested in panics. */ e1a261ba599eec Jocelyn Falempe 2024-07-02 232 if (detail->reason != KMSG_DUMP_PANIC || !sysctl_record_panic_msg) 9c318a1d9b5000 Long Li 2023-04-20 233 return; 9c318a1d9b5000 Long Li 2023-04-20 234 9c318a1d9b5000 Long Li 2023-04-20 235 /* 9c318a1d9b5000 Long Li 2023-04-20 236 * Write dump contents to the page. No need to synchronize; panic should 9c318a1d9b5000 Long Li 2023-04-20 237 * be single-threaded. 9c318a1d9b5000 Long Li 2023-04-20 238 */ 9c318a1d9b5000 Long Li 2023-04-20 239 kmsg_dump_rewind(&iter); 9c318a1d9b5000 Long Li 2023-04-20 240 kmsg_dump_get_buffer(&iter, false, hv_panic_page, HV_HYP_PAGE_SIZE, 9c318a1d9b5000 Long Li 2023-04-20 241 &bytes_written); kmsg_dump_get_buffer() is a no-op if CONFIG_PRINTK is disabled. 9c318a1d9b5000 Long Li 2023-04-20 @242 if (!bytes_written) ^^^^^^^^^^^^^^ uninitialized. 9c318a1d9b5000 Long Li 2023-04-20 243 return; 9c318a1d9b5000 Long Li 2023-04-20 244 /* 9c318a1d9b5000 Long Li 2023-04-20 245 * P3 to contain the physical address of the panic page & P4 to 9c318a1d9b5000 Long Li 2023-04-20 246 * contain the size of the panic data in that page. Rest of the 9c318a1d9b5000 Long Li 2023-04-20 247 * registers are no-op when the NOTIFY_MSG flag is set. 9c318a1d9b5000 Long Li 2023-04-20 248 */ 0e3f7d120086c8 Nuno Das Neves 2024-02-20 249 hv_set_msr(HV_MSR_CRASH_P0, 0); 0e3f7d120086c8 Nuno Das Neves 2024-02-20 250 hv_set_msr(HV_MSR_CRASH_P1, 0); 0e3f7d120086c8 Nuno Das Neves 2024-02-20 251 hv_set_msr(HV_MSR_CRASH_P2, 0); 0e3f7d120086c8 Nuno Das Neves 2024-02-20 252 hv_set_msr(HV_MSR_CRASH_P3, virt_to_phys(hv_panic_page)); 0e3f7d120086c8 Nuno Das Neves 2024-02-20 253 hv_set_msr(HV_MSR_CRASH_P4, bytes_written); 9c318a1d9b5000 Long Li 2023-04-20 254 9c318a1d9b5000 Long Li 2023-04-20 255 /* 9c318a1d9b5000 Long Li 2023-04-20 256 * Let Hyper-V know there is crash data available along with 9c318a1d9b5000 Long Li 2023-04-20 257 * the panic message. 9c318a1d9b5000 Long Li 2023-04-20 258 */ 0e3f7d120086c8 Nuno Das Neves 2024-02-20 259 hv_set_msr(HV_MSR_CRASH_CTL, 9c318a1d9b5000 Long Li 2023-04-20 260 (HV_CRASH_CTL_CRASH_NOTIFY | 9c318a1d9b5000 Long Li 2023-04-20 261 HV_CRASH_CTL_CRASH_NOTIFY_MSG)); 9c318a1d9b5000 Long Li 2023-04-20 262 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki