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Tue, 28 Mar 2023 20:40:20 +0000 Date: Wed, 29 Mar 2023 04:40:18 +0800 From: kernel test robot To: Li Zhengyu Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Palmer Dabbelt Subject: arch/riscv/kernel/elf_kexec.c:185:16: warning: variable 'kernel_start' set but not used Message-ID: <202303290418.XvYFwNe4-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Li, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3a93e40326c8f470e71d20b4c42d36767450f38f commit: 838b3e28488f702e2b5477b393f009b2639d2b1a RISC-V: Load purgatory in kexec_file date: 10 months ago config: riscv-randconfig-r042-20230329 (https://download.01.org/0day-ci/archive/20230329/202303290418.XvYFwNe4-lkp@intel.com/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=838b3e28488f702e2b5477b393f009b2639d2b1a git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 838b3e28488f702e2b5477b393f009b2639d2b1a # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot | Link: https://lore.kernel.org/oe-kbuild-all/202303290418.XvYFwNe4-lkp@intel.com/ All warnings (new ones prefixed by >>): >> arch/riscv/kernel/elf_kexec.c:185:16: warning: variable 'kernel_start' set but not used [-Wunused-but-set-variable] unsigned long kernel_start; ^ 1 warning generated. vim +/kernel_start +185 arch/riscv/kernel/elf_kexec.c 174 175 static void *elf_kexec_load(struct kimage *image, char *kernel_buf, 176 unsigned long kernel_len, char *initrd, 177 unsigned long initrd_len, char *cmdline, 178 unsigned long cmdline_len) 179 { 180 int ret; 181 unsigned long old_kernel_pbase = ULONG_MAX; 182 unsigned long new_kernel_pbase = 0UL; 183 unsigned long initrd_pbase = 0UL; 184 unsigned long headers_sz; > 185 unsigned long kernel_start; 186 void *fdt, *headers; 187 struct elfhdr ehdr; 188 struct kexec_buf kbuf; 189 struct kexec_elf_info elf_info; 190 char *modified_cmdline = NULL; 191 192 ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info); 193 if (ret) 194 return ERR_PTR(ret); 195 196 ret = elf_find_pbase(image, kernel_len, &ehdr, &elf_info, 197 &old_kernel_pbase, &new_kernel_pbase); 198 if (ret) 199 goto out; 200 kernel_start = image->start; 201 pr_notice("The entry point of kernel at 0x%lx\n", image->start); 202 203 /* Add the kernel binary to the image */ 204 ret = riscv_kexec_elf_load(image, &ehdr, &elf_info, 205 old_kernel_pbase, new_kernel_pbase); 206 if (ret) 207 goto out; 208 209 kbuf.image = image; 210 kbuf.buf_min = new_kernel_pbase + kernel_len; 211 kbuf.buf_max = ULONG_MAX; 212 213 /* Add elfcorehdr */ 214 if (image->type == KEXEC_TYPE_CRASH) { 215 ret = prepare_elf_headers(&headers, &headers_sz); 216 if (ret) { 217 pr_err("Preparing elf core header failed\n"); 218 goto out; 219 } 220 221 kbuf.buffer = headers; 222 kbuf.bufsz = headers_sz; 223 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; 224 kbuf.memsz = headers_sz; 225 kbuf.buf_align = ELF_CORE_HEADER_ALIGN; 226 kbuf.top_down = true; 227 228 ret = kexec_add_buffer(&kbuf); 229 if (ret) { 230 vfree(headers); 231 goto out; 232 } 233 image->elf_headers = headers; 234 image->elf_load_addr = kbuf.mem; 235 image->elf_headers_sz = headers_sz; 236 237 pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n", 238 image->elf_load_addr, kbuf.bufsz, kbuf.memsz); 239 240 /* Setup cmdline for kdump kernel case */ 241 modified_cmdline = setup_kdump_cmdline(image, cmdline, 242 cmdline_len); 243 if (!modified_cmdline) { 244 pr_err("Setting up cmdline for kdump kernel failed\n"); 245 ret = -EINVAL; 246 goto out; 247 } 248 cmdline = modified_cmdline; 249 } 250 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests