Hi Yimin, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 commit: b5e2c507b06c9d36411845149162a804ae7b04a9 riscv: Kconfig: Allow RV32 to build with no MMU date: 7 weeks ago config: riscv-randconfig-s041-20230517 compiler: riscv32-linux-gcc (GCC) 12.1.0 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: v0.6.4-39-gce1a6720-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b5e2c507b06c9d36411845149162a804ae7b04a9 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout b5e2c507b06c9d36411845149162a804ae7b04a9 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/mm/ fs/ext4/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202305171743.3LP5XWzV-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) WARNING: invalid argument to '-march': '_zihintpause' >> arch/riscv/mm/init.c:1204:48: sparse: sparse: cast truncates bits from constant value (100000000 becomes 0) -- WARNING: invalid argument to '-march': '_zihintpause' fs/ext4/mballoc.c: note: in included file (through include/linux/timex.h, include/linux/time32.h, include/linux/time.h, ...): >> arch/riscv/include/asm/timex.h:25:16: sparse: sparse: cast removes address space '__iomem' of expression >> arch/riscv/include/asm/timex.h:25:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got unsigned int [usertype] * @@ arch/riscv/include/asm/timex.h:25:16: sparse: expected void const volatile [noderef] __iomem *addr arch/riscv/include/asm/timex.h:25:16: sparse: got unsigned int [usertype] * >> arch/riscv/include/asm/timex.h:25:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got unsigned int [usertype] * @@ arch/riscv/include/asm/timex.h:25:16: sparse: expected void const volatile [noderef] __iomem *addr arch/riscv/include/asm/timex.h:25:16: sparse: got unsigned int [usertype] * fs/ext4/mballoc.c:2942:13: sparse: sparse: context imbalance in 'ext4_mb_seq_structs_summary_start' - wrong count at exit vim +1204 arch/riscv/mm/init.c 671f9a3e2e24cd Anup Patel 2019-06-28 1154 e53d28180d4d0f Nick Kossifidis 2021-04-19 1155 /* e53d28180d4d0f Nick Kossifidis 2021-04-19 1156 * reserve_crashkernel() - reserves memory for crash kernel e53d28180d4d0f Nick Kossifidis 2021-04-19 1157 * e53d28180d4d0f Nick Kossifidis 2021-04-19 1158 * This function reserves memory area given in "crashkernel=" kernel command e53d28180d4d0f Nick Kossifidis 2021-04-19 1159 * line parameter. The memory reserved is used by dump capture kernel when e53d28180d4d0f Nick Kossifidis 2021-04-19 1160 * primary kernel is crashing. e53d28180d4d0f Nick Kossifidis 2021-04-19 1161 */ e53d28180d4d0f Nick Kossifidis 2021-04-19 1162 static void __init reserve_crashkernel(void) e53d28180d4d0f Nick Kossifidis 2021-04-19 1163 { e53d28180d4d0f Nick Kossifidis 2021-04-19 1164 unsigned long long crash_base = 0; e53d28180d4d0f Nick Kossifidis 2021-04-19 1165 unsigned long long crash_size = 0; e53d28180d4d0f Nick Kossifidis 2021-04-19 1166 unsigned long search_start = memblock_start_of_DRAM(); e53d28180d4d0f Nick Kossifidis 2021-04-19 1167 unsigned long search_end = memblock_end_of_DRAM(); e53d28180d4d0f Nick Kossifidis 2021-04-19 1168 e53d28180d4d0f Nick Kossifidis 2021-04-19 1169 int ret = 0; e53d28180d4d0f Nick Kossifidis 2021-04-19 1170 d414cb379ac35e Jisheng Zhang 2022-03-23 1171 if (!IS_ENABLED(CONFIG_KEXEC_CORE)) d414cb379ac35e Jisheng Zhang 2022-03-23 1172 return; 5640975003d023 Nick Kossifidis 2021-04-19 1173 /* 5640975003d023 Nick Kossifidis 2021-04-19 1174 * Don't reserve a region for a crash kernel on a crash kernel 5640975003d023 Nick Kossifidis 2021-04-19 1175 * since it doesn't make much sense and we have limited memory 5640975003d023 Nick Kossifidis 2021-04-19 1176 * resources. 5640975003d023 Nick Kossifidis 2021-04-19 1177 */ 5640975003d023 Nick Kossifidis 2021-04-19 1178 if (is_kdump_kernel()) { 5640975003d023 Nick Kossifidis 2021-04-19 1179 pr_info("crashkernel: ignoring reservation request\n"); 5640975003d023 Nick Kossifidis 2021-04-19 1180 return; 5640975003d023 Nick Kossifidis 2021-04-19 1181 } 5640975003d023 Nick Kossifidis 2021-04-19 1182 e53d28180d4d0f Nick Kossifidis 2021-04-19 1183 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), e53d28180d4d0f Nick Kossifidis 2021-04-19 1184 &crash_size, &crash_base); e53d28180d4d0f Nick Kossifidis 2021-04-19 1185 if (ret || !crash_size) e53d28180d4d0f Nick Kossifidis 2021-04-19 1186 return; e53d28180d4d0f Nick Kossifidis 2021-04-19 1187 e53d28180d4d0f Nick Kossifidis 2021-04-19 1188 crash_size = PAGE_ALIGN(crash_size); e53d28180d4d0f Nick Kossifidis 2021-04-19 1189 a7259df7670240 Mike Rapoport 2021-09-02 1190 if (crash_base) { a7259df7670240 Mike Rapoport 2021-09-02 1191 search_start = crash_base; a7259df7670240 Mike Rapoport 2021-09-02 1192 search_end = crash_base + crash_size; a7259df7670240 Mike Rapoport 2021-09-02 1193 } a7259df7670240 Mike Rapoport 2021-09-02 1194 e53d28180d4d0f Nick Kossifidis 2021-04-19 1195 /* e53d28180d4d0f Nick Kossifidis 2021-04-19 1196 * Current riscv boot protocol requires 2MB alignment for e53d28180d4d0f Nick Kossifidis 2021-04-19 1197 * RV64 and 4MB alignment for RV32 (hugepage size) decf89f86ecd3c Nick Kossifidis 2021-11-26 1198 * decf89f86ecd3c Nick Kossifidis 2021-11-26 1199 * Try to alloc from 32bit addressible physical memory so that decf89f86ecd3c Nick Kossifidis 2021-11-26 1200 * swiotlb can work on the crash kernel. e53d28180d4d0f Nick Kossifidis 2021-04-19 1201 */ decf89f86ecd3c Nick Kossifidis 2021-11-26 1202 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, decf89f86ecd3c Nick Kossifidis 2021-11-26 1203 search_start, decf89f86ecd3c Nick Kossifidis 2021-11-26 @1204 min(search_end, (unsigned long) SZ_4G)); decf89f86ecd3c Nick Kossifidis 2021-11-26 1205 if (crash_base == 0) { decf89f86ecd3c Nick Kossifidis 2021-11-26 1206 /* Try again without restricting region to 32bit addressible memory */ a7259df7670240 Mike Rapoport 2021-09-02 1207 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, a7259df7670240 Mike Rapoport 2021-09-02 1208 search_start, search_end); e53d28180d4d0f Nick Kossifidis 2021-04-19 1209 if (crash_base == 0) { e53d28180d4d0f Nick Kossifidis 2021-04-19 1210 pr_warn("crashkernel: couldn't allocate %lldKB\n", e53d28180d4d0f Nick Kossifidis 2021-04-19 1211 crash_size >> 10); e53d28180d4d0f Nick Kossifidis 2021-04-19 1212 return; e53d28180d4d0f Nick Kossifidis 2021-04-19 1213 } decf89f86ecd3c Nick Kossifidis 2021-11-26 1214 } e53d28180d4d0f Nick Kossifidis 2021-04-19 1215 e53d28180d4d0f Nick Kossifidis 2021-04-19 1216 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", e53d28180d4d0f Nick Kossifidis 2021-04-19 1217 crash_base, crash_base + crash_size, crash_size >> 20); e53d28180d4d0f Nick Kossifidis 2021-04-19 1218 e53d28180d4d0f Nick Kossifidis 2021-04-19 1219 crashk_res.start = crash_base; e53d28180d4d0f Nick Kossifidis 2021-04-19 1220 crashk_res.end = crash_base + crash_size - 1; e53d28180d4d0f Nick Kossifidis 2021-04-19 1221 } e53d28180d4d0f Nick Kossifidis 2021-04-19 1222 :::::: The code at line 1204 was first introduced by commit :::::: decf89f86ecd3c3c3de81c562010d5797bea3de1 riscv: try to allocate crashkern region from 32bit addressible memory :::::: TO: Nick Kossifidis :::::: CC: Palmer Dabbelt -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki