Hi Thomas, First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8 commit: ba15533275dd70238b523417d222d43fb40dac9d Merge tag 'v5.6' into mips-next date: 11 months ago config: mips-randconfig-r011-20210301 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project b077d82b00d81934c7c27ac89dd8b0e7f448bded) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ba15533275dd70238b523417d222d43fb40dac9d git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout ba15533275dd70238b523417d222d43fb40dac9d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> All warnings (new ones prefixed by >>): In file included from drivers/firmware/dmi_scan.c:5: In file included from include/linux/module.h:16: In file included from include/linux/kmod.h:9: In file included from include/linux/umh.h:4: In file included from include/linux/gfp.h:9: include/linux/topology.h:119:9: error: implicit declaration of function 'cpu_logical_map' [-Werror,-Wimplicit-function-declaration] return cpu_to_node(raw_smp_processor_id()); ^ arch/mips/include/asm/mach-loongson64/topology.h:7:27: note: expanded from macro 'cpu_to_node' #define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2) ^ In file included from drivers/firmware/dmi_scan.c:5: In file included from include/linux/module.h:16: In file included from include/linux/kmod.h:9: In file included from include/linux/umh.h:4: In file included from include/linux/gfp.h:9: include/linux/topology.h:193:9: error: implicit declaration of function 'cpu_logical_map' [-Werror,-Wimplicit-function-declaration] return cpu_to_node(cpu); ^ arch/mips/include/asm/mach-loongson64/topology.h:7:27: note: expanded from macro 'cpu_to_node' #define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2) ^ In file included from drivers/firmware/dmi_scan.c:5: In file included from include/linux/module.h:16: In file included from include/linux/kmod.h:9: In file included from include/linux/umh.h:4: In file included from include/linux/gfp.h:9: include/linux/topology.h:227:25: error: implicit declaration of function 'cpu_logical_map' [-Werror,-Wimplicit-function-declaration] return cpumask_of_node(cpu_to_node(cpu)); ^ arch/mips/include/asm/mach-loongson64/topology.h:7:27: note: expanded from macro 'cpu_to_node' #define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2) ^ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:11:52: note: expanded from macro '__get_unaligned_le' #define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({ \ ^~~ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:12:33: note: expanded from macro '__get_unaligned_le' __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \ ^~~ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:12:47: note: expanded from macro '__get_unaligned_le' __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \ ^~~ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:13:33: note: expanded from macro '__get_unaligned_le' __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)), \ ^~~ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:14:33: note: expanded from macro '__get_unaligned_le' __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \ ^~~ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:14:65: note: expanded from macro '__get_unaligned_le' __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \ ^~~ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:15:33: note: expanded from macro '__get_unaligned_le' __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \ ^~~ >> drivers/firmware/dmi_scan.c:405:41: warning: taking address of packed member >> 'handle' of class or structure 'dmi_header' may result in an unaligned >> pointer value [-Waddress-of-packed-member] dmi_memdev[nr].handle = get_unaligned(&dm->handle); ^~~~~~~~~~ include/asm-generic/unaligned.h:22:24: note: expanded from macro 'get_unaligned' # define get_unaligned __get_unaligned_le ^ include/linux/unaligned/generic.h:15:65: note: expanded from macro '__get_unaligned_le' __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \ ^~~ 8 warnings and 3 errors generated. vim +405 drivers/firmware/dmi_scan.c dd6dad4288cb93 Chen, Gong 2013-10-18 391 dd6dad4288cb93 Chen, Gong 2013-10-18 392 static void __init save_mem_devices(const struct dmi_header *dm, void *v) dd6dad4288cb93 Chen, Gong 2013-10-18 393 { dd6dad4288cb93 Chen, Gong 2013-10-18 394 const char *d = (const char *)dm; dd6dad4288cb93 Chen, Gong 2013-10-18 395 static int nr; 6deae96b42eb1f Tony Luck 2018-03-12 396 u64 bytes; 6deae96b42eb1f Tony Luck 2018-03-12 397 u16 size; dd6dad4288cb93 Chen, Gong 2013-10-18 398 9e0afe3910ff7e Jean Delvare 2019-12-03 399 if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x13) dd6dad4288cb93 Chen, Gong 2013-10-18 400 return; dd6dad4288cb93 Chen, Gong 2013-10-18 401 if (nr >= dmi_memdev_nr) { dd6dad4288cb93 Chen, Gong 2013-10-18 402 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n"); dd6dad4288cb93 Chen, Gong 2013-10-18 403 return; dd6dad4288cb93 Chen, Gong 2013-10-18 404 } 0841c04d65937a Tony Luck 2013-11-01 @405 dmi_memdev[nr].handle = get_unaligned(&dm->handle); dd6dad4288cb93 Chen, Gong 2013-10-18 406 dmi_memdev[nr].device = dmi_string(dm, d[0x10]); dd6dad4288cb93 Chen, Gong 2013-10-18 407 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]); 9e0afe3910ff7e Jean Delvare 2019-12-03 408 dmi_memdev[nr].type = d[0x12]; 6deae96b42eb1f Tony Luck 2018-03-12 409 6deae96b42eb1f Tony Luck 2018-03-12 410 size = get_unaligned((u16 *)&d[0xC]); 6deae96b42eb1f Tony Luck 2018-03-12 411 if (size == 0) 6deae96b42eb1f Tony Luck 2018-03-12 412 bytes = 0; 6deae96b42eb1f Tony Luck 2018-03-12 413 else if (size == 0xffff) 6deae96b42eb1f Tony Luck 2018-03-12 414 bytes = ~0ull; 6deae96b42eb1f Tony Luck 2018-03-12 415 else if (size & 0x8000) 6deae96b42eb1f Tony Luck 2018-03-12 416 bytes = (u64)(size & 0x7fff) << 10; 81dde26de9c08b Jean Delvare 2019-10-14 417 else if (size != 0x7fff || dm->length < 0x20) 6deae96b42eb1f Tony Luck 2018-03-12 418 bytes = (u64)size << 20; 6deae96b42eb1f Tony Luck 2018-03-12 419 else 6deae96b42eb1f Tony Luck 2018-03-12 420 bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20; 6deae96b42eb1f Tony Luck 2018-03-12 421 6deae96b42eb1f Tony Luck 2018-03-12 422 dmi_memdev[nr].size = bytes; dd6dad4288cb93 Chen, Gong 2013-10-18 423 nr++; dd6dad4288cb93 Chen, Gong 2013-10-18 424 } dd6dad4288cb93 Chen, Gong 2013-10-18 425 :::::: The code at line 405 was first introduced by commit :::::: 0841c04d65937ad2808f59c43cb54a92473c8f0e dmi: Avoid unaligned memory access in save_mem_devices() :::::: TO: Luck, Tony <[email protected]> :::::: CC: Ingo Molnar <[email protected]> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
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