[kbuild-all] include/linux/smp.h:34:33: error: requested alignment '20' is not a positive power of 2

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: b81b1829e7e39f6cebdf6e4d5484eacbceda8554 commit: 5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e parisc: Fix compile failure when building 64-bit kernel natively date: 6 months ago config: parisc-randconfig-r004-20220213 (https://download.01.org/0day-ci/archive/20220213/202202131741.c6BPpfzd-lk...) compiler: hppa64-linux-gcc (GCC) 11.2.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc prepare If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from arch/parisc/include/asm/bitops.h:203, from include/linux/bitops.h:32, from include/linux/kernel.h:12, from arch/parisc/include/asm/bug.h:5, from include/linux/bug.h:5, from include/linux/page-flags.h:10, from kernel/bounds.c:10: include/asm-generic/bitops/__fls.h: In function '__fls': 18 | if (!(word & (~0ul << 32))) { | ^~ include/asm-generic/bitops/__fls.h:20:22: warning: left shift count >= width of type [-Wshift-count-overflow] 20 | word <<= 32; | ^~~ include/asm-generic/bitops/__fls.h:23:28: warning: left shift count >= width of type [-Wshift-count-overflow] 23 | if (!(word & (~0ul << (BITS_PER_LONG-16)))) { | ^~ include/asm-generic/bitops/__fls.h:27:28: warning: left shift count >= width of type [-Wshift-count-overflow] 27 | if (!(word & (~0ul << (BITS_PER_LONG-8)))) { | ^~ include/asm-generic/bitops/__fls.h:31:28: warning: left shift count >= width of type [-Wshift-count-overflow] 31 | if (!(word & (~0ul << (BITS_PER_LONG-4)))) { | ^~ include/asm-generic/bitops/__fls.h:35:28: warning: left shift count >= width of type [-Wshift-count-overflow] 35 | if (!(word & (~0ul << (BITS_PER_LONG-2)))) { | ^~ include/asm-generic/bitops/__fls.h:39:28: warning: left shift count >= width of type [-Wshift-count-overflow] 39 | if (!(word & (~0ul << (BITS_PER_LONG-1)))) | ^~ In file included from arch/parisc/include/asm/bitops.h:203, from include/linux/bitops.h:32, from include/linux/kernel.h:12, from arch/parisc/include/asm/bug.h:5, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/parisc/include/generated/asm/current.h:1, from include/linux/sched.h:12, from arch/parisc/kernel/asm-offsets.c:18: include/asm-generic/bitops/__fls.h: In function '__fls': 18 | if (!(word & (~0ul << 32))) { | ^~ include/asm-generic/bitops/__fls.h:20:22: warning: left shift count >= width of type [-Wshift-count-overflow] 20 | word <<= 32; | ^~~ include/asm-generic/bitops/__fls.h:23:28: warning: left shift count >= width of type [-Wshift-count-overflow] 23 | if (!(word & (~0ul << (BITS_PER_LONG-16)))) { | ^~ include/asm-generic/bitops/__fls.h:27:28: warning: left shift count >= width of type [-Wshift-count-overflow] 27 | if (!(word & (~0ul << (BITS_PER_LONG-8)))) { | ^~ include/asm-generic/bitops/__fls.h:31:28: warning: left shift count >= width of type [-Wshift-count-overflow] 31 | if (!(word & (~0ul << (BITS_PER_LONG-4)))) { | ^~ include/asm-generic/bitops/__fls.h:35:28: warning: left shift count >= width of type [-Wshift-count-overflow] 35 | if (!(word & (~0ul << (BITS_PER_LONG-2)))) { | ^~ include/asm-generic/bitops/__fls.h:39:28: warning: left shift count >= width of type [-Wshift-count-overflow] 39 | if (!(word & (~0ul << (BITS_PER_LONG-1)))) | ^~ In file included from arch/parisc/include/asm/processor.h:17, from arch/parisc/include/asm/thread_info.h:8, from include/linux/thread_info.h:60, from include/asm-generic/current.h:5, from ./arch/parisc/include/generated/asm/current.h:1, from include/linux/sched.h:12, from arch/parisc/kernel/asm-offsets.c:18: arch/parisc/include/asm/pdc.h: At top level: 75 | struct pdc_memory_table *tbl, unsigned long entries); | ^~~~~~~~~~~~~~~~ 74 | int pdc_mem_mem_table(struct pdc_memory_table_raddr *r_addr, | ^~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/compiler_types.h:65, from <command-line>: 34 | __aligned(sizeof(struct __call_single_data)); | ^~~~~~~~~~~~~~~~~~ include/linux/compiler_attributes.h:53:68: note: in definition of macro '__aligned' 53 | #define __aligned(x) __attribute__((__aligned__(x))) | ^ In file included from include/linux/mm.h:33, from include/linux/pid_namespace.h:7, from include/linux/ptrace.h:10, from arch/parisc/kernel/asm-offsets.c:20: include/linux/pgtable.h: In function 'pud_index': 77 | return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); | ^~ include/linux/pgtable.h: In function 'pgd_offset_pgd': include/linux/pgtable.h:84:29: warning: right shift count >= width of type [-Wshift-count-overflow] 84 | #define pgd_index(a) (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | ^~ include/linux/pgtable.h:124:23: note: in expansion of macro 'pgd_index' 124 | return (pgd + pgd_index(address)); | ^~~~~~~~~ In file included from include/linux/stringhash.h:7, from include/linux/dcache.h:15, from include/linux/fs.h:8, from include/linux/huge_mm.h:8, from include/linux/mm.h:728, from include/linux/pid_namespace.h:7, from include/linux/ptrace.h:10, from arch/parisc/kernel/asm-offsets.c:20: include/linux/hash.h: In function 'hash32_ptr': 99 | val ^= (val >> 32); | ^~ In file included from arch/parisc/kernel/asm-offsets.c:22: arch/parisc/kernel/asm-offsets.c: In function 'main': 271 | DEFINE(ASM_PGD_ENTRY, PAGE_OFFSET >> PGDIR_SHIFT); | ^~ include/linux/kbuild.h:6:69: note: in definition of macro 'DEFINE' 6 | asm volatile("\n.ascii \"->" #sym " %0 " #val "\"" : : "i" (val)) | ^~~ make[2]: *** [scripts/Makefile.build:117: arch/parisc/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1217: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:220: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +/20 +34 include/linux/smp.h 3d4422332711ef Jens Axboe 2008-06-26 28 545b8c8df41f9e Peter Zijlstra 2020-06-15 29 #define CSD_INIT(_func, _info) \ 545b8c8df41f9e Peter Zijlstra 2020-06-15 30 (struct __call_single_data){ .func = (_func), .info = (_info), } 545b8c8df41f9e Peter Zijlstra 2020-06-15 31 966a967116e699 Ying Huang 2017-08-08 32 /* Use __aligned() to avoid to use 2 cache lines for 1 csd */ 966a967116e699 Ying Huang 2017-08-08 33 typedef struct __call_single_data call_single_data_t 966a967116e699 Ying Huang 2017-08-08 @34 __aligned(sizeof(struct __call_single_data)); 966a967116e699 Ying Huang 2017-08-08 35 :::::: The code at line 34 was first introduced by commit :::::: 966a967116e699762dbf4af7f9e0d1955c25aa37 smp: Avoid using two cache lines for struct call_single_data :::::: TO: Ying Huang <ying.huang(a)intel.com&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org