Hi Nathan, First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 65f0d2414b7079556fbbcc070b3d1c9f9587606d commit: afe956c577b2d5a3d9834e4424587c1ebcf90c4c kbuild: Enable -Wtautological-compare date: 9 months ago config: mips-randconfig-r026-20210114 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 68ff52ffead2ba25cca442778ab19286000daad7) 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=afe956c577b2d5a3d9834e4424587c1ebcf90c4c git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout afe956c577b2d5a3d9834e4424587c1ebcf90c4c # 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 <l...@intel.com> All warnings (new ones prefixed by >>): In file included from include/linux/llist.h:51: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS' return cmpxchg(&v->counter, o, n); \ ^ arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/llist.c:15: In file included from include/linux/llist.h:51: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS' return xchg(&v->counter, n); \ ^ arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/llist.c:15: In file included from include/linux/llist.h:51: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_OPS(atomic64, s64) ^ arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS' return cmpxchg(&v->counter, o, n); \ ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/llist.c:15: In file included from include/linux/llist.h:51: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS' return cmpxchg(&v->counter, o, n); \ ^ arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/llist.c:15: In file included from include/linux/llist.h:51: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS' return xchg(&v->counter, n); \ ^ arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/llist.c:15: In file included from include/linux/llist.h:51: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:258:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_SIP_OP(atomic, int, subu, ll, sc) ^ arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/llist.c:15: In file included from include/linux/llist.h:51: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:262:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd) ^ arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/llist.c:15: include/linux/llist.h:222:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] return xchg(&head->first, NULL); ^ arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ >> lib/llist.c:33:11: warning: converting the result of '<<' to a boolean >> always evaluates to true [-Wtautological-constant-compare] } while (cmpxchg(&head->first, first, new_first) != first); ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ >> lib/llist.c:33:11: warning: converting the result of '<<' to a boolean >> always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ lib/llist.c:63:11: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] entry = cmpxchg(&head->first, old_entry, next); ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ lib/llist.c:63:11: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ 13 warnings generated. Assembler messages: Fatal error: invalid -march= option: `mips64r2' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) -- In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_OPS(atomic, int) ^ arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS' return cmpxchg(&v->counter, o, n); \ ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS' return cmpxchg(&v->counter, o, n); \ ^ arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS' return xchg(&v->counter, n); \ ^ arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_OPS(atomic64, s64) ^ arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS' return cmpxchg(&v->counter, o, n); \ ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS' return cmpxchg(&v->counter, o, n); \ ^ arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS' return xchg(&v->counter, n); \ ^ arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:258:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_SIP_OP(atomic, int, subu, ll, sc) ^ arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from lib/errseq.c:4: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:262:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd) ^ arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ >> lib/errseq.c:94:9: warning: converting the result of '<<' to a boolean >> always evaluates to true [-Wtautological-constant-compare] cur = cmpxchg(eseq, old, new); ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ >> lib/errseq.c:94:9: warning: converting the result of '<<' to a boolean >> always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ lib/errseq.c:200:4: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] cmpxchg(eseq, old, new); ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ lib/errseq.c:200:4: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ 12 warnings generated. Assembler messages: Fatal error: invalid -march= option: `mips64r2' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) -- >> arch/mips/kernel/cmpxchg.c:44:12: warning: converting the result of '<<' to >> a boolean always evaluates to true [-Wtautological-constant-compare] load32 = cmpxchg(ptr32, old32, new32); ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ >> arch/mips/kernel/cmpxchg.c:44:12: warning: converting the result of '<<' to >> a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ arch/mips/kernel/cmpxchg.c:100:12: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] load32 = cmpxchg(ptr32, old32, new32); ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ arch/mips/kernel/cmpxchg.c:100:12: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ 4 warnings generated. Assembler messages: Fatal error: invalid -march= option: `mips64r2' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) vim +33 lib/llist.c f49f23abf3dd786d Huang Ying 2011-07-13 16 f49f23abf3dd786d Huang Ying 2011-07-13 17 f49f23abf3dd786d Huang Ying 2011-07-13 18 /** f49f23abf3dd786d Huang Ying 2011-07-13 19 * llist_add_batch - add several linked entries in batch f49f23abf3dd786d Huang Ying 2011-07-13 20 * @new_first: first entry in batch to be added f49f23abf3dd786d Huang Ying 2011-07-13 21 * @new_last: last entry in batch to be added f49f23abf3dd786d Huang Ying 2011-07-13 22 * @head: the head for your lock-less list 781f7fd916fc77a8 Huang Ying 2011-09-08 23 * 781f7fd916fc77a8 Huang Ying 2011-09-08 24 * Return whether list is empty before adding. f49f23abf3dd786d Huang Ying 2011-07-13 25 */ 781f7fd916fc77a8 Huang Ying 2011-09-08 26 bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last, f49f23abf3dd786d Huang Ying 2011-07-13 27 struct llist_head *head) f49f23abf3dd786d Huang Ying 2011-07-13 28 { fb4214db50b00558 Oleg Nesterov 2013-07-08 29 struct llist_node *first; f49f23abf3dd786d Huang Ying 2011-07-13 30 fb4214db50b00558 Oleg Nesterov 2013-07-08 31 do { 6aa7de059173a986 Mark Rutland 2017-10-23 32 new_last->next = first = READ_ONCE(head->first); fb4214db50b00558 Oleg Nesterov 2013-07-08 @33 } while (cmpxchg(&head->first, first, new_first) != first); 781f7fd916fc77a8 Huang Ying 2011-09-08 34 fb4214db50b00558 Oleg Nesterov 2013-07-08 35 return !first; f49f23abf3dd786d Huang Ying 2011-07-13 36 } f49f23abf3dd786d Huang Ying 2011-07-13 37 EXPORT_SYMBOL_GPL(llist_add_batch); f49f23abf3dd786d Huang Ying 2011-07-13 38 :::::: The code at line 33 was first introduced by commit :::::: fb4214db50b00558cc6e274c88b3f7325068e942 llist: fix/simplify llist_add() and llist_add_batch() :::::: TO: Oleg Nesterov <o...@redhat.com> :::::: CC: Al Viro <v...@zeniv.linux.org.uk> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
.config.gz
Description: application/gzip
