tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: b4bb878f3eb3e604ebfe83bbc17eb7af8d99cbf4 commit: ec0d0eb347b05377ad2e03c51cb1d08d6ed35619 [2106/4407] f2fs: compress: deny setting unsupported compress algorithm config: mips-randconfig-r033-20210119 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 22b68440e1647e16b5ee24b924986207173c02d1) 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/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout ec0d0eb347b05377ad2e03c51cb1d08d6ed35619 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static int f2fs_compress_set_level(struct f2fs_sb_info const char ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/bitops.h", .line = 105, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 or $0, $2 sc $0, $1 beqz $0, 1b .set pop ' clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 12.0.0 (git://gitmirror/llvm_project 22b68440e1647e16b5ee24b924986207173c02d1) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-22b68440e1/bin clang-12: note: diagnostic msg: Makefile arch fs include kernel scripts source usr vim +/f2fs_compress_set_level +470 fs/f2fs/super.c ed318a6cc0b62044 Eric Biggers 2020-05-12 468 0ba061b9e957791e Chao Yu 2020-12-09 469 #ifdef CONFIG_F2FS_FS_COMPRESSION 0ba061b9e957791e Chao Yu 2020-12-09 @470 static int f2fs_compress_set_level(struct f2fs_sb_info *sbi, const char *str, 0ba061b9e957791e Chao Yu 2020-12-09 471 int type) 0ba061b9e957791e Chao Yu 2020-12-09 472 { 0ba061b9e957791e Chao Yu 2020-12-09 473 unsigned int level; 0ba061b9e957791e Chao Yu 2020-12-09 474 int len; 0ba061b9e957791e Chao Yu 2020-12-09 475 0ba061b9e957791e Chao Yu 2020-12-09 476 if (type == COMPRESS_LZ4) 0ba061b9e957791e Chao Yu 2020-12-09 477 len = 3; 0ba061b9e957791e Chao Yu 2020-12-09 478 else if (type == COMPRESS_ZSTD) 0ba061b9e957791e Chao Yu 2020-12-09 479 len = 4; 0ba061b9e957791e Chao Yu 2020-12-09 480 else 0ba061b9e957791e Chao Yu 2020-12-09 481 return 0; 0ba061b9e957791e Chao Yu 2020-12-09 482 0ba061b9e957791e Chao Yu 2020-12-09 483 if (strlen(str) == len) 0ba061b9e957791e Chao Yu 2020-12-09 484 return 0; 0ba061b9e957791e Chao Yu 2020-12-09 485 0ba061b9e957791e Chao Yu 2020-12-09 486 str += len; 0ba061b9e957791e Chao Yu 2020-12-09 487 0ba061b9e957791e Chao Yu 2020-12-09 488 if (str[0] != ':') { 0ba061b9e957791e Chao Yu 2020-12-09 489 f2fs_info(sbi, "wrong format, e.g. <alg_name>:<compr_level>"); 0ba061b9e957791e Chao Yu 2020-12-09 490 return -EINVAL; 0ba061b9e957791e Chao Yu 2020-12-09 491 } 0ba061b9e957791e Chao Yu 2020-12-09 492 if (kstrtouint(str + 1, 10, &level)) 0ba061b9e957791e Chao Yu 2020-12-09 493 return -EINVAL; 0ba061b9e957791e Chao Yu 2020-12-09 494 if (type == COMPRESS_LZ4) { 0ba061b9e957791e Chao Yu 2020-12-09 495 #ifdef CONFIG_F2FS_FS_LZ4HC 0ba061b9e957791e Chao Yu 2020-12-09 496 if (level < LZ4HC_MIN_CLEVEL || level > LZ4HC_MAX_CLEVEL) { 0ba061b9e957791e Chao Yu 2020-12-09 497 f2fs_info(sbi, "invalid lz4hc compress level: %d", level); 0ba061b9e957791e Chao Yu 2020-12-09 498 return -EINVAL; 0ba061b9e957791e Chao Yu 2020-12-09 499 } 0ba061b9e957791e Chao Yu 2020-12-09 500 #else 0ba061b9e957791e Chao Yu 2020-12-09 501 f2fs_info(sbi, "doesn't support lz4hc compression"); 0ba061b9e957791e Chao Yu 2020-12-09 502 return 0; 0ba061b9e957791e Chao Yu 2020-12-09 503 #endif 0ba061b9e957791e Chao Yu 2020-12-09 504 } else if (type == COMPRESS_ZSTD) { 0ba061b9e957791e Chao Yu 2020-12-09 505 #ifdef CONFIG_F2FS_FS_ZSTD 0ba061b9e957791e Chao Yu 2020-12-09 506 if (!level || level > ZSTD_maxCLevel()) { 0ba061b9e957791e Chao Yu 2020-12-09 507 f2fs_info(sbi, "invalid zstd compress level: %d", level); 0ba061b9e957791e Chao Yu 2020-12-09 508 return -EINVAL; 0ba061b9e957791e Chao Yu 2020-12-09 509 } 0ba061b9e957791e Chao Yu 2020-12-09 510 #else 0ba061b9e957791e Chao Yu 2020-12-09 511 f2fs_info(sbi, "doesn't support zstd compression"); 0ba061b9e957791e Chao Yu 2020-12-09 512 #endif 0ba061b9e957791e Chao Yu 2020-12-09 513 } 0ba061b9e957791e Chao Yu 2020-12-09 514 F2FS_OPTION(sbi).compress_level = level; 0ba061b9e957791e Chao Yu 2020-12-09 515 return 0; 0ba061b9e957791e Chao Yu 2020-12-09 516 } 0ba061b9e957791e Chao Yu 2020-12-09 517 #endif 0ba061b9e957791e Chao Yu 2020-12-09 518 :::::: The code at line 470 was first introduced by commit :::::: 0ba061b9e957791e8120b6acb589a26fa7bbbb53 f2fs: compress: support compress level :::::: TO: Chao Yu <yuchao0(a)huawei.com&gt; :::::: CC: Jaegeuk Kim <jaegeuk(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org