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Subjectfs/ext4/fast_commit.c:1753:27: warning: unused function 'tag2str'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: b65054597872ce3aefbc6a666385eabdf9e288da
commit: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 ext4: fast commit recovery path
date: 6 weeks ago
config: mips-randconfig-r023-20201201 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ac40a2d8f16b8a8c68fc811d67f647740e965cb8)
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=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2
# 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@intel.com>

All warnings (new ones prefixed by >>):

>> fs/ext4/fast_commit.c:1753:27: warning: unused function 'tag2str'
static inline const char tag)
^
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 = 133, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
1: ll $0, $1
and $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 ac40a2d8f16b8a8c68fc811d67f647740e965cb8)
Target: mips-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/cross/clang-ac40a2d8f1/bin
clang-12: note: diagnostic msg:
Makefile arch fs include kernel scripts source usr

vim +/tag2str +1753 fs/ext4/fast_commit.c

1752
> 1753 static inline const char *tag2str(u16 tag)
1754 {
1755 switch (tag) {
1756 case EXT4_FC_TAG_LINK:
1757 return "TAG_ADD_ENTRY";
1758 case EXT4_FC_TAG_UNLINK:
1759 return "TAG_DEL_ENTRY";
1760 case EXT4_FC_TAG_ADD_RANGE:
1761 return "TAG_ADD_RANGE";
1762 case EXT4_FC_TAG_CREAT:
1763 return "TAG_CREAT_DENTRY";
1764 case EXT4_FC_TAG_DEL_RANGE:
1765 return "TAG_DEL_RANGE";
1766 case EXT4_FC_TAG_INODE:
1767 return "TAG_INODE";
1768 case EXT4_FC_TAG_PAD:
1769 return "TAG_PAD";
1770 case EXT4_FC_TAG_TAIL:
1771 return "TAG_TAIL";
1772 case EXT4_FC_TAG_HEAD:
1773 return "TAG_HEAD";
1774 default:
1775 return "TAG_ERROR";
1776 }
1777 }
1778

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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