LLVM ERROR: Error parsing inline asm

[pcercuei]

A lot of "macro is already defined" errors, plus what seems to be a crash within LLD.

  CALL    scripts/atomic/check-atomics.sh
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  CHK     include/generated/autoksyms.h
  GEN     .version
  CHK     include/generated/compile.h
  UPD     include/generated/compile.h
  CC      init/version.o
  AR      init/built-in.a
  GEN     .tmp_initcalls.lds
  LTO     vmlinux.o
<inline asm>:166:1: error: macro 'parse_r' is already defined
.macro  parse_r var r
^
<inline asm>:268:1: error: macro 'mfhc0' is already defined
.macro  mfhc0 rt, rs, sel = 0
^
<inline asm>:274:1: error: macro 'mthc0' is already defined
.macro  mthc0 rt, rd, sel = 0
^
<inline asm>:280:1: error: macro 'mfgc0' is already defined
.macro  mfgc0 rt, rs, sel = 0
^
<inline asm>:286:1: error: macro 'dmfgc0' is already defined
.macro  dmfgc0 rt, rs, sel = 0
^

[...]

<inline asm>:217145:1: error: macro 'tlbgwi' is already defined
.macro  tlbgwi
^
<inline asm>:217149:1: error: macro 'tlbgwr' is already defined
.macro  tlbgwr
^
<inline asm>:217153:1: error: macro 'tlbginvf' is already defined
.macro  tlbginvf
^
LLVM ERROR: Error parsing inline asm

PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
Stack dump:
0.	Program arguments: ld.lld -m elf32ltsmip -mllvm -import-instr-limit=5 -r -o vmlinux.o -T .tmp_initcalls.lds --whole-archive arch/mips/kernel/head.o init/built-in.a usr/built-in.a arch/mips/built-in.a arch/mips/boot/dts/built-in.a kernel/built-in.a certs/built-in.a mm/built-in.a fs/built-in.a ipc/built-in.a security/built-in.a crypto/built-in.a block/built-in.a lib/built-in.a arch/mips/fw/lib/built-in.a arch/mips/lib/built-in.a arch/mips/math-emu/built-in.a lib/lib.a arch/mips/fw/lib/lib.a arch/mips/lib/lib.a arch/mips/math-emu/lib.a drivers/built-in.a sound/built-in.a net/built-in.a virt/built-in.a arch/mips/crypto/built-in.a arch/mips/power/built-in.a --no-whole-archive --start-group --end-group 
 #0 0x00007fe302d1af8f llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbd0f8f)
 #1 0x00007fe302d192f0 llvm::sys::RunSignalHandlers() (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbcf2f0)
 #2 0x00007fe302d1b465 (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbd1465)
 #3 0x00007fe30725c140 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14140)
 #4 0x00007fe301c95ce1 raise ./signal/../sysdeps/unix/sysv/linux/raise.c:51:1
 #5 0x00007fe301c7f537 abort ./stdlib/abort.c:81:7
 #6 0x00007fe302c6ad68 (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xb20d68)
 #7 0x00007fe302c6ab88 (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xb20b88)
 #8 0x00007fe3033e1fef (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0x1297fef)
 #9 0x00007fe3033d1849 llvm::AsmPrinter::doInitialization(llvm::Module&) (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0x1287849)
#10 0x00007fe302e2f661 llvm::FPPassManager::doInitialization(llvm::Module&) (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xce5661)
#11 0x00007fe302e2a4d1 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xce04d1)
#12 0x00007fe303d9b71c (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0x1c5171c)
#13 0x00007fe303d9857a llvm::lto::backend(llvm::lto::Config const&, std::function<std::unique_ptr<llvm::lto::NativeObjectStream, std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)>, unsigned int, std::unique_ptr<llvm::Module, std::default_delete<llvm::Module> >, llvm::ModuleSummaryIndex&) (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0x1c4e57a)
#14 0x00007fe303d91408 llvm::lto::LTO::runRegularLTO(std::function<std::unique_ptr<llvm::lto::NativeObjectStream, std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)>) (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0x1c47408)
#15 0x00007fe303d90c53 llvm::lto::LTO::run(std::function<std::unique_ptr<llvm::lto::NativeObjectStream, std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)>, std::function<std::function<std::unique_ptr<llvm::lto::NativeObjectStream, std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)> (unsigned int, llvm::StringRef)>) (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0x1c46c53)
#16 0x00000000005c29d8 lld::elf::BitcodeCompiler::compile() (/usr/lib/llvm-11/bin/lld+0x5c29d8)
#17 0x000000000055a286 void lld::elf::LinkerDriver::compileBitcodeFiles<llvm::object::ELFType<(llvm::support::endianness)1, false> >() (/usr/lib/llvm-11/bin/lld+0x55a286)
#18 0x000000000054f042 void lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)1, false> >(llvm::opt::InputArgList&) (/usr/lib/llvm-11/bin/lld+0x54f042)
#19 0x0000000000547465 lld::elf::LinkerDriver::main(llvm::ArrayRef<char const*>) (/usr/lib/llvm-11/bin/lld+0x547465)
#20 0x0000000000545666 lld::elf::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&, llvm::raw_ostream&) (/usr/lib/llvm-11/bin/lld+0x545666)
#21 0x00000000004ba3da main (/usr/lib/llvm-11/bin/lld+0x4ba3da)
#22 0x00007fe301c80d0a __libc_start_main ./csu/../csu/libc-start.c:308:16
#23 0x00000000004b9afa _start (/usr/lib/llvm-11/bin/lld+0x4b9afa)
Aborted
make: *** [Makefile:1199 : vmlinux] Error 134

[nickdesaulniers]

I'd guess that these macros are defined in a header that's missing proper header guards, so they get redefined when LTO joins all of the sources together.

[pcercuei]

These are defined in arch/mips/include/asm/mipsregs.h, which does have header guards.

[glebm]

Could this be caused by something similar to this? https://patchwork.kernel.org/project/linux-arm-kernel/patch/20190423232622.GA11776@beast/

[nickdesaulniers]

#763 is already tracking the assembler macro warning, so let's use this bug to track the LLVM ERROR: Error parsing inline asm.

[pcercuei]

@nickdesaulniers it is a different bug, though. Not a duplicate.

[pcercuei]

@nickdesaulniers I sent a patch to the MIPS maintainer, and Cc'd you.

[nickdesaulniers]

@pcercuei friendly reminder to send a v2.

[pcercuei]

The patch was merged upstream, so I guess it's time to close this bug report.

[nickdesaulniers]

reopening until this hits mainline.

[nickdesaulniers]

accepted: https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=67512a8cf5a730938fdb1e48de33edfef6015e03

[nathanchance]

Merged into mainline: https://git.kernel.org/linus/67512a8cf5a730938fdb1e48de33edfef6015e03