Messages in this thread | | | From | Naresh Kamboju <> | Date | Mon, 20 Sep 2021 12:24:48 +0530 | Subject | Re: x86_64: clang-10: <instantiation>:2:2: error: unknown use of instruction mnemonic without a size suffix |
| |
Hi Nathan,
On Mon, 20 Sept 2021 at 09:13, Nathan Chancellor <nathan@kernel.org> wrote: > > Hi Naresh, > > On Mon, Sep 20, 2021 at 08:55:46AM +0530, Naresh Kamboju wrote: > > [Please ignore this email if it is already reported ] > > > > Following build warnings/ errors noticed while building linux mainline > > master branch > > with clang-10 for x86_64 architecture. > > But clang-11, clang-12 and clang-13 build pass. > > > > <instantiation>:2:2: error: unknown use of instruction mnemonic > > without a size suffix > > lsl %rax, %rax > > ^ > > <instantiation>:1:1: note: while in macro instantiation > > LOAD_CPU_AND_NODE_SEG_LIMIT %rax > > ^ > > <instantiation>:2:2: note: while in macro instantiation > > GET_PERCPU_BASE %rax > > ^ > > /builds/linux/arch/x86/entry/entry_64.S:887:2: note: while in macro > > instantiation > > SAVE_AND_SET_GSBASE scratch_reg=%rax save_reg=%rbx > > ^ > > make[3]: *** [/builds/linux/scripts/Makefile.build:379:
> Thanks for the report. This is another case where the implicit switch to > the integrated assembler exposed a previously fixed issue in LLVM: > > https://github.com/ClangBuiltLinux/linux/issues/1079 > > This cannot be fixed in the LLVM 10 branch as it is no longer updated so > if you want to keep testing with clang-10 for x86_64 on mainline, please > add 'LLVM_IAS=0' to your make command like we did in our own CI.
We will update our gitlab pipeline CI configs with 'LLVM_IAS=0'.
> > As a quick aside, would you mind updating my email address in your > system for reports to nathan@kernel.org? It will ensure it gets sent to > the correct inbox so that I do not miss things, as I do not use my > personal address for kernel development anymore.
Noted.
- Naresh
| |