From: Naresh Kamboju <naresh.kamboju@linaro.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: clang-built-linux <clang-built-linux@googlegroups.com>,
llvm@lists.linux.dev, open list <linux-kernel@vger.kernel.org>,
X86 ML <x86@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: x86_64: clang-10: <instantiation>:2:2: error: unknown use of instruction mnemonic without a size suffix
Date: Mon, 20 Sep 2021 12:24:48 +0530 [thread overview]
Message-ID: <CA+G9fYv-EHy3-+ALV3Ev0k6J=e0_y7Xm2KgGFuE4XXFHp5EazA@mail.gmail.com> (raw)
In-Reply-To: <YUgDV31uzAQy5IcN@archlinux-ax161>
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 This cannot be fixed in the LLVM 10 branch as it is no longer updated so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
next prev parent reply other threads:[~2021-09-20 6:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-20 3:25 x86_64: clang-10: <instantiation>:2:2: error: unknown use of instruction mnemonic without a size suffix Naresh Kamboju
2021-09-20 3:25 ` Naresh Kamboju
2021-09-20 3:43 ` Nathan Chancellor
2021-09-20 6:54 ` Naresh Kamboju [this message]
2021-09-20 6:54 ` Naresh Kamboju
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