linux-kernel - Re: [PATCH -tip] x86/idle: Work around LLVM assembler bug with MONITOR and MWAIT insn

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Message-ID: <CAFULd4axo8ZOVJwRkqhi0nFYAveX6mBpd0Bwte+rYp=umHTP8Q@mail.gmail.com>
Date: Thu, 3 Apr 2025 11:27:02 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, 
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH -tip] x86/idle: Work around LLVM assembler bug with
 MONITOR and MWAIT insn

On Thu, Apr 3, 2025 at 11:22 AM Borislav Petkov <bp@...en8.de> wrote:
>
> On Thu, Apr 03, 2025 at 11:06:02AM +0200, Uros Bizjak wrote:
> > The least common denominator is an insn with implicit operands. I'll
> > post V2 that fixes it that way.
>
> I guess.
>
> You don't need to post a patch ontop - your previous one should be removed and
> the whole effort can start all over again.

IMO, in this case the fixup also documents the LLVM bug, so perhaps
the fixup on top is desirable for documentation purposes.

BTW: The test with CC=clang make argument didn't expose this issue.

Uros.