linux-kernel - Re: [PATCH -tip 2/4] x86/idle: Use MONITOR and MWAIT mnemonics in <asm/mwait.h>

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Message-ID: <Z-6pDGR0pQavVQfq@black.fi.intel.com>
Date: Thu, 3 Apr 2025 18:28:12 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Uros Bizjak <ubizjak@...il.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH -tip 2/4] x86/idle: Use MONITOR and MWAIT mnemonics in
 <asm/mwait.h>

On Wed, Apr 02, 2025 at 08:08:06PM +0200, Uros Bizjak wrote:
> Current minimum required version of binutils is 2.25,
> which supports MONITOR and MWAIT instruction mnemonics.
> 
> Replace the byte-wise specification of MONITOR and
> MWAIT with these proper mnemonics.
> 
> No functional change intended.

Hmm... Is it only me who gets these, please?

In file included from acpi/cstate.c:18:
asm/mwait.h:30:15: error: invalid operand for instruction
   30 |         asm volatile("monitor %0, %1, %2" :: "a" (eax), "c" (ecx), "d" (edx));
      |                      ^
<inline asm>:1:16: note: instantiated into assembly here
    1 |         monitor %rax, %ecx, %edx
      |                       ^~~~~
In file included from acpi/cstate.c:18:
asm/mwait.h:95:15: error: instruction requires: Not 64-bit mode
   95 |         asm volatile("sti; mwait %0, %1" :: "a" (eax), "c" (ecx));
      |                      ^
<inline asm>:1:7: note: instantiated into assembly here
    1 |         sti; mwait %eax, %ecx
      |              ^

-- 
With Best Regards,
Andy Shevchenko