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From: "Ahmed S. Darwish" <darwi@linutronix.de>
To: Brian Gerst <brgerst@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>,
	linux-kernel@vger.kernel.org,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@kernel.org>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H . Peter Anvin" <hpa@zytor.com>,
	John Ogness <john.ogness@linutronix.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH -v3 0/15] x86: Remove support for TSC-less and CX8-less CPUs
Date: Mon, 15 Dec 2025 14:55:27 +0100	[thread overview]
Message-ID: <aUATT37rXDPXKYyH@lx-t490> (raw)
In-Reply-To: <CAMzpN2icJAGELPOv1-d_aomdtyB9+YPB7LDBY334wD+aiV7yMA@mail.gmail.com>

Hi,

On Sun, 14 Dec 2025, Brian Gerst wrote:
>
> Does this also eliminate all processors that do not support CPUID?
>

If it does, then we can also remove X86_FEATURE_CPUID from word 3:

--- linux.orig/arch/x86/include/asm/cpufeatures.h
+++ linux/arch/x86/include/asm/cpufeatures.h
@@ -94,3 +94,3 @@
 #define X86_FEATURE_NONSTOP_TSC	( 3*32+24) /* "nonstop_tsc" TSC does not stop in C states */
-#define X86_FEATURE_CPUID		( 3*32+25) /* "cpuid" CPU has CPUID instruction itself */
+/* Reserved				( 3*32+25) */
 #define X86_FEATURE_EXTD_APICID	( 3*32+26) /* "extd_apicid" Extended APICID (8 bits) */

plus its call sites.

Thanks,
Ahmed

  parent reply	other threads:[~2025-12-15 13:55 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-12-14  8:46 [PATCH -v3 0/15] x86: Remove support for TSC-less and CX8-less CPUs Ingo Molnar
2025-12-14  8:46 ` [PATCH 01/15] x86/cpu: Remove M486/M486SX/ELAN support Ingo Molnar
2026-03-30  7:05   ` [tip: x86/platform] " tip-bot2 for Ingo Molnar
2026-03-30  9:45   ` tip-bot2 for Ingo Molnar
2025-12-14  8:46 ` [PATCH 02/15] x86/cpu: Remove CONFIG_MWINCHIP3D/MWINCHIPC6 Ingo Molnar
2025-12-14  8:46 ` [PATCH 03/15] x86/cpu: Remove CPU_SUP_UMC_32 support Ingo Molnar
2025-12-14  8:46 ` [PATCH 04/15] x86/cpu: Remove TSC-less CONFIG_M586 support Ingo Molnar
2025-12-14  8:46 ` [PATCH 05/15] x86/cpu, x86/platform, watchdog: Remove CONFIG_X86_RDC321X support Ingo Molnar
2025-12-14  8:46 ` [PATCH 06/15] x86/cpu: Remove the CONFIG_X86_INVD_BUG quirk Ingo Molnar
2025-12-14  8:46 ` [PATCH 07/15] x86/cpu, cpufreq: Remove AMD ELAN support Ingo Molnar
2025-12-14  8:46 ` [PATCH 08/15] x86/fpu: Remove MATH_EMULATION and related glue code Ingo Molnar
2025-12-14  8:46 ` [PATCH 09/15] x86/fpu: Remove the 'no387' boot option Ingo Molnar
2025-12-14  8:46 ` [PATCH 10/15] x86/fpu: Remove the math-emu/ FPU emulation library Ingo Molnar
2025-12-14  8:46 ` [PATCH 11/15] x86/cpu: Make CONFIG_X86_TSC unconditional Ingo Molnar
2025-12-14  8:47 ` [PATCH 12/15] x86: Remove !CONFIG_X86_TSC code Ingo Molnar
2025-12-14  8:47 ` [PATCH 13/15] x86/cpu: Make CONFIG_X86_CX8 unconditional Ingo Molnar
2025-12-14  8:47 ` [PATCH 14/15] x86/atomics: Remove !CONFIG_X86_CX8 methods Ingo Molnar
2025-12-14  8:47 ` [PATCH 15/15] x86/percpu: " Ingo Molnar
2025-12-14  9:38   ` Uros Bizjak
2025-12-15  7:05     ` [PATCH 15/15 -v4] " Ingo Molnar
2025-12-14 13:39 ` [PATCH -v3 0/15] x86: Remove support for TSC-less and CX8-less CPUs David Laight
2025-12-15  4:22   ` H. Peter Anvin
2025-12-15  2:39 ` Brian Gerst
2025-12-15  3:19   ` Linus Torvalds
2025-12-15 13:55   ` Ahmed S. Darwish [this message]
2026-01-04 13:08     ` Borislav Petkov
2026-01-07  3:57       ` H. Peter Anvin
2025-12-15 15:54 ` Arnd Bergmann
2026-01-03 22:59   ` Maciej W. Rozycki

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