Re: [PATCH -v3 0/15] x86: Remove support for TSC-less and CX8-less CPUs

[Ahmed S. Darwish]

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