x86/cpufeatures: Free up unused feature bits

JIRA: https://issues.redhat.com/browse/RHEL-106912

commit 7a470e8
Author: Sohil Mehta <sohil.mehta@intel.com>
Date:   Thu Nov 7 23:30:00 2024 +0000

    x86/cpufeatures: Free up unused feature bits

    Linux defined feature bits X86_FEATURE_P3 and X86_FEATURE_P4 are not
    used anywhere. Commit f31d731 ("x86: use X86_FEATURE_NOPL in
    alternatives") got rid of the last usage in 2008. Remove the related
    mappings and code.

    Just like all X86_FEATURE bits, the raw bit numbers can be exposed to
    userspace via MODULE_DEVICE_TABLE(). There is a very small theoretical
    chance of userspace getting confused if these bits got reassigned and
    changed logical meaning.  But these bits were never used for a device
    table, so it's highly unlikely this will ever happen in practice.

    [ dhansen: clarify userspace visibility of these bits ]

    Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
    Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Link: https://lore.kernel.org/all/20241107233000.2742619-1-sohil.mehta%40intel.com

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

arch/x86/include/asm/cpufeatures.h

@@ -85,8 +85,8 @@
 #define X86_FEATURE_CENTAUR_MCR		( 3*32+ 3) /* "centaur_mcr" Centaur MCRs (= MTRRs) */
 #define X86_FEATURE_K8			( 3*32+ 4) /* Opteron, Athlon64 */
 #define X86_FEATURE_ZEN5		( 3*32+ 5) /* CPU based on Zen5 microarchitecture */
-#define X86_FEATURE_P3			( 3*32+ 6) /* P3 */
-#define X86_FEATURE_P4			( 3*32+ 7) /* P4 */
+/* Free                                 ( 3*32+ 6) */
+/* Free                                 ( 3*32+ 7) */
 #define X86_FEATURE_CONSTANT_TSC	( 3*32+ 8) /* "constant_tsc" TSC ticks at a constant rate */
 #define X86_FEATURE_UP			( 3*32+ 9) /* "up" SMP kernel running on UP */
 #define X86_FEATURE_ART			( 3*32+10) /* "art" Always running timer (ART) */

arch/x86/kernel/cpu/intel.c

@@ -675,11 +675,6 @@ static void init_intel(struct cpuinfo_x86 *c)
 		if (p)
 			strcpy(c->x86_model_id, p);
 	}
-
-	if (c->x86 == 15)
-		set_cpu_cap(c, X86_FEATURE_P4);
-	if (c->x86 == 6)
-		set_cpu_cap(c, X86_FEATURE_P3);
 #endif
 
 	/* Work around errata */