1 files changed, 7 insertions, 36 deletions

diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 9a06df6cdd68..87bc9e7ca5d6 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -18,9 +18,14 @@
 
 #include "local.h"
 
-static int default_phys_pkg_id(int cpuid_apic, int index_msb)
+static u32 default_get_apic_id(u32 x)
 {
-	return cpuid_apic >> index_msb;
+	unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
+
+	if (APIC_XAPIC(ver) || boot_cpu_has(X86_FEATURE_EXTD_APICID))
+		return (x >> 24) & 0xFF;
+	else
+		return (x >> 24) & 0x0F;
 }
 
 /* should be called last. */
@@ -33,18 +38,13 @@ static struct apic apic_default __ro_after_init = {
 
 	.name				= "default",
 	.probe				= probe_default,
-	.apic_id_registered		= default_apic_id_registered,
 
-	.delivery_mode			= APIC_DELIVERY_MODE_FIXED,
 	.dest_mode_logical		= true,
 
 	.disable_esr			= 0,
 
-	.check_apicid_used		= default_check_apicid_used,
 	.init_apic_ldr			= default_init_apic_ldr,
-	.ioapic_phys_id_map		= default_ioapic_phys_id_map,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
-	.phys_pkg_id			= default_phys_pkg_id,
 
 	.max_apic_id			= 0xFE,
 	.get_apic_id			= default_get_apic_id,
@@ -93,35 +93,6 @@ static int __init parse_apic(char *arg)
 }
 early_param("apic", parse_apic);
 
-void __init x86_32_probe_bigsmp_early(void)
-{
-	if (nr_cpu_ids <= 8 || xen_pv_domain())
-		return;
-
-	if (IS_ENABLED(CONFIG_X86_BIGSMP)) {
-		switch (boot_cpu_data.x86_vendor) {
-		case X86_VENDOR_INTEL:
-			if (!APIC_XAPIC(boot_cpu_apic_version))
-				break;
-			/* P4 and above */
-			fallthrough;
-		case X86_VENDOR_HYGON:
-		case X86_VENDOR_AMD:
-			if (apic_bigsmp_possible(cmdline_apic))
-				return;
-			break;
-		}
-	}
-	pr_info("Limiting to 8 possible CPUs\n");
-	set_nr_cpu_ids(8);
-}
-
-void __init x86_32_install_bigsmp(void)
-{
-	if (nr_cpu_ids > 8 && !xen_pv_domain())
-		apic_bigsmp_force();
-}
-
 void __init x86_32_probe_apic(void)
 {
 	if (!cmdline_apic) {