Merge tag 'x86-cleanups-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull miscellaneous x86 cleanups from Thomas Gleixner:

- Correct the common copy and pasted mishandling of kstrtobool() in the
strict_sas_size() setup function

- Make recalibrate_cpu_khz() an GPL only export

- Check TSC feature before doing anything else which avoids pointless
code execution if TSC is not available

- Remove or fixup stale and misleading comments

- Remove unused or pointelessly duplicated variables

- Spelling and typo fixes

* tag 'x86-cleanups-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/hotplug: Remove incorrect comment about mwait_play_dead()
x86/tsc: Do feature check as the very first thing
x86/tsc: Make recalibrate_cpu_khz() export GPL only
x86/cacheinfo: Remove unused trace variable
x86/Kconfig: Fix spellos & punctuation
x86/signal: Fix the value returned by strict_sas_size()
x86/cpu: Remove misleading comment
x86/setup: Move duplicate boot_cpu_data definition out of the ifdeffery
x86/boot/e820: Fix typo in e820.c comment

arch/x86/Kconfig

···
 	depends on X86_64
 	help
 	  5-level paging enables access to larger address space:
-	  upto 128 PiB of virtual address space and 4 PiB of
+	  up to 128 PiB of virtual address space and 4 PiB of
 	  physical address space.
 
 	  It will be supported by future Intel CPUs.
···
 	  a noisy dmesg about callthunks generation and call patching for
 	  trouble shooting. The debug prints need to be enabled on the
 	  kernel command line with 'debug-callthunks'.
-	  Only enable this, when you are debugging call thunks as this
-	  creates a noticable runtime overhead. If unsure say N.
+	  Only enable this when you are debugging call thunks as this
+	  creates a noticeable runtime overhead. If unsure say N.
 
 config CPU_IBPB_ENTRY
 	bool "Enable IBPB on kernel entry"

arch/x86/kernel/cpu/cacheinfo.c

···
 void init_intel_cacheinfo(struct cpuinfo_x86 *c)
 {
 	/* Cache sizes */
-	unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0;
+	unsigned int l1i = 0, l1d = 0, l2 = 0, l3 = 0;
 	unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
 	unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
 	unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
···
 							break;
 						case LVL_3:
 							l3 += cache_table[k].size;
-							break;
-						case LVL_TRACE:
-							trace += cache_table[k].size;
 							break;
 						}
 

arch/x86/kernel/cpu/common.c

···
 	return 1;
 }
 __setup("nopku", setup_disable_pku);
-#endif /* CONFIG_X86_64 */
+#endif
 
 #ifdef CONFIG_X86_KERNEL_IBT
 

arch/x86/kernel/e820.c

···
  *
  * Once the E820 map has been converted to the standard Linux memory layout
  * information its role stops - modifying it has no effect and does not get
- * re-propagated. So itsmain role is a temporary bootstrap storage of firmware
+ * re-propagated. So its main role is a temporary bootstrap storage of firmware
  * specific memory layout data during early bootup.
  */
 static struct e820_table e820_table_init		__initdata;
···
 
 		/* Continue building up new map based on this information: */
 		if (current_type != last_type || e820_nomerge(current_type)) {
-			if (last_type != 0)	 {
+			if (last_type) {
 				new_entries[new_nr_entries].size = change_point[chg_idx]->addr - last_addr;
 				/* Move forward only if the new size was non-zero: */
 				if (new_entries[new_nr_entries].size != 0)
···
 					if (++new_nr_entries >= max_nr_entries)
 						break;
 			}
-			if (current_type != 0)	{
+			if (current_type) {
 				new_entries[new_nr_entries].addr = change_point[chg_idx]->addr;
 				new_entries[new_nr_entries].type = current_type;
 				last_addr = change_point[chg_idx]->addr;

arch/x86/kernel/setup.c

···
 #ifdef CONFIG_X86_32
 /* CPU data as detected by the assembly code in head_32.S */
 struct cpuinfo_x86 new_cpu_data;
-
-/* Common CPU data for all CPUs */
-struct cpuinfo_x86 boot_cpu_data __read_mostly;
-EXPORT_SYMBOL(boot_cpu_data);
-
 unsigned int def_to_bigsmp;
 
 struct apm_info apm_info;
···
 struct ist_info ist_info;
 #endif
 
-#else
-struct cpuinfo_x86 boot_cpu_data __read_mostly;
-EXPORT_SYMBOL(boot_cpu_data);
 #endif
 
+struct cpuinfo_x86 boot_cpu_data __read_mostly;
+EXPORT_SYMBOL(boot_cpu_data);
 
 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
 __visible unsigned long mmu_cr4_features __ro_after_init;

arch/x86/kernel/signal.c

···
 
 static int __init strict_sas_size(char *arg)
 {
-	return kstrtobool(arg, &strict_sigaltstack_size);
+	return kstrtobool(arg, &strict_sigaltstack_size) == 0;
 }
 __setup("strict_sas_size", strict_sas_size);
 

arch/x86/kernel/smpboot.c

···
 	play_dead_common();
 	tboot_shutdown(TB_SHUTDOWN_WFS);
 
-	mwait_play_dead();	/* Only returns on failure */
+	mwait_play_dead();
 	if (cpuidle_play_dead())
 		hlt_play_dead();
 }

arch/x86/kernel/tsc.c

···
 						    cpu_khz_old, cpu_khz);
 #endif
 }
-
-EXPORT_SYMBOL(recalibrate_cpu_khz);
+EXPORT_SYMBOL_GPL(recalibrate_cpu_khz);
 
 
 static unsigned long long cyc2ns_suspend;
···
 
 void __init tsc_init(void)
 {
+	if (!cpu_feature_enabled(X86_FEATURE_TSC)) {
+		setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
+		return;
+	}
+
 	/*
 	 * native_calibrate_cpu_early can only calibrate using methods that are
 	 * available early in boot.
 	 */
 	if (x86_platform.calibrate_cpu == native_calibrate_cpu_early)
 		x86_platform.calibrate_cpu = native_calibrate_cpu;
-
-	if (!boot_cpu_has(X86_FEATURE_TSC)) {
-		setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
-		return;
-	}
 
 	if (!tsc_khz) {
 		/* We failed to determine frequencies earlier, try again */