x86/apic: Make some APIC init functions bool

Quite some APIC init functions are pure boolean, but use the success = 0,
fail < 0 model. That's confusing as hell when reading through the code.

Convert them to boolean.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)

arch/x86/include/asm/apic.h

@@ -135,12 +135,12 @@ extern void setup_secondary_APIC_clock(void);
 extern void lapic_update_tsc_freq(void);
 
 #ifdef CONFIG_X86_64
-static inline int apic_force_enable(unsigned long addr)
+static inline bool apic_force_enable(unsigned long addr)
 {
-	return -1;
+	return false;
 }
 #else
-extern int apic_force_enable(unsigned long addr);
+extern bool apic_force_enable(unsigned long addr);
 #endif
 
 extern void apic_ap_setup(void);

arch/x86/kernel/apic/apic.c

@@ -2000,19 +2000,19 @@ void __init enable_IR_x2apic(void)
  * On AMD64 we trust the BIOS - if it says no APIC it is likely
  * not correctly set up (usually the APIC timer won't work etc.)
  */
-static int __init detect_init_APIC(void)
+static bool __init detect_init_APIC(void)
 {
 	if (!boot_cpu_has(X86_FEATURE_APIC)) {
 		pr_info("No local APIC present\n");
-		return -1;
+		return false;
 	}
 
 	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
-	return 0;
+	return true;
 }
 #else
 
-static int __init apic_verify(void)
+static bool __init apic_verify(void)
 {
 	u32 features, h, l;
 
@@ -2023,7 +2023,7 @@ static int __init apic_verify(void)
 	features = cpuid_edx(1);
 	if (!(features & (1 << X86_FEATURE_APIC))) {
 		pr_warn("Could not enable APIC!\n");
-		return -1;
+		return false;
 	}
 	set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
 	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
@@ -2036,15 +2036,15 @@ static int __init apic_verify(void)
 	}
 
 	pr_info("Found and enabled local APIC!\n");
-	return 0;
+	return true;
 }
 
-int __init apic_force_enable(unsigned long addr)
+bool __init apic_force_enable(unsigned long addr)
 {
 	u32 h, l;
 
 	if (apic_is_disabled)
-		return -1;
+		return false;
 
 	/*
 	 * Some BIOSes disable the local APIC in the APIC_BASE
@@ -2067,11 +2067,11 @@ int __init apic_force_enable(unsigned long addr)
 /*
  * Detect and initialize APIC
  */
-static int __init detect_init_APIC(void)
+static bool __init detect_init_APIC(void)
 {
 	/* Disabled by kernel option? */
 	if (apic_is_disabled)
-		return -1;
+		return false;
 
 	switch (boot_cpu_data.x86_vendor) {
 	case X86_VENDOR_AMD:
@@ -2098,22 +2098,22 @@ static int __init detect_init_APIC(void)
 		if (!force_enable_local_apic) {
 			pr_info("Local APIC disabled by BIOS -- "
 				"you can enable it with \"lapic\"\n");
-			return -1;
+			return false;
 		}
-		if (apic_force_enable(APIC_DEFAULT_PHYS_BASE))
-			return -1;
+		if (!apic_force_enable(APIC_DEFAULT_PHYS_BASE))
+			return false;
 	} else {
-		if (apic_verify())
-			return -1;
+		if (!apic_verify())
+			return false;
 	}
 
 	apic_pm_activate();
 
-	return 0;
+	return true;
 
 no_apic:
 	pr_info("No local APIC present or hardware disabled\n");
-	return -1;
+	return false;
 }
 #endif
 
@@ -2129,7 +2129,7 @@ void __init init_apic_mappings(void)
 		return;
 
 	/* If no local APIC can be found return early */
-	if (!smp_found_config && detect_init_APIC()) {
+	if (!smp_found_config && !detect_init_APIC()) {
 		/* lets NOP'ify apic operations */
 		pr_info("APIC: disable apic facility\n");
 		apic_disable();

arch/x86/kernel/devicetree.c

@@ -158,7 +158,7 @@ static void __init dtb_lapic_setup(void)
 	/* Did the boot loader setup the local APIC ? */
 	if (!boot_cpu_has(X86_FEATURE_APIC)) {
 		/* Try force enabling, which registers the APIC address */
-		if (apic_force_enable(lapic_addr))
+		if (!apic_force_enable(lapic_addr))
 			return;
 	} else {
 		register_lapic_address(lapic_addr);