x86/x2apic: Add proper state tracking

Having 3 different variables to track the state is just silly and
error prone. Add a proper state tracking variable which covers the
three possible states: ON/OFF/DISABLED.

We cannot use x2apic_mode for this as this would require to change all
users of x2apic_mode with explicit comparisons for a state value
instead of treating it as boolean.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/20150115211702.955392443@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 14 insertions, 1 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 06b75216d171..b374b0de342b 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1480,6 +1480,14 @@ static bool nox2apic __initdata;
 #ifdef CONFIG_X86_X2APIC
 int x2apic_mode;
 static int x2apic_disabled;
+
+enum {
+        X2APIC_OFF,
+        X2APIC_ON,
+        X2APIC_DISABLED,
+};
+static int x2apic_state;
+
 static int __init setup_nox2apic(char *str)
 {
         if (x2apic_enabled()) {
@@ -1496,7 +1504,7 @@ static int __init setup_nox2apic(char *str)
                 setup_clear_cpu_cap(X86_FEATURE_X2APIC);
 
         nox2apic = true;
-
+        x2apic_state = X2APIC_DISABLED;
         return 0;
 }
 early_param("nox2apic", setup_nox2apic);
@@ -1539,6 +1547,7 @@ static __init void disable_x2apic(void)
         }
 
         x2apic_disabled = 1;
+        x2apic_state = X2APIC_DISABLED;
 }
 
 void enable_x2apic(void)
@@ -1559,6 +1568,7 @@ void enable_x2apic(void)
                 printk_once(KERN_INFO "Enabling x2apic\n");
                 wrmsrl(MSR_IA32_APICBASE, msr | X2APIC_ENABLE);
         }
+        x2apic_state = X2APIC_ON;
 }
 
 static __init void try_to_enable_x2apic(int remap_mode)
@@ -1597,6 +1607,9 @@ void __init check_x2apic(void)
         if (x2apic_enabled()) {
                 pr_info("x2apic: enabled by BIOS, switching to x2apic ops\n");
                 x2apic_mode = 1;
+                x2apic_state = X2APIC_ON;
+        } else if (!cpu_has_x2apic) {
+                x2apic_state = X2APIC_DISABLED;
         }
 }
 #else /* CONFIG_X86_X2APIC */