x86: add set/clear_cpu_cap operations

The patch to suppress bitops-related warnings added a pile of ugly
casts.  Many of these were related to the management of x86 CPU
capabilities.  Clean these up by adding specific set/clear_cpu_cap
macros, and use them consistently.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 0270042..ab4ae50 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1211,7 +1211,7 @@
 static __init int setup_disableapic(char *str)
 {
 	disable_apic = 1;
-	clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
+	clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
 	return 0;
 }
 early_param("disableapic", setup_disableapic);