kernel: Add set_clac and clear_ac() definitions on non-x86 platforms.

headers/private/kernel/arch/arm/arch_cpu.h

@@ -11,6 +11,10 @@
 	// TODO: Could be 32-bits sometimes?
 
 
+#define set_ac()
+#define clear_ac()
+
+
 #ifndef _ASSEMBLER
 
 #include <arch/arm/arch_thread_types.h>

headers/private/kernel/arch/m68k/arch_cpu.h

@@ -18,6 +18,10 @@
 #define CACHE_LINE_SIZE		16
 
 
+#define set_ac()
+#define clear_ac()
+
+
 #define SR_IP_MASK 0x0700
 #define SR_S 0x2000
 #define M68K_SR_S 13

headers/private/kernel/arch/ppc/arch_cpu.h

@@ -16,6 +16,10 @@
 	// 128 Byte lines on PPC970
 
 
+#define set_ac()
+#define clear_ac()
+
+
 struct iframe {
 	uint32 vector;
 	uint32 srr0;