parisc: Reduce overhead of parisc_requires_coherency()

Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/processor.h

@@ -311,18 +311,17 @@ extern unsigned long get_wchan(struct task_struct *p);
 #define cpu_relax()	barrier()
 #define cpu_relax_lowlatency() cpu_relax()
 
-/* Used as a macro to identify the combined VIPT/PIPT cached
- * CPUs which require a guarantee of coherency (no inequivalent
- * aliases with different data, whether clean or not) to operate */
-static inline int parisc_requires_coherency(void)
-{
+/*
+ * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
+ * cached CPUs which require a guarantee of coherency (no inequivalent aliases
+ * with different data, whether clean or not) to operate
+ */
 #ifdef CONFIG_PA8X00
-	return (boot_cpu_data.cpu_type == mako) ||
-		(boot_cpu_data.cpu_type == mako2);
+extern int _parisc_requires_coherency;
+#define parisc_requires_coherency()	_parisc_requires_coherency
 #else
-	return 0;
+#define parisc_requires_coherency()	(0)
 #endif
-}
 
 #endif /* __ASSEMBLY__ */
 

arch/parisc/kernel/processor.c

@@ -44,6 +44,10 @@
 
 struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
 EXPORT_SYMBOL(boot_cpu_data);
+#ifdef CONFIG_PA8X00
+int _parisc_requires_coherency __read_mostly;
+EXPORT_SYMBOL(_parisc_requires_coherency);
+#endif
 
 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 
@@ -277,8 +281,12 @@ void __init collect_boot_cpu_data(void)
 	boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
 	boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
 	boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
-}
 
+#ifdef CONFIG_PA8X00
+	_parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
+				(boot_cpu_data.cpu_type == mako2);
+#endif
+}
 
 
 /**