ARCH: AUDIT: implement syscall_get_arch for all arches

For all arches which support audit implement syscall_get_arch()
They are all pretty easy and straight forward, stolen from how the call
to audit_syscall_entry() determines the arch.

Based-on-patch-by: Richard Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
Cc: linux-ia64@vger.kernel.org
Cc: microblaze-uclinux@itee.uq.edu.au
Cc: linux-mips@linux-mips.org
Cc: linux@lists.openrisc.net
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: sparclinux@vger.kernel.org
diff --git a/arch/parisc/include/asm/syscall.h b/arch/parisc/include/asm/syscall.h
index 8bdfd2c..a5eba95 100644
--- a/arch/parisc/include/asm/syscall.h
+++ b/arch/parisc/include/asm/syscall.h
@@ -3,6 +3,8 @@
 #ifndef _ASM_PARISC_SYSCALL_H_
 #define _ASM_PARISC_SYSCALL_H_
 
+#include <uapi/linux/audit.h>
+#include <linux/compat.h>
 #include <linux/err.h>
 #include <asm/ptrace.h>
 
@@ -37,4 +39,13 @@
 	}
 }
 
+static inline int syscall_get_arch(void)
+{
+	int arch = AUDIT_ARCH_PARISC;
+#ifdef CONFIG_64BIT
+	if (!is_compat_task())
+		arch = AUDIT_ARCH_PARISC64;
+#endif
+	return arch;
+}
 #endif /*_ASM_PARISC_SYSCALL_H_*/