microblaze_mmu_v2: Enable fork syscall for MMU and add fork as vfork for noMMU

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/entry-nommu.S

@@ -10,7 +10,7 @@
 
 #include <linux/linkage.h>
 #include <asm/thread_info.h>
-#include <asm/errno.h>
+#include <linux/errno.h>
 #include <asm/entry.h>
 #include <asm/asm-offsets.h>
 #include <asm/registers.h>

arch/microblaze/kernel/syscall_table.S

@@ -2,7 +2,11 @@ ENTRY(sys_call_table)
 	.long sys_restart_syscall	/* 0 - old "setup()" system call,
 					 * used for restarting */
 	.long sys_exit
-	.long sys_ni_syscall		/* was fork */
+#ifdef CONFIG_MMU
+	.long sys_fork_wrapper
+#else
+	.long sys_ni_syscall
+#endif
 	.long sys_read
 	.long sys_write
 	.long sys_open			/* 5 */