arm64: Remove signal translation and exec_domain

As execution domain support is gone we can remove
signal translation from the signal code and remove
exec_domain from thread_info.
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/arm64/include/asm/thread_info.h

@@ -33,7 +33,6 @@
 #ifndef __ASSEMBLY__
 
 struct task_struct;
-struct exec_domain;
 
 #include <asm/types.h>
 
@@ -47,7 +46,6 @@ struct thread_info {
 	unsigned long		flags;		/* low level flags */
 	mm_segment_t		addr_limit;	/* address limit */
 	struct task_struct	*task;		/* main task structure */
-	struct exec_domain	*exec_domain;	/* execution domain */
 	int			preempt_count;	/* 0 => preemptable, <0 => bug */
 	int			cpu;		/* cpu */
 };
@@ -55,7 +53,6 @@ struct thread_info {
 #define INIT_THREAD_INFO(tsk)						\
 {									\
 	.task		= &tsk,						\
-	.exec_domain	= &default_exec_domain,				\
 	.flags		= 0,						\
 	.preempt_count	= INIT_PREEMPT_COUNT,				\
 	.addr_limit	= KERNEL_DS,					\

arch/arm64/kernel/asm-offsets.c

@@ -38,7 +38,6 @@ int main(void)
   DEFINE(TI_PREEMPT,		offsetof(struct thread_info, preempt_count));
   DEFINE(TI_ADDR_LIMIT,		offsetof(struct thread_info, addr_limit));
   DEFINE(TI_TASK,		offsetof(struct thread_info, task));
-  DEFINE(TI_EXEC_DOMAIN,	offsetof(struct thread_info, exec_domain));
   DEFINE(TI_CPU,		offsetof(struct thread_info, cpu));
   BLANK();
   DEFINE(THREAD_CPU_CONTEXT,	offsetof(struct task_struct, thread.cpu_context));

arch/arm64/kernel/signal.c

@@ -293,12 +293,6 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
 	int usig = ksig->sig;
 	int ret;
 
-	/*
-	 * translate the signal
-	 */
-	if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
-		usig = thread->exec_domain->signal_invmap[usig];
-
 	/*
 	 * Set up the stack frame
 	 */