s390/syscalls: Remove system call table pointer from thread_struct

With compat support gone there is only one system call table
left. Therefore remove the sys_call_table pointer from
thread_struct and use the sys_call_table directly.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: hcahca

arch/s390/include/asm/elf.h

@@ -217,7 +217,6 @@ extern char elf_platform[];
 do {								\
 	set_personality(PER_LINUX |				\
 		(current->personality & (~PER_MASK)));		\
-	current->thread.sys_call_table = sys_call_table;	\
 } while (0)
 
 /*

arch/s390/include/asm/processor.h

@@ -175,7 +175,6 @@ struct thread_struct {
 	unsigned long system_timer;		/* task cputime in kernel space */
 	unsigned long hardirq_timer;		/* task cputime in hardirq context */
 	unsigned long softirq_timer;		/* task cputime in softirq context */
-	const sys_call_ptr_t *sys_call_table;	/* system call table address */
 	union teid gmap_teid;			/* address and flags of last gmap fault */
 	unsigned int gmap_int_code;		/* int code of last gmap fault */
 	int ufpu_flags;				/* user fpu flags */

arch/s390/kernel/syscall.c

@@ -122,7 +122,7 @@ void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
 		goto out;
 	regs->gprs[2] = -ENOSYS;
 	if (likely(nr < NR_syscalls))
-		regs->gprs[2] = current->thread.sys_call_table[nr](regs);
+		regs->gprs[2] = sys_call_table[nr](regs);
 out:
 	syscall_exit_to_user_mode(regs);
 }