sparc: get rid of memory_ordering(2) wrapper

use current_pt_regs() in it instead
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sparc/kernel/sys_sparc_64.c

@@ -606,9 +606,9 @@ SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
 	return 0;
 }
 
-asmlinkage long sparc_memory_ordering(unsigned long model,
-				      struct pt_regs *regs)
+SYSCALL_DEFINE1(memory_ordering, unsigned long, model)
 {
+	struct pt_regs *regs = current_pt_regs();
 	if (model >= 3)
 		return -EINVAL;
 	regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);

arch/sparc/kernel/syscalls.S

@@ -30,9 +30,6 @@ sys32_execveat:
 sys_nis_syscall:
 	ba,pt	%xcc, c_sys_nis_syscall
 	 add	%sp, PTREGS_OFF, %o0
-sys_memory_ordering:
-	ba,pt	%xcc, sparc_memory_ordering
-	 add	%sp, PTREGS_OFF, %o1
 #ifdef CONFIG_COMPAT
 sys32_sigstack:
 	ba,pt	%xcc, do_sys32_sigstack

arch/sparc/kernel/systbls.h

@@ -46,8 +46,7 @@ asmlinkage long sys_utrap_install(utrap_entry_t type,
 				  utrap_handler_t new_d,
 				  utrap_handler_t __user *old_p,
 				  utrap_handler_t __user *old_d);
-asmlinkage long sparc_memory_ordering(unsigned long model,
-				      struct pt_regs *regs);
+asmlinkage long sys_memory_ordering(unsigned long model);
 asmlinkage void sparc64_set_context(struct pt_regs *regs);
 asmlinkage void sparc64_get_context(struct pt_regs *regs);
 asmlinkage long sys32_truncate64(const char __user * path,