signal/x86: Remove the pkey parameter from do_sigbus

The function do_sigbus never sets si_code to PKUERR so it can never
return a pkey to userspace.  Therefore remove the unusable pkey
parameter from do_sigbus.
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: N"Eric W. Biederman" <ebiederm@xmission.com>

arch/x86/mm/fault.c

@@ -962,7 +962,7 @@ bad_area_access_error(struct pt_regs *regs, unsigned long error_code,
 
 static void
 do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
-	  u32 *pkey, unsigned int fault)
+	  unsigned int fault)
 {
 	struct task_struct *tsk = current;
 
@@ -995,7 +995,7 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
 		return;
 	}
 #endif
-	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk, pkey);
+	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk, NULL);
 }
 
 static noinline void
@@ -1024,7 +1024,7 @@ mm_fault_error(struct pt_regs *regs, unsigned long error_code,
 	} else {
 		if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|
 			     VM_FAULT_HWPOISON_LARGE))
-			do_sigbus(regs, error_code, address, pkey, fault);
+			do_sigbus(regs, error_code, address, fault);
 		else if (fault & VM_FAULT_SIGSEGV)
 			bad_area_nosemaphore(regs, error_code, address);
 		else