{stop,start}_vmspace_proc: take a proc argument

While the process will currently be curproc it's more consistant with
other code in the revoker to take struct proc *.

sys/kern/kern_cheri_revoke.c

@@ -427,9 +427,7 @@ kern_cheri_revoke(struct thread *td, int flags,
 				return ERESTART;
 			}
 		}
-		KASSERT(td->td_proc == curproc,
-		    ("stop_vmspace_proc only works with curproc"));
-		stop_vmspace_proc();
+		stop_vmspace_proc(td->td_proc);
 
 		/*
 		 * Drop the process lock *then* iterate the threads in this
@@ -537,7 +535,7 @@ kern_cheri_revoke(struct thread *td, int flags,
 
 	PROC_LOCK(td->td_proc);
 	_PRELE(td->td_proc);
-	resume_vmspace_proc();
+	resume_vmspace_proc(td->td_proc);
 	if ((td->td_proc->p_flag & P_HADTHREADS) != 0) {
 		thread_single_end(td->td_proc, SINGLE_BOUNDARY);
 	}

sys/kern/kern_proc.c

@@ -3859,9 +3859,9 @@ resume_all_proc(void)
  * curproc.  It should be run after curproc has entered thread_single.
  */
 void
-stop_vmspace_proc(void)
+stop_vmspace_proc(struct proc* cp)
 {
-	struct proc *cp, *p;
+	struct proc *p;
 	struct vmspace *vm;
 	int r, gen;
 	bool restart, seen_stopped, seen_exiting, stopped_some;
@@ -3871,7 +3871,6 @@ stop_vmspace_proc(void)
 	 * Maybe atomic CAS on a field in vmspace?
 	 */
 
-	cp = curproc;
 	vm = cp->p_vmspace;
 vmspace_loop:
 	VMSPACE_LOCK(vm);
@@ -3932,12 +3931,11 @@ stop_vmspace_proc(void)
 }
 
 void
-resume_vmspace_proc(void)
+resume_vmspace_proc(struct proc *cp)
 {
-	struct proc *cp, *p;
+	struct proc *p;
 	struct vmspace *vm;
 
-	cp = curproc;
 	vm = cp->p_vmspace;
 
 	VMSPACE_LOCK(vm);

sys/sys/proc.h

@@ -1300,8 +1300,8 @@ void	stop_all_proc_unblock(void);
 
 void	stop_all_proc(void);
 void	resume_all_proc(void);
-void	stop_vmspace_proc(void);
-void	resume_vmspace_proc(void);
+void	stop_vmspace_proc(struct proc *cp);
+void	resume_vmspace_proc(struct proc *cp);
 
 static __inline int
 curthread_pflags_set(int flags)