Changes to exit handling.

cpu_exit no longer frees the vmspace and u-area. This is now handled by a
separate kernel thread "reaper". This is to avoid sleeping locks in the
critical path of cpu_exit where we're not allowed to sleep.

From NetBSD

3 files changed, 6 insertions, 9 deletions

diff --git a/sys/arch/kbus/include/pmap.h b/sys/arch/kbus/include/pmap.h
index 228516d859a..7f338b611d8 100644
--- a/sys/arch/kbus/include/pmap.h
+++ b/sys/arch/kbus/include/pmap.h
@@ -294,7 +294,8 @@ void pmap_bootstrap __P((vm_offset_t firstaddr));
 void pmap_disp_va __P((pmap_t pmap, vm_offset_t va));
 vm_offset_t pmap_map __P((vm_offset_t, vm_offset_t, vm_offset_t, int));
 struct user;
-void switchexit __P((vm_map_t, struct user *, int));
+struct proc;
+void switchexit __P((struct proc *));
 
 #endif	/* _KERNEL */
 #endif /* !_LOCORE */
diff --git a/sys/arch/kbus/kbus/locore.s b/sys/arch/kbus/kbus/locore.s
index 7c63f5c7938..97945eab30c 100644
--- a/sys/arch/kbus/kbus/locore.s
+++ b/sys/arch/kbus/kbus/locore.s
@@ -3087,8 +3087,6 @@ ENTRY(write_user_windows)
  */
 ENTRY(switchexit)
 	mov	%o0, %g2		! save the
-	mov	%o1, %g3		! ... three parameters
-	mov	%o2, %g4		! ... to kmem_free
 
 	/*
 	 * Change pcb to idle u. area, i.e., set %sp to top of stack
@@ -3119,10 +3117,8 @@ ENTRY(switchexit)
 	SET_SP_REDZONE(%l6, %l5)
 #endif
 	wr	%g0, PSR_S|PSR_ET, %psr	! and then enable traps
-	mov	%g2, %o0		! now ready to call kmem_free
-	mov	%g3, %o1
-	call	_kmem_free
-	 mov	%g4, %o2
+	call	_exit2
+	 mov	%g2, %o0
 
 	/*
 	 * Now fall through to `the last switch'.  %g6 was set to
diff --git a/sys/arch/kbus/kbus/vm_machdep.c b/sys/arch/kbus/kbus/vm_machdep.c
index 7c054c2029f..c80e06aa8d2 100644
--- a/sys/arch/kbus/kbus/vm_machdep.c
+++ b/sys/arch/kbus/kbus/vm_machdep.c
@@ -437,8 +437,8 @@ cpu_exit(p)
 		}
 		free((void *)fs, M_SUBPROC);
 	}
-	vmspace_free(p->p_vmspace);
-	switchexit(kernel_map, p->p_addr, USPACE);
+
+	switchexit(p);
 	/* NOTREACHED */
 }