[src/trunk]: src/sys/arch/x86/x86 dedup code around pmap_reactivate() - do th...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b8d013435257
branches:  trunk
changeset: 830304:b8d013435257
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Sun Mar 04 10:26:10 2018 +0000

description:
dedup code around pmap_reactivate() - do the actual TLB flush also

diffstat:

 sys/arch/x86/x86/pmap.c |  40 ++++++++++++++--------------------------
 1 files changed, 14 insertions(+), 26 deletions(-)

diffs (96 lines):

diff -r ec7bbda55dcb -r b8d013435257 sys/arch/x86/x86/pmap.c
--- a/sys/arch/x86/x86/pmap.c   Sun Mar 04 10:13:08 2018 +0000
+++ b/sys/arch/x86/x86/pmap.c   Sun Mar 04 10:26:10 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.283 2018/03/04 10:13:09 jdolecek Exp $      */
+/*     $NetBSD: pmap.c,v 1.284 2018/03/04 10:26:10 jdolecek Exp $      */
 
 /*
  * Copyright (c) 2008, 2010, 2016, 2017 The NetBSD Foundation, Inc.
@@ -170,7 +170,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.283 2018/03/04 10:13:09 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.284 2018/03/04 10:26:10 jdolecek Exp $");
 
 #include "opt_user_ldt.h"
 #include "opt_lockdebug.h"
@@ -581,7 +581,7 @@
 static paddr_t pmap_get_physpage(void);
 static void pmap_alloc_level(struct pmap *, vaddr_t, long *);
 
-static bool pmap_reactivate(struct pmap *);
+static void pmap_reactivate(struct pmap *);
 
 /*
  * p m a p   h e l p e r   f u n c t i o n s
@@ -757,11 +757,7 @@
                 * often the case during exit(), when we have switched
                 * to the kernel pmap in order to destroy a user pmap.
                 */
-               if (!pmap_reactivate(pmap)) {
-                       u_int gen = uvm_emap_gen_return();
-                       tlbflush();
-                       uvm_emap_update(gen);
-               }
+               pmap_reactivate(pmap);
        } else {
                /*
                 * Toss current pmap from CPU, but keep a reference to it.
@@ -2877,12 +2873,11 @@
  * => Must be called with kernel preemption disabled.
  */
 
-static bool
+static void
 pmap_reactivate(struct pmap *pmap)
 {
        struct cpu_info * const ci = curcpu();
        const cpuid_t cid = cpu_index(ci);
-       bool result;
 
        KASSERT(kpreempt_disabled());
 #if defined(XEN) && defined(__x86_64__)
@@ -2908,13 +2903,17 @@
 
        if (kcpuset_isset(pmap->pm_cpus, cid)) {
                /* We have the reference, state is valid. */
-               result = true;
        } else {
-               /* Must reload the TLB. */
+               /*
+                * Must reload the TLB, pmap has been changed during
+                * deactivated.
+                */
                kcpuset_atomic_set(pmap->pm_cpus, cid);
-               result = false;
+
+               u_int gen = uvm_emap_gen_return();
+               tlbflush();
+               uvm_emap_update(gen);
        }
-       return result;
 }
 
 /*
@@ -2964,18 +2963,7 @@
        pcb = lwp_getpcb(l);
 
        if (pmap == oldpmap) {
-               if (!pmap_reactivate(pmap)) {
-                       u_int gen = uvm_emap_gen_return();
-
-                       /*
-                        * pmap has been changed during deactivated.
-                        * our tlb may be stale.
-                        */
-
-                       tlbflush();
-                       uvm_emap_update(gen);
-               }
-
+               pmap_reactivate(pmap);
                ci->ci_want_pmapload = 0;
                kpreempt_enable();
                return;