[src/trunk]: src/sys/uvm G/C uvm_pagezerocheck

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

details:   https://anonhg.NetBSD.org/src/rev/6289de24bf1a
branches:  trunk
changeset: 938922:6289de24bf1a
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sun Sep 20 10:30:05 2020 +0000

description:
G/C uvm_pagezerocheck

diffstat:

 sys/uvm/uvm_page.c |  48 ++----------------------------------------------
 sys/uvm/uvm_page.h |   7 ++-----
 2 files changed, 4 insertions(+), 51 deletions(-)

diffs (104 lines):

diff -r f61f7058e026 -r 6289de24bf1a sys/uvm/uvm_page.c
--- a/sys/uvm/uvm_page.c        Sun Sep 20 10:29:05 2020 +0000
+++ b/sys/uvm/uvm_page.c        Sun Sep 20 10:30:05 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_page.c,v 1.246 2020/08/15 01:27:22 tnn Exp $       */
+/*     $NetBSD: uvm_page.c,v 1.247 2020/09/20 10:30:05 skrll Exp $     */
 
 /*-
  * Copyright (c) 2019, 2020 The NetBSD Foundation, Inc.
@@ -95,7 +95,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_page.c,v 1.246 2020/08/15 01:27:22 tnn Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_page.c,v 1.247 2020/09/20 10:30:05 skrll Exp $");
 
 #include "opt_ddb.h"
 #include "opt_uvm.h"
@@ -447,14 +447,6 @@
 
        *kvm_startp = round_page(virtual_space_start);
        *kvm_endp = trunc_page(virtual_space_end);
-#ifdef DEBUG
-       /*
-        * steal kva for uvm_pagezerocheck().
-        */
-       uvm_zerocheckkva = *kvm_startp;
-       *kvm_startp += PAGE_SIZE;
-       mutex_init(&uvm_zerochecklock, MUTEX_DEFAULT, IPL_VM);
-#endif /* DEBUG */
 
        /*
         * init various thresholds.
@@ -1427,42 +1419,6 @@
        return error;
 }
 
-#ifdef DEBUG
-/*
- * check if page is zero-filled
- */
-void
-uvm_pagezerocheck(struct vm_page *pg)
-{
-       int *p, *ep;
-
-       KASSERT(uvm_zerocheckkva != 0);
-
-       /*
-        * XXX assuming pmap_kenter_pa and pmap_kremove never call
-        * uvm page allocator.
-        *
-        * it might be better to have "CPU-local temporary map" pmap interface.
-        */
-       mutex_spin_enter(&uvm_zerochecklock);
-       pmap_kenter_pa(uvm_zerocheckkva, VM_PAGE_TO_PHYS(pg), VM_PROT_READ, 0);
-       p = (int *)uvm_zerocheckkva;
-       ep = (int *)((char *)p + PAGE_SIZE);
-       pmap_update(pmap_kernel());
-       while (p < ep) {
-               if (*p != 0)
-                       panic("zero page isn't zero-filled");
-               p++;
-       }
-       pmap_kremove(uvm_zerocheckkva, PAGE_SIZE);
-       mutex_spin_exit(&uvm_zerochecklock);
-       /*
-        * pmap_update() is not necessary here because no one except us
-        * uses this VA.
-        */
-}
-#endif /* DEBUG */
-
 /*
  * uvm_pagefree: free page
  *
diff -r f61f7058e026 -r 6289de24bf1a sys/uvm/uvm_page.h
--- a/sys/uvm/uvm_page.h        Sun Sep 20 10:29:05 2020 +0000
+++ b/sys/uvm/uvm_page.h        Sun Sep 20 10:30:05 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_page.h,v 1.105 2020/06/14 21:41:42 ad Exp $        */
+/*     $NetBSD: uvm_page.h,v 1.106 2020/09/20 10:30:05 skrll Exp $     */
 
 /*
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -404,6 +404,7 @@
 
 #ifdef __HAVE_VM_PAGE_MD
 #define        VM_PAGE_TO_MD(pg)       (&(pg)->mdpage)
+#define        VM_MD_TO_PAGE(md)       (container_of((md), struct vm_page, mdpage))
 #endif
 
 /*
@@ -470,10 +471,6 @@
        pg->phys_addr |= __SHIFTIN(b, UVM_PHYSADDR_BUCKET);
 }
 
-#ifdef DEBUG
-void uvm_pagezerocheck(struct vm_page *);
-#endif /* DEBUG */
-
 #endif /* _KERNEL */
 
 #endif /* _UVM_UVM_PAGE_H_ */