Author: kib
Date: Sat Nov 4 10:10:34 2017
New Revision: 325385
URL: https://svnweb.freebsd.org/changeset/base/325385
Log:
MFC r324824:
Check that the page which is freed as zeroed, indeed has all-zero content.
Modified:
stable/11/sys/vm/vm_page.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/vm/vm_page.c
==============================================================================
--- stable/11/sys/vm/vm_page.c Sat Nov 4 07:05:21 2017 (r325384)
+++ stable/11/sys/vm/vm_page.c Sat Nov 4 10:10:34 2017 (r325385)
@@ -2767,6 +2767,16 @@ bool
vm_page_free_prep(vm_page_t m, bool pagequeue_locked)
{
+#if defined(DIAGNOSTIC) && defined(PHYS_TO_DMAP)
+ if ((m->flags & PG_ZERO) != 0) {
+ uint64_t *p;
+ int i;
+ p = (uint64_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
+ for (i = 0; i < PAGE_SIZE / sizeof(uint64_t); i++, p++)
+ KASSERT(*p == 0, ("vm_page_free_prep %p PG_ZERO %d %jx",
+ m, i, (uintmax_t)*p));
+ }
+#endif
if ((m->oflags & VPO_UNMANAGED) == 0) {
vm_page_lock_assert(m, MA_OWNED);
KASSERT(!pmap_page_is_mapped(m),
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