Date: Sat, 4 Nov 2017 10:10:34 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r325385 - stable/11/sys/vm Message-ID: <201711041010.vA4AAYsj080277@repo.freebsd.org>
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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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