From owner-svn-src-stable@freebsd.org Tue Jun 4 17:29:48 2019 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C7DC815B83B9; Tue, 4 Jun 2019 17:29:48 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 67ECA7495C; Tue, 4 Jun 2019 17:29:48 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 3C4BE20AD7; Tue, 4 Jun 2019 17:29:48 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x54HTmY2098082; Tue, 4 Jun 2019 17:29:48 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x54HTmFl098081; Tue, 4 Jun 2019 17:29:48 GMT (envelope-from markj@FreeBSD.org) Message-Id: <201906041729.x54HTmFl098081@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Tue, 4 Jun 2019 17:29:48 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r348642 - stable/12/sys/riscv/riscv X-SVN-Group: stable-12 X-SVN-Commit-Author: markj X-SVN-Commit-Paths: stable/12/sys/riscv/riscv X-SVN-Commit-Revision: 348642 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 67ECA7495C X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.97 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.97)[-0.973,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jun 2019 17:29:49 -0000 Author: markj Date: Tue Jun 4 17:29:47 2019 New Revision: 348642 URL: https://svnweb.freebsd.org/changeset/base/348642 Log: MFC r340159 (by jhb): Rework setting PTE_D for kernel mappings. Modified: stable/12/sys/riscv/riscv/pmap.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/riscv/riscv/pmap.c ============================================================================== --- stable/12/sys/riscv/riscv/pmap.c Tue Jun 4 17:29:20 2019 (r348641) +++ stable/12/sys/riscv/riscv/pmap.c Tue Jun 4 17:29:47 2019 (r348642) @@ -2010,13 +2010,20 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, v new_l3 |= PTE_W; if ((va >> 63) == 0) new_l3 |= PTE_U; - else if (prot & VM_PROT_WRITE) - new_l3 |= PTE_D; new_l3 |= (pn << PTE_PPN0_S); if ((flags & PMAP_ENTER_WIRED) != 0) new_l3 |= PTE_SW_WIRED; - if ((m->oflags & VPO_UNMANAGED) == 0) + + /* + * Set modified bit gratuitously for writeable mappings if + * the page is unmanaged. We do not want to take a fault + * to do the dirty bit accounting for these mappings. + */ + if ((m->oflags & VPO_UNMANAGED) != 0) { + if (prot & VM_PROT_WRITE) + new_l3 |= PTE_D; + } else new_l3 |= PTE_SW_MANAGED; CTR2(KTR_PMAP, "pmap_enter: %.16lx -> %.16lx", va, pa);