From owner-svn-src-all@freebsd.org Sun Jun 23 21:06:57 2019 Return-Path: Delivered-To: svn-src-all@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 3D42115DB366; Sun, 23 Jun 2019 21:06:57 +0000 (UTC) (envelope-from alc@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 A70186FD8F; Sun, 23 Jun 2019 21:06:56 +0000 (UTC) (envelope-from alc@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 954AA27386; Sun, 23 Jun 2019 21:06:56 +0000 (UTC) (envelope-from alc@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x5NL6u6m020225; Sun, 23 Jun 2019 21:06:56 GMT (envelope-from alc@FreeBSD.org) Received: (from alc@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x5NL6u1i020224; Sun, 23 Jun 2019 21:06:56 GMT (envelope-from alc@FreeBSD.org) Message-Id: <201906232106.x5NL6u1i020224@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: alc set sender to alc@FreeBSD.org using -f From: Alan Cox Date: Sun, 23 Jun 2019 21:06:56 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r349323 - head/sys/arm64/arm64 X-SVN-Group: head X-SVN-Commit-Author: alc X-SVN-Commit-Paths: head/sys/arm64/arm64 X-SVN-Commit-Revision: 349323 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: A70186FD8F X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.95 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.95)[-0.947,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Jun 2019 21:06:57 -0000 Author: alc Date: Sun Jun 23 21:06:56 2019 New Revision: 349323 URL: https://svnweb.freebsd.org/changeset/base/349323 Log: pmap_enter_quick_locked() never replaces a valid mapping, so it need not perform a TLB invalidation. A barrier suffices. (See r343876.) Add a comment to pmap_enter_quick_locked() in order to highlight the fact that it does not replace valid mappings. Correct a typo in one of pmap_enter()'s comments. MFC after: 1 week Modified: head/sys/arm64/arm64/pmap.c Modified: head/sys/arm64/arm64/pmap.c ============================================================================== --- head/sys/arm64/arm64/pmap.c Sun Jun 23 19:37:12 2019 (r349322) +++ head/sys/arm64/arm64/pmap.c Sun Jun 23 21:06:56 2019 (r349323) @@ -3408,7 +3408,7 @@ validate: __func__, pmap, va, new_l3); } } else { - /* New mappig */ + /* New mapping */ pmap_load_store(l3, new_l3); dsb(ishst); } @@ -3706,6 +3706,9 @@ pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, v l3 = pmap_l2_to_l3(pde, va); } + /* + * Abort if a mapping already exists. + */ if (pmap_load(l3) != 0) { if (mpte != NULL) { mpte->wire_count--; @@ -3755,7 +3758,7 @@ pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, v cpu_icache_sync_range(PHYS_TO_DMAP(pa), PAGE_SIZE); pmap_load_store(l3, l3_val); - pmap_invalidate_page(pmap, va); + dsb(ishst); return (mpte); }