From nobody Fri Jun 13 17:32:40 2025 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4bJmgX6RXzz5xkmb; Fri, 13 Jun 2025 17:32:40 +0000 (UTC) (envelope-from git@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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R11" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4bJmgX4Tl5z3q4m; Fri, 13 Jun 2025 17:32:40 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1749835960; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=5NtmRTfp6/dbSlYlwcCsAx42q1dY32EbrLHuiU92Ls8=; b=NX+AjYgUeoLB/+81sigZrhK+Q9sLXRHykypess9OUCmMt298XZHGtfo9UxYmnIogl4FEwO fVRammdn2DqV/Ld1Y/DTZkR2ysy7mcKnEWRp1ix8U1woHZvNu+JYzHVbK5Kvx4MzKcOBcF zLoKlzuG/YU9BtcsLq7LttD3MChziSb7yUCkEydmRsZL4tQoS4Qb3cIxhuScXIcjiNSBf5 aSq6w4lNUK0qBCYjpPCBbFQY/qQmUNe9QXIUav18dL9rASfQv9wWZI3JPEAzixFqpm5KHD pv0bvlSTsCCpYwMj5SU9BPpMXE2c4ZrhVnco+HrnSCVj9XYuewF3QXeiL1tBNA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1749835960; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=5NtmRTfp6/dbSlYlwcCsAx42q1dY32EbrLHuiU92Ls8=; b=SauzcNL+7N8RRox/OYibleRCGOsv66K2YDAxcIBL5RLXoGd9Oms/0CcgHwE0AV66lxq+3l XxfVwx+Ov7iT3G8/bw4bqyhmLtv6qfynYRgMLPeBLxgGUlikfzU4/sn4X4WThxUZSDUSmN WoIY+FYL3BGS4iDG9qYHMR+3oXX/dXaUCgrrUW7rm3/6YFsixQZKzWc2RhwXoPsu8q5nQk dHDlMJKDsHwD6O+lI3T2ugWHbwxFDcd0RIsOmktWUHkQqQiy2n44MLONSoXw1QzBTBl2Jr 3HBF/Awic1grElI7q0OwA/XfWZ+54hA7mYQepgy55zHBKrEEC80Sfj9VCTMgyg== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1749835960; a=rsa-sha256; cv=none; b=uPcVw43YklDv3Rzzl9u0RNoSDRnL8O80nYOtkYyRtG2gj1BD2pxIJ3CiShanEx97UoMI3h bR83xOyj3Gs4Jiz9LH9fK0GBSqaj6ZJ3KGCGDmCkkDHpPMTh2IcqKL+6EKrCCKxTy08aal WiWEuOI+bHYg54aFCamGqfc7obU+KERNNu7+T55n9X7oJP8KaRfxGIpT2WT+XDdWxNwLY4 0FBu/FDZI+xKwR7q+O0ffHm/WyQ1W/lAuICFCTRU8xMbVib2m+3O8XgwtjgPRyG0hwA6q1 izP4REsh87ZKSdZ4Po9TV/JW1hEhAPvMTDEQqLsH+kBVZfW4GRI5Wxv1Ef/nvg== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4bJmgX3y85z16d1; Fri, 13 Jun 2025 17:32:40 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.18.1/8.18.1) with ESMTP id 55DHWeIw009097; Fri, 13 Jun 2025 17:32:40 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.18.1/8.18.1/Submit) id 55DHWeGV009093; Fri, 13 Jun 2025 17:32:40 GMT (envelope-from git) Date: Fri, 13 Jun 2025 17:32:40 GMT Message-Id: <202506131732.55DHWeGV009093@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Alan Cox Subject: git: b7536f9593a3 - main - arm64 pmap: Simplify pmap_demote_l{2,3}c() List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: alc X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: b7536f9593a30b8253546214f53c9ef063c656a9 Auto-Submitted: auto-generated The branch main has been updated by alc: URL: https://cgit.FreeBSD.org/src/commit/?id=b7536f9593a30b8253546214f53c9ef063c656a9 commit b7536f9593a30b8253546214f53c9ef063c656a9 Author: Alan Cox AuthorDate: 2025-06-09 06:34:13 +0000 Commit: Alan Cox CommitDate: 2025-06-13 17:31:53 +0000 arm64 pmap: Simplify pmap_demote_l{2,3}c() Simplify the loop for remaking the mappings in pmap_demote_l{2,3}c(). Since the mappings are invalid, we needn't use an atomic read-modify- write operation to remake the mappings. The accessed and dirty bits won't concurrently change. --- sys/arm64/arm64/pmap.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c index f8e422848e94..3529314b07c7 100644 --- a/sys/arm64/arm64/pmap.c +++ b/sys/arm64/arm64/pmap.c @@ -8662,10 +8662,10 @@ pmap_demote_l2c(pmap_t pmap, pt_entry_t *l2p, vm_offset_t va) /* * Remake the mappings, updating the accessed and dirty bits. */ + l2e = (pmap_load(l2c_start) & ~mask) | nbits; for (tl2p = l2c_start; tl2p < l2c_end; tl2p++) { - l2e = pmap_load(tl2p); - while (!atomic_fcmpset_64(tl2p, &l2e, (l2e & ~mask) | nbits)) - cpu_spinwait(); + pmap_store(tl2p, l2e); + l2e += L2_SIZE; } dsb(ishst); @@ -8751,10 +8751,10 @@ pmap_demote_l3c(pmap_t pmap, pt_entry_t *l3p, vm_offset_t va) /* * Remake the mappings, updating the accessed and dirty bits. */ + l3e = (pmap_load(l3c_start) & ~mask) | nbits; for (tl3p = l3c_start; tl3p < l3c_end; tl3p++) { - l3e = pmap_load(tl3p); - while (!atomic_fcmpset_64(tl3p, &l3e, (l3e & ~mask) | nbits)) - cpu_spinwait(); + pmap_store(tl3p, l3e); + l3e += L3_SIZE; } dsb(ishst);