Date: Mon, 1 Feb 2021 12:40:47 GMT From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 872a0097fd81 - stable/13 - tmpfs: drop acq fence now that vn_load_v_data_smr has consume semantics Message-ID: <202102011240.111CelwN097275@gitrepo.freebsd.org>
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The branch stable/13 has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=872a0097fd81235cea5730e642daf725e8bf8afc commit 872a0097fd81235cea5730e642daf725e8bf8afc Author: Mateusz Guzik <mjg@FreeBSD.org> AuthorDate: 2021-01-25 20:17:48 +0000 Commit: Mateusz Guzik <mjg@FreeBSD.org> CommitDate: 2021-02-01 12:39:16 +0000 tmpfs: drop acq fence now that vn_load_v_data_smr has consume semantics (cherry picked from commit c09f7992714559eaa874f13ea4a1d648f199cd08) --- sys/fs/tmpfs/tmpfs_subr.c | 3 --- sys/fs/tmpfs/tmpfs_vnops.c | 1 - 2 files changed, 4 deletions(-) diff --git a/sys/fs/tmpfs/tmpfs_subr.c b/sys/fs/tmpfs/tmpfs_subr.c index 3b3581fc81f6..84473a439c43 100644 --- a/sys/fs/tmpfs/tmpfs_subr.c +++ b/sys/fs/tmpfs/tmpfs_subr.c @@ -356,9 +356,6 @@ tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *tmp, enum vtype type, * pointer to also get the above content in a stable manner. * Worst case tn_link_smr flag may be set to true despite being stale, * while the target buffer is already cleared out. - * - * TODO: Since there is no load consume primitive provided - * right now, the load is performed with an acquire fence. */ atomic_store_ptr(&nnode->tn_link_target, symlink); atomic_store_char((char *)&nnode->tn_link_smr, symlink_smr); diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c index bc4caa4adecb..7be2655dcf0b 100644 --- a/sys/fs/tmpfs/tmpfs_vnops.c +++ b/sys/fs/tmpfs/tmpfs_vnops.c @@ -1471,7 +1471,6 @@ tmpfs_fplookup_symlink(struct vop_fplookup_symlink_args *v) vp = v->a_vp; node = VP_TO_TMPFS_NODE_SMR(vp); - atomic_thread_fence_acq(); if (__predict_false(node == NULL)) return (EAGAIN); if (!atomic_load_char(&node->tn_link_smr))
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