From owner-svn-src-stable@freebsd.org Mon Oct 29 14:37:28 2018 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 2630310DB6ED; Mon, 29 Oct 2018 14:37:28 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id CDEB573803; Mon, 29 Oct 2018 14:37:27 +0000 (UTC) (envelope-from hselasky@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 AE82C7B92; Mon, 29 Oct 2018 14:37:27 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w9TEbRoV041469; Mon, 29 Oct 2018 14:37:27 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w9TEbRH1041468; Mon, 29 Oct 2018 14:37:27 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201810291437.w9TEbRH1041468@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Mon, 29 Oct 2018 14:37:27 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r339862 - stable/11/sys/sys X-SVN-Group: stable-11 X-SVN-Commit-Author: hselasky X-SVN-Commit-Paths: stable/11/sys/sys X-SVN-Commit-Revision: 339862 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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: Mon, 29 Oct 2018 14:37:28 -0000 Author: hselasky Date: Mon Oct 29 14:37:27 2018 New Revision: 339862 URL: https://svnweb.freebsd.org/changeset/base/339862 Log: MFC r339600: Make sure returned value is checked and assert a valid refcount. While at it fix a print: Unsigned types cannot be negative. Reviewed by: kib, mjg Differential revision: https://reviews.freebsd.org/D17616 Sponsored by: Mellanox Technologies Modified: stable/11/sys/sys/refcount.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/sys/refcount.h ============================================================================== --- stable/11/sys/sys/refcount.h Mon Oct 29 14:36:03 2018 (r339861) +++ stable/11/sys/sys/refcount.h Mon Oct 29 14:37:27 2018 (r339862) @@ -60,7 +60,7 @@ refcount_release(volatile u_int *count) atomic_thread_fence_rel(); old = atomic_fetchadd_int(count, -1); - KASSERT(old > 0, ("negative refcount %p", count)); + KASSERT(old > 0, ("refcount %p is zero", count)); if (old > 1) return (0); @@ -75,15 +75,19 @@ refcount_release(volatile u_int *count) } /* + * This functions returns non-zero if the refcount was + * incremented. Else zero is returned. + * * A temporary hack until refcount_* APIs are sorted out. */ -static __inline int +static __inline __result_use_check int refcount_acquire_if_not_zero(volatile u_int *count) { u_int old; old = *count; for (;;) { + KASSERT(old < UINT_MAX, ("refcount %p overflowed", count)); if (old == 0) return (0); if (atomic_fcmpset_int(count, &old, old + 1)) @@ -91,13 +95,14 @@ refcount_acquire_if_not_zero(volatile u_int *count) } } -static __inline int +static __inline __result_use_check int refcount_release_if_not_last(volatile u_int *count) { u_int old; old = *count; for (;;) { + KASSERT(old > 0, ("refcount %p is zero", count)); if (old == 1) return (0); if (atomic_fcmpset_int(count, &old, old - 1))