From owner-svn-src-stable@freebsd.org Wed Jun 20 06:46:55 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 583291005131; Wed, 20 Jun 2018 06:46:55 +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 08EE36BB78; Wed, 20 Jun 2018 06:46:55 +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 D3DC61EC8E; Wed, 20 Jun 2018 06:46:54 +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 w5K6kshf026185; Wed, 20 Jun 2018 06:46:54 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w5K6ksIP026184; Wed, 20 Jun 2018 06:46:54 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201806200646.w5K6ksIP026184@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Wed, 20 Jun 2018 06:46:54 +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: r335422 - stable/11/sys/compat/linuxkpi/common/include/asm X-SVN-Group: stable-11 X-SVN-Commit-Author: hselasky X-SVN-Commit-Paths: stable/11/sys/compat/linuxkpi/common/include/asm X-SVN-Commit-Revision: 335422 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: 2.1.26 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: Wed, 20 Jun 2018 06:46:55 -0000 Author: hselasky Date: Wed Jun 20 06:46:54 2018 New Revision: 335422 URL: https://svnweb.freebsd.org/changeset/base/335422 Log: MFC r334712 and r334718: Implement the atomic_dec_if_positive() function in the LinuxKPI. Submitted by: Johannes Lundberg Sponsored by: Mellanox Technologies Sponsored by: Limelight Networks Modified: stable/11/sys/compat/linuxkpi/common/include/asm/atomic.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/compat/linuxkpi/common/include/asm/atomic.h ============================================================================== --- stable/11/sys/compat/linuxkpi/common/include/asm/atomic.h Wed Jun 20 06:43:41 2018 (r335421) +++ stable/11/sys/compat/linuxkpi/common/include/asm/atomic.h Wed Jun 20 06:46:54 2018 (r335422) @@ -235,6 +235,23 @@ atomic_cmpxchg(atomic_t *v, int old, int new) __ret.val; \ }) +static inline int +atomic_dec_if_positive(atomic_t *v) +{ + int retval; + int old; + + old = atomic_read(v); + for (;;) { + retval = old - 1; + if (unlikely(retval < 0)) + break; + if (likely(atomic_fcmpset_int(&v->counter, &old, retval))) + break; + } + return (retval); +} + #define LINUX_ATOMIC_OP(op, c_op) \ static inline void atomic_##op(int i, atomic_t *v) \ { \