From owner-svn-src-head@freebsd.org Sun May 17 20:09:11 2020 Return-Path: Delivered-To: svn-src-head@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id B9AD12F2ADE; Sun, 17 May 2020 20:09:11 +0000 (UTC) (envelope-from manu@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 "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 49QCsM493Vz4qTS; Sun, 17 May 2020 20:09:11 +0000 (UTC) (envelope-from manu@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 85C6915DA9; Sun, 17 May 2020 20:09:11 +0000 (UTC) (envelope-from manu@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 04HK9BZA064777; Sun, 17 May 2020 20:09:11 GMT (envelope-from manu@FreeBSD.org) Received: (from manu@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 04HK9B68064776; Sun, 17 May 2020 20:09:11 GMT (envelope-from manu@FreeBSD.org) Message-Id: <202005172009.04HK9B68064776@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: manu set sender to manu@FreeBSD.org using -f From: Emmanuel Vadot Date: Sun, 17 May 2020 20:09:11 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r361138 - head/sys/compat/linuxkpi/common/include/linux X-SVN-Group: head X-SVN-Commit-Author: manu X-SVN-Commit-Paths: head/sys/compat/linuxkpi/common/include/linux X-SVN-Commit-Revision: 361138 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 May 2020 20:09:11 -0000 Author: manu Date: Sun May 17 20:09:11 2020 New Revision: 361138 URL: https://svnweb.freebsd.org/changeset/base/361138 Log: linuxkpi: Add atomic_dec_and_mutex_lock This function decrement the counter and if the result is 0 it acquires the mutex and returns 1, if not it simply returns 0. Needed by DRM from Linux v5.3 Sponsored-by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D24847 Modified: head/sys/compat/linuxkpi/common/include/linux/mutex.h Modified: head/sys/compat/linuxkpi/common/include/linux/mutex.h ============================================================================== --- head/sys/compat/linuxkpi/common/include/linux/mutex.h Sun May 17 15:32:36 2020 (r361137) +++ head/sys/compat/linuxkpi/common/include/linux/mutex.h Sun May 17 20:09:11 2020 (r361138) @@ -37,6 +37,7 @@ #include #include +#include typedef struct mutex { struct sx sx; @@ -123,6 +124,16 @@ static inline bool mutex_is_owned(mutex_t *m) { return (sx_xlocked(&m->sx)); +} + +static inline int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *m) +{ + if (atomic_dec_and_test(cnt)) { + mutex_lock(m); + return (1); + } + + return (0); } #ifdef WITNESS_ALL