From owner-svn-src-vendor@freebsd.org Fri Sep 1 18:02:54 2017 Return-Path: Delivered-To: svn-src-vendor@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C53D1E1E7ED; Fri, 1 Sep 2017 18:02:54 +0000 (UTC) (envelope-from avg@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 mx1.freebsd.org (Postfix) with ESMTPS id 9BF95825F3; Fri, 1 Sep 2017 18:02:54 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v81I2rd2037568; Fri, 1 Sep 2017 18:02:53 GMT (envelope-from avg@FreeBSD.org) Received: (from avg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v81I2rbt037567; Fri, 1 Sep 2017 18:02:53 GMT (envelope-from avg@FreeBSD.org) Message-Id: <201709011802.v81I2rbt037567@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: avg set sender to avg@FreeBSD.org using -f From: Andriy Gapon Date: Fri, 1 Sep 2017 18:02:53 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r323111 - vendor-sys/illumos/dist/uts/common/fs/zfs X-SVN-Group: vendor-sys X-SVN-Commit-Author: avg X-SVN-Commit-Paths: vendor-sys/illumos/dist/uts/common/fs/zfs X-SVN-Commit-Revision: 323111 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-vendor@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the vendor work area tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Sep 2017 18:02:54 -0000 Author: avg Date: Fri Sep 1 18:02:53 2017 New Revision: 323111 URL: https://svnweb.freebsd.org/changeset/base/323111 Log: 8569 problem with inline functions in abd.h illumos/illumos-gate@37e84ab74e939caf52150fc3352081786ecc0c29 https://github.com/illumos/illumos-gate/commit/37e84ab74e939caf52150fc3352081786ecc0c29 https://www.illumos.org/issues/8569 C [C99] has peculiar rules for inline functions that are different from the C++ rules. Unlike C++ where inline is "fire and forget", in C a programmer must pay attention to the function's storage class / visibility. The main problem is with the case where a compiler decides to not inline a call to the function declared as inline. Some relevant links: - http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka15831.html - http://www.drdobbs.com/the-new-c-inline-functions/184401540 The summary is that either the inline functions should be declared 'static inline' or one of the compilation units (.c files) must provide a callable externally visible function definition. In the former case, the compiler would automatically create a local non-inlined function instance in every compilation unit where it's needed. In the latter case the single external definition is used to satisfy any non-inlined calls in all compilation units. As things stand right now, we can get an undefined reference error under certain combinations of compilers and compiler options. For example, this is what I get on FreeBSD when compiling with clang 4.0.0 and -O1: In function `abd_free': /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c:385: undefined reference to `abd_is_linear' So, there are two alternatives. Either to qualify each inline function in abd.h with static storage class. Or to add declarations like the following to abd.c: extern inline boolean_t abd_is_linear(abd_t *abd); Both work. I am not sure which one would be more consistent with the illumos development rules. Reviewed by: Matt Ahrens Approved by: Robert Mustacchi Author: Andriy Gapon Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/abd.c Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/abd.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/abd.c Fri Sep 1 17:57:51 2017 (r323110) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/abd.c Fri Sep 1 18:02:53 2017 (r323111) @@ -157,6 +157,13 @@ extern vmem_t *zio_alloc_arena; kmem_cache_t *abd_chunk_cache; static kstat_t *abd_ksp; +extern inline boolean_t abd_is_linear(abd_t *abd); +extern inline void abd_copy(abd_t *dabd, abd_t *sabd, size_t size); +extern inline void abd_copy_from_buf(abd_t *abd, const void *buf, size_t size); +extern inline void abd_copy_to_buf(void* buf, abd_t *abd, size_t size); +extern inline int abd_cmp_buf(abd_t *abd, const void *buf, size_t size); +extern inline void abd_zero(abd_t *abd, size_t size); + static void * abd_alloc_chunk() {