From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-6.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gnuweeb.org (Postfix) with ESMTPS id CE6487E3F2 for ; Tue, 19 Apr 2022 00:42:31 +0000 (UTC) Authentication-Results: gnuweeb.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=QkTirV9s; dkim-atps=neutral Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A4A62614A2; Tue, 19 Apr 2022 00:42:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A7A36C36AE9; Tue, 19 Apr 2022 00:42:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1650328948; bh=3FXQ32nSYAhkONYRR8LBpPari/rW5ikRtvS6E1okCoQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QkTirV9sFtf9VVLJ6cIZQctJ1H2M7H4swyK+3jGrzRiEIznh3PhULCAR0H3cwbV1E jXF4jhinu+h/LeCeFjGfn8riw1WdkiqGhv/8gAHuS/UA3XH6LrH0tRmgCA8vlBRgE0 ai27XDluI7csc4/Hc4ZLh9GHiP3AQWoKfS8EHhsSFZyoOzbbbn84Z0pjt0qWst4c13 wfkFloQZzbk0d8iACUH6FmKO/eZfiin9BIvs8LGadZ2kG1QH/lIvt6Ap6ClLcTF4A7 JjHW2ROwzkSqmLIKoYqgWmVX72v9d7QPHfXju8mwWNpo0g764II8qT6aG8vPTGxoa2 M0jk6XdXausXQ== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 722175C04BD; Mon, 18 Apr 2022 17:42:27 -0700 (PDT) From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: gwml@vger.gnuweeb.org, kernel-team@fb.com, w@lwt.eu, Ammar Faizi , Willy Tarreau , "Paul E . McKenney" Subject: [PATCH nolibc 58/61] tools/nolibc/types: Implement `offsetof()` and `container_of()` macro Date: Mon, 18 Apr 2022 17:42:22 -0700 Message-Id: <20220419004225.3952530-58-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20220419004219.GA3952301@paulmck-ThinkPad-P17-Gen-1> References: <20220419004219.GA3952301@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit List-Id: From: Ammar Faizi Implement `offsetof()` and `container_of()` macro. The first use case of these macros is for `malloc()`, `realloc()` and `free()`. Acked-by: Willy Tarreau Signed-off-by: Ammar Faizi Signed-off-by: Paul E. McKenney --- tools/include/nolibc/types.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h index 357e60ad38a8..959997034e55 100644 --- a/tools/include/nolibc/types.h +++ b/tools/include/nolibc/types.h @@ -191,4 +191,15 @@ struct stat { #define major(dev) ((unsigned int)(((dev) >> 8) & 0xfff)) #define minor(dev) ((unsigned int)(((dev) & 0xff)) +#ifndef offsetof +#define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD) +#endif + +#ifndef container_of +#define container_of(PTR, TYPE, FIELD) ({ \ + __typeof__(((TYPE *)0)->FIELD) *__FIELD_PTR = (PTR); \ + (TYPE *)((char *) __FIELD_PTR - offsetof(TYPE, FIELD)); \ +}) +#endif + #endif /* _NOLIBC_TYPES_H */ -- 2.31.1.189.g2e36527f23