From patchwork Sat Apr 18 18:41:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Randy Dunlap X-Patchwork-Id: 192972 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBBCFC352BE for ; Sat, 18 Apr 2020 18:46:45 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4356F22209 for ; Sat, 18 Apr 2020 18:46:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="sNNmjkGh"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="RZ4Q2VGM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4356F22209 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 8F4261680; Sat, 18 Apr 2020 20:45:53 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 8F4261680 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1587235603; bh=6l+z9h+fyHhIrvgIcJDDwXMG/kVpkTM1CGga7dCXfKQ=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=sNNmjkGh2M2EE9rZffSbUXaY39i4J+qa9pF5rpeiYNfq3KkznMPuhvOm/Mt5NKLAJ Oom3Rv6Jncm95GIYAk42IDyimGl9JImQdDxQFmb+oHWyXnNRowqXNGwEJ5O5cNOAnA IIHm/d+TvHWJ614Ekojf0RDLKeCYNelV+cf9o2Rs= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 54CBEF802C3; Sat, 18 Apr 2020 20:41:56 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 4E5FAF8014E; Sat, 18 Apr 2020 20:41:42 +0200 (CEST) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 61E92F8013D for ; Sat, 18 Apr 2020 20:41:26 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 61E92F8013D Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="RZ4Q2VGM" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Sender:Reply-To:Content-ID:Content-Description; bh=g1ONOf6MGj3aToaUeBLhJbF3d+tY5CMeHHoXTtmPNsE=; b=RZ4Q2VGMoE1Bka/a+kMpugnl6V WMVry8MWAMKA0AfBSRZP5GbN9pJJeG4gjR6sud7qBmDPy8K3i6BprqmwPWH5lOuW2gqRr/Z6Cm0gD LgdYYpcS7u+9zN1adQU6TRExKq4DBbaLs/fZ8BFQwxY4cbSn3IER0BNxv3UJFdqify3T+1KdTD2Qi vrHfuHPH4Z0QFf2MXKCGJ5k6d3bNzMgrjkWWTemljZSz/KV2Pcv1AoZFf0+EUry4IuzRrudoMMT/C ei8L5wfK4u7V/ulhuTnRRFf6mMeS0g5tdTHkmzzebQf9iIBlwwM0f/XqpVSnBSOE3/pCfTfbCtZ3f SvwQIVLw==; Received: from [2601:1c0:6280:3f0::19c2] (helo=smtpauth.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jPsOw-0007rZ-8d; Sat, 18 Apr 2020 18:41:14 +0000 From: Randy Dunlap To: linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/9] kernel.h: add do_empty() macro Date: Sat, 18 Apr 2020 11:41:03 -0700 Message-Id: <20200418184111.13401-2-rdunlap@infradead.org> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200418184111.13401-1-rdunlap@infradead.org> References: <20200418184111.13401-1-rdunlap@infradead.org> MIME-Version: 1.0 Cc: alsa-devel@alsa-project.org, Randy Dunlap , Zzy Wysm , "J. Bruce Fields" , target-devel@vger.kernel.org, Dave Jiang , linux-scsi@vger.kernel.org, linux-nvdimm@lists.01.org, Vishal Verma , Chuck Lever , linux-input@vger.kernel.org, Alexander Viro , Dan Williams , Andrew Morton , linux-nfs@vger.kernel.org, "Martin K. Petersen" , Greg Kroah-Hartman , Dmitry Torokhov , Takashi Iwai , linux-usb@vger.kernel.org, linux-fsdevel@vger.kernel.org, Johannes Berg , Linus Torvalds X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Add the do_empty() macro to silence gcc warnings about an empty body following an "if" statement when -Wextra is used. However, for debug printk calls that are being disabled, use either no_printk() or pr_debug() [and optionally dynamic printk debugging] instead. Signed-off-by: Randy Dunlap Cc: Linus Torvalds Cc: Andrew Morton Cc: Alexander Viro Cc: linux-fsdevel@vger.kernel.org Cc: Dmitry Torokhov Cc: linux-input@vger.kernel.org Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: alsa-devel@alsa-project.org Cc: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org Cc: "J. Bruce Fields" Cc: Chuck Lever Cc: linux-nfs@vger.kernel.org Cc: Johannes Berg Cc: Dan Williams Cc: Vishal Verma Cc: Dave Jiang Cc: linux-nvdimm@lists.01.org Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Cc: target-devel@vger.kernel.org Cc: Zzy Wysm --- include/linux/kernel.h | 8 ++++++++ 1 file changed, 8 insertions(+) --- linux-next-20200327.orig/include/linux/kernel.h +++ linux-next-20200327/include/linux/kernel.h @@ -40,6 +40,14 @@ #define READ 0 #define WRITE 1 +/* + * When using -Wextra, an "if" statement followed by an empty block + * (containing only a ';'), produces a warning from gcc: + * warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body] + * Replace the empty body with do_empty() to silence this warning. + */ +#define do_empty() do { } while (0) + /** * ARRAY_SIZE - get the number of elements in array @arr * @arr: array to be sized