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: 11496847 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8848F81 for ; Sat, 18 Apr 2020 18:41:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D44F22244 for ; Sat, 18 Apr 2020 18:41:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="RZ4Q2VGM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727979AbgDRSlW (ORCPT ); Sat, 18 Apr 2020 14:41:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41190 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726086AbgDRSlR (ORCPT ); Sat, 18 Apr 2020 14:41:17 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87487C061A0F; Sat, 18 Apr 2020 11:41:17 -0700 (PDT) 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 Cc: Randy Dunlap , Linus Torvalds , Andrew Morton , Alexander Viro , linux-fsdevel@vger.kernel.org, Dmitry Torokhov , linux-input@vger.kernel.org, Jaroslav Kysela , Takashi Iwai , alsa-devel@alsa-project.org, Greg Kroah-Hartman , linux-usb@vger.kernel.org, "J. Bruce Fields" , Chuck Lever , linux-nfs@vger.kernel.org, Johannes Berg , Dan Williams , Vishal Verma , Dave Jiang , linux-nvdimm@lists.01.org, "Martin K. Petersen" , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, Zzy Wysm 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 Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org 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