From nobody Sun May 5 05:51:09 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1608031759; cv=none; d=zohomail.com; s=zohoarc; b=evDTJtsqS323Vmsz6ReXsPkO6NpAfGtUT8bOecqX1ygB0rqQyrskokXIjpJLdNuuIFi3BKu/XGdVSfLg1NtFIFptsQ8E1ZyyeSCcsz80AT3qa80uijyZD9JzBRQOJCjMZ4zaQILvdy8rvXixUsI0/u0e22YQUEdhTVS3X7OyUQQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1608031759; h=Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:Message-ID:Sender:Subject:To; bh=sB/iBnj0bJve+Wg4G7UTvwAVqmPKendEle03M+qjOgU=; b=BXyleCj7v7v0BWcNoF3Rfy7zihfLewK9ZwFs2eZmTmNVO/ZzJVR0vUtI1xFKdLAKtZsk7MSt6aQ9Md7yre/K3mOlwFK3t2g6PX8ZtSU4bLhaBcesQ/E0Jgz0YMBfi2S3rrVF/kdHRksbKnfWvJM+4NZzvb8b8RnlhY6PVWCjHbE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1608031759195422.5355894248736; Tue, 15 Dec 2020 03:29:19 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.53076.92609 (Exim 4.92) (envelope-from ) id 1kp8TC-00074x-4z; Tue, 15 Dec 2020 11:26:18 +0000 Received: by outflank-mailman (output) from mailman id 53076.92609; Tue, 15 Dec 2020 11:26:18 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kp8TC-00074q-1w; Tue, 15 Dec 2020 11:26:18 +0000 Received: by outflank-mailman (input) for mailman id 53076; Tue, 15 Dec 2020 11:26:17 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kp8TA-00074l-Vz for xen-devel@lists.xenproject.org; Tue, 15 Dec 2020 11:26:17 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kp8T9-0004m3-FH; Tue, 15 Dec 2020 11:26:15 +0000 Received: from 54-240-197-235.amazon.com ([54.240.197.235] helo=ufe34d9ed68d054.ant.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kp8T9-0001LQ-3h; Tue, 15 Dec 2020 11:26:15 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Message-Id:Date:Subject:Cc:To:From; bh=sB/iBnj0bJve+Wg4G7UTvwAVqmPKendEle03M+qjOgU=; b=Ah/gYRk7Gh0WQvkJ/ew6otrLIp qOBaS8XDJjypfsCXaZgll5zJAkMdhICrix/KcW1jlxgi2FtpmIXZnbve7ph4wx3bHyV03yazQgSyn xLf5bavMizsqLEbKxyuOoZztNOYzYsBTwfdsQGyFv5FoIQhPi6oyS/L3ppYJFOC7mCJE=; From: Julien Grall To: xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, Rahul.Singh@arm.com, Julien Grall , Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu Subject: [PATCH] xen: Rework WARN_ON() to return whether a warning was triggered Date: Tue, 15 Dec 2020 11:26:10 +0000 Message-Id: <20201215112610.1986-1-julien@xen.org> X-Mailer: git-send-email 2.17.1 X-ZohoMail-DKIM: pass (identity @xen.org) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Julien Grall So far, our implementation of WARN_ON() cannot be used in the following situation: if ( WARN_ON() ) ... This is because the WARN_ON() doesn't return whether a warning. Such construction can be handy to have if you have to print more information and now the stack track. Rework the WARN_ON() implementation to return whether a warning was triggered. The idea was borrowed from Linux. Signed-off-by: Julien Grall Reviewed-by: Bertrand Marquis Reviewed-by: Juergen Gross --- This will be used in the SMMUv3 driver (see [1]). --- xen/include/xen/lib.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/xen/include/xen/lib.h b/xen/include/xen/lib.h index a9679c913d5c..d10c68aa3c07 100644 --- a/xen/include/xen/lib.h +++ b/xen/include/xen/lib.h @@ -23,7 +23,13 @@ #include =20 #define BUG_ON(p) do { if (unlikely(p)) BUG(); } while (0) -#define WARN_ON(p) do { if (unlikely(p)) WARN(); } while (0) +#define WARN_ON(p) ({ \ + bool __ret_warn_on =3D (p); \ + \ + if ( unlikely(__ret_warn_on) ) \ + WARN(); \ + unlikely(__ret_warn_on); \ +}) =20 /* All clang versions supported by Xen have _Static_assert. */ #if defined(__clang__) || \ --=20 2.17.1