From patchwork Fri Jan 24 09:28:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 232983 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, 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 9A485C2D0DB for ; Fri, 24 Jan 2020 11:18:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6DB8B20708 for ; Fri, 24 Jan 2020 11:18:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864706; bh=fC/MRy4I5s/5whQtukBou7lee2The/bxlAVOItkFP68=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=i4WN+L6mbBRLAzQCuaU5Qh6qLUug5YJDiVK51AJBhLHd0/YZopd9PtmE1TE0CQH1Z petJ+/H9kOI0PjNegpPRDha6aLoUQlJq/K297lylzTMDNaopxRdajLHpFJXmqza0Pe Mqnsm0lU6QM98E1FqYOUGmi7Y0Y/G3h3bPsxNEZs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390634AbgAXLSX (ORCPT ); Fri, 24 Jan 2020 06:18:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:55460 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390415AbgAXLSW (ORCPT ); Fri, 24 Jan 2020 06:18:22 -0500 Received: from localhost (ip-213-127-102-57.ip.prioritytelecom.net [213.127.102.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C9C8620704; Fri, 24 Jan 2020 11:18:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864701; bh=fC/MRy4I5s/5whQtukBou7lee2The/bxlAVOItkFP68=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rWNgbuTydMM1joKMP/QxM/Okm4jGaFV4kBNhx+OUQ+dvh07if3qNx36Mxt/zy3Gd6 fBaSpL8ie2mXrug178EE700h6PQ6KctCfHQ+LGHZLjHGBDuEzSpFWZG7DhjHy8poHD 2ZKu5lSWu+mc9kxflU6ckHndFd3DnNM+baXX70tY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arnd Bergmann , Suzuki K Poulose , Mathieu Poirier , Sasha Levin Subject: [PATCH 4.19 328/639] coresight: catu: fix clang build warning Date: Fri, 24 Jan 2020 10:28:18 +0100 Message-Id: <20200124093128.204839983@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124093047.008739095@linuxfoundation.org> References: <20200124093047.008739095@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Arnd Bergmann [ Upstream commit 59d63de076607a9334b11628b5c3ddda1d8f56cd ] Clang points out a syntax error, as the etr_catu_buf_ops structure is declared 'static' before the type is known: In file included from drivers/hwtracing/coresight/coresight-tmc-etr.c:12: drivers/hwtracing/coresight/coresight-catu.h:116:40: warning: tentative definition of variable with internal linkage has incomplete non-array type 'const struct etr_buf_operations' [-Wtentative-definition-incomplete-type] static const struct etr_buf_operations etr_catu_buf_ops; ^ drivers/hwtracing/coresight/coresight-catu.h:116:21: note: forward declaration of 'struct etr_buf_operations' static const struct etr_buf_operations etr_catu_buf_ops; This seems worth fixing in the code, so replace pointer to the empty constant structure with a NULL pointer. We need an extra NULL pointer check here, but the result should be better object code otherwise, avoiding the silly empty structure. Fixes: 434d611cddef ("coresight: catu: Plug in CATU as a backend for ETR buffer") Signed-off-by: Arnd Bergmann Reviewed-by: Suzuki K Poulose [Fixed line over 80 characters] Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/hwtracing/coresight/coresight-catu.h | 5 ----- drivers/hwtracing/coresight/coresight-tmc-etr.c | 5 +++-- 2 files changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h index 1b281f0dcccca..1d2ad183fd92d 100644 --- a/drivers/hwtracing/coresight/coresight-catu.h +++ b/drivers/hwtracing/coresight/coresight-catu.h @@ -109,11 +109,6 @@ static inline bool coresight_is_catu_device(struct coresight_device *csdev) return true; } -#ifdef CONFIG_CORESIGHT_CATU extern const struct etr_buf_operations etr_catu_buf_ops; -#else -/* Dummy declaration for the CATU ops */ -static const struct etr_buf_operations etr_catu_buf_ops; -#endif #endif diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 2d6f428176ff8..3b684687b5a7d 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -747,7 +747,8 @@ static inline void tmc_etr_disable_catu(struct tmc_drvdata *drvdata) static const struct etr_buf_operations *etr_buf_ops[] = { [ETR_MODE_FLAT] = &etr_flat_buf_ops, [ETR_MODE_ETR_SG] = &etr_sg_buf_ops, - [ETR_MODE_CATU] = &etr_catu_buf_ops, + [ETR_MODE_CATU] = IS_ENABLED(CONFIG_CORESIGHT_CATU) + ? &etr_catu_buf_ops : NULL, }; static inline int tmc_etr_mode_alloc_buf(int mode, @@ -761,7 +762,7 @@ static inline int tmc_etr_mode_alloc_buf(int mode, case ETR_MODE_FLAT: case ETR_MODE_ETR_SG: case ETR_MODE_CATU: - if (etr_buf_ops[mode]->alloc) + if (etr_buf_ops[mode] && etr_buf_ops[mode]->alloc) rc = etr_buf_ops[mode]->alloc(drvdata, etr_buf, node, pages); if (!rc)