From patchwork Mon Mar 22 16:02:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12155393 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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 14A88C433EB for ; Mon, 22 Mar 2021 16:07:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0049E619B7 for ; Mon, 22 Mar 2021 16:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232002AbhCVQGo (ORCPT ); Mon, 22 Mar 2021 12:06:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:53216 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230499AbhCVQFa (ORCPT ); Mon, 22 Mar 2021 12:05:30 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9E526619B3; Mon, 22 Mar 2021 16:05:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616429130; bh=Cz6Ib/Jy2MCBRG3RkrW7YxIgzj/6kEv+v4DuuyruVdM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YmX1KQkIWDTM9oL9SIaizhQuXBgId2TgjaOHRvpRa8ujB1Hj1aOwCgrCrMNJVi2gq P8VgokfOwAmfnYZLX1rsRk4pLvkeDX2bspNuX1VYi25/JXoxXtnn7F2MgFWC0FsAFu N+uQuJ3Me21QeU0KrCs4aFbaBIGeJwlctHwPj1pA51MBMY2ra+UvbFh+zl+P+BsSj9 1ElKemq6Wxa1TUdo/FGf/LywTMYZxZt3573Q+qI3GKdCXVd48krzSZHquQETNI++01 tCB8r6B7NO2iohCFFlGopnfYJGFYOD5rOpt+nJhCejnPW+cx72ztkTHm7tbHkrEoPf S1/KeKBMSo8Ag== From: Arnd Bergmann To: linux-kernel@vger.kernel.org, Martin Sebor , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter Cc: Arnd Bergmann , x86@kernel.org, Ning Sun , Kalle Valo , Simon Kelley , James Smart , "James E.J. Bottomley" , Anders Larsen , Tejun Heo , Serge Hallyn , Imre Deak , linux-arm-kernel@lists.infradead.org, tboot-devel@lists.sourceforge.net, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ath11k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-scsi@vger.kernel.org, cgroups@vger.kernel.org, linux-security-module@vger.kernel.org, Chris Wilson , =?utf-8?q?Jos=C3=A9_Roberto_de_Sou?= =?utf-8?q?za?= , =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , Matt Roper , Aditya Swarup Subject: [PATCH 10/11] drm/i915: avoid stringop-overread warning on pri_latency Date: Mon, 22 Mar 2021 17:02:48 +0100 Message-Id: <20210322160253.4032422-11-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210322160253.4032422-1-arnd@kernel.org> References: <20210322160253.4032422-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: From: Arnd Bergmann gcc-11 warns about what appears to be an out-of-range array access: In function ‘snb_wm_latency_quirk’, inlined from ‘ilk_setup_wm_latency’ at drivers/gpu/drm/i915/intel_pm.c:3108:3: drivers/gpu/drm/i915/intel_pm.c:3057:9: error: ‘intel_print_wm_latency’ reading 16 bytes from a region of size 10 [-Werror=stringop-overread] 3057 | intel_print_wm_latency(dev_priv, "Primary", dev_priv->wm.pri_latency); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/intel_pm.c: In function ‘ilk_setup_wm_latency’: drivers/gpu/drm/i915/intel_pm.c:3057:9: note: referencing argument 3 of type ‘const u16 *’ {aka ‘const short unsigned int *’} drivers/gpu/drm/i915/intel_pm.c:2994:13: note: in a call to function ‘intel_print_wm_latency’ 2994 | static void intel_print_wm_latency(struct drm_i915_private *dev_priv, | ^~~~~~~~~~~~~~~~~~~~~~ My guess is that this code is actually safe because the size of the array depends on the hardware generation, and the function checks for that, but at the same time I would not expect the compiler to work it out correctly, and the code seems a little fragile with regards to future changes. Simply increasing the size of the array should help. Signed-off-by: Arnd Bergmann Reviewed-by: Jani Nikula --- drivers/gpu/drm/i915/i915_drv.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 26d69d06aa6d..3567602e0a35 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1095,11 +1095,11 @@ struct drm_i915_private { * in 0.5us units for WM1+. */ /* primary */ - u16 pri_latency[5]; + u16 pri_latency[8]; /* sprite */ - u16 spr_latency[5]; + u16 spr_latency[8]; /* cursor */ - u16 cur_latency[5]; + u16 cur_latency[8]; /* * Raw watermark memory latency values * for SKL for all 8 levels