From patchwork Tue Feb 11 05:08:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 11374817 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 D28DE14B4 for ; Tue, 11 Feb 2020 05:08:38 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 A5451206D7 for ; Tue, 11 Feb 2020 05:08:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="q19RtMc0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A5451206D7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 42F9C6E2B2; Tue, 11 Feb 2020 05:08:36 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-ot1-x342.google.com (mail-ot1-x342.google.com [IPv6:2607:f8b0:4864:20::342]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2A1556E2B2; Tue, 11 Feb 2020 05:08:35 +0000 (UTC) Received: by mail-ot1-x342.google.com with SMTP id b18so8909306otp.0; Mon, 10 Feb 2020 21:08:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=PzVeAyFZDO+woAn09FRMNrkoa0zSne0dLCKhCXRtKF4=; b=q19RtMc0tzaSrg/nVN9T+kDTIgE8GoGHNomGjMNGenUlgmowB17Sqh3zey54f8gwwm BR4NEdvdNkRA2Bt8im+h0tZV4M0sHqG14O8zHW8GXGcY92EGJPUwcoRKNQT+o8GOviIq vSQXanqPppwaTlPZXXu5SEGn0NtNXBd8lw6KA9PnfTiDeQbt/jgLtEfkoQJjF8NWBhUi qhW6ZBmXY3R4d2N2H+odyUXA49/16Rp7mZZVYqyMLKBYZaORunQcif9aVgEHiihUbOYV co150RBv41MIHzSY/ynkVRopA+Dxyr5mWI/fMf+GbykRcpD+ZWO2oE5EIWQKAq927rNS fWiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=PzVeAyFZDO+woAn09FRMNrkoa0zSne0dLCKhCXRtKF4=; b=fam5O6P0aX0Z5afjqHnkleEUkGSAc7nV79mwhp6L5Xn3gqXzcNFZIX+5jjeLhm0Ms5 vLFNdZcY5/kjbPlVfCMYc4Psfb5GrG2ZjDxUifplQQfyoOKJMGrfk+hhnxbCMKmMBx1N MnFATIPfoijTnKYyIZ8etlXiLfkPHRUqel6Qp3bCwN9saM/8obbmtUF7x6M2xfWn5+lg TOMnWNdIfHVha+D2TLJFpIAklF8I7uxJ5RFDMuUnQmY2OmeHccdiaQnzmWlfJcw7OTK4 qW6UKgP7/f6Dcf3qXokkZsxpj5cApeoSJQiw029X+6mkGJRVFliO6qc4acDf09QMhbUJ HecA== X-Gm-Message-State: APjAAAXnwertwLHvyyGKbdGcUZmLBxeeeLntmmsiJlfu7I4PazPYaM5n h39s1vF/eARzatvKrMXBJVA= X-Google-Smtp-Source: APXvYqxlNclpViNWlqwt0+vIhDKhok/SwQafMKa1noHdmqFLH9wDIUn22rZ/pJ6WKGHUhsnqLaXwGg== X-Received: by 2002:a05:6830:1e37:: with SMTP id t23mr3936686otr.16.1581397714034; Mon, 10 Feb 2020 21:08:34 -0800 (PST) Received: from localhost.localdomain ([2604:1380:4111:8b00::1]) by smtp.gmail.com with ESMTPSA id d11sm862015otl.31.2020.02.10.21.08.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Feb 2020 21:08:33 -0800 (PST) From: Nathan Chancellor To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi Date: Mon, 10 Feb 2020 22:08:08 -0700 Message-Id: <20200211050808.29463-1-natechancellor@gmail.com> X-Mailer: git-send-email 2.25.0 MIME-Version: 1.0 X-Patchwork-Bot: notify Subject: [Intel-gfx] [PATCH] drm/i915: Disable -Wtautological-constant-out-of-range-compare X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nathan Chancellor , clang-built-linux@googlegroups.com, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" A recent commit in clang added -Wtautological-compare to -Wall, which is enabled for i915 so we see the following warning: ../drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:1485:22: warning: result of comparison of constant 576460752303423487 with expression of type 'unsigned int' is always false [-Wtautological-constant-out-of-range-compare] if (unlikely(remain > N_RELOC(ULONG_MAX))) ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ This warning only happens on x86_64 but that check is relevant for 32-bit x86 so we cannot remove it. -Wtautological-compare on a whole has good warnings but this one is not really relevant for the kernel because of all of the different configurations that are used to build the kernel. When -Wtautological-compare is enabled for the kernel, this option will remain disabled so do that for i915 now. Link: https://github.com/ClangBuiltLinux/linux/issues/778 Signed-off-by: Nathan Chancellor --- drivers/gpu/drm/i915/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 38df01c23176..55dbcca179c7 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -21,6 +21,7 @@ subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable) subdir-ccflags-y += $(call cc-disable-warning, sign-compare) subdir-ccflags-y += $(call cc-disable-warning, sometimes-uninitialized) subdir-ccflags-y += $(call cc-disable-warning, initializer-overrides) +subdir-ccflags-y += $(call cc-disable-warning, tautological-constant-out-of-range-compare) subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror # Fine grained warnings disable