From patchwork Sat May 16 02:35:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 11553237 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 42D48138A for ; Sat, 16 May 2020 02:36:09 +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 17EA420671 for ; Sat, 16 May 2020 02:36:08 +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="aGmFPqdu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 17EA420671 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 77B6C6ED23; Sat, 16 May 2020 02:36:06 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-oi1-x243.google.com (mail-oi1-x243.google.com [IPv6:2607:f8b0:4864:20::243]) by gabe.freedesktop.org (Postfix) with ESMTPS id BDADC6ED21; Sat, 16 May 2020 02:36:04 +0000 (UTC) Received: by mail-oi1-x243.google.com with SMTP id s198so4075957oie.6; Fri, 15 May 2020 19:36:04 -0700 (PDT) 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=KPeuzuHEDvzwNnkRCqowgBAU6EUQ7TCPeetBb+t1Bdo=; b=aGmFPqdutHEPouBg3Si9ID8mt8l+QV684XJPaZrlFTWA7mam49jOuR0mXI2jOavU8z lrkl20RBQ0BVaopc7Yb3YJqEUcJnp3ShFPF6HjwKi31C1ZqciisHIWuGF6Nu0c+75mKx nMNYULyB0bTOEw/EAx5Pn3EMUZcEUwXjbJ0GomitQYbc73J0qApYBwf+gQz8ygkF3Au8 n2/uk/gL2wQJ0KDNbbGonwu02NtWBXva+NKSKSZG5MBrVFEV+AwhLGzJc3/DfDWTkYCQ eCPhu6V+nHt37Ub/Yy+Zpwcoki+EAfgTtg8e23OWIlxwNPpAUjWZlInl31PJ1r8H/tuU Ch6Q== 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=KPeuzuHEDvzwNnkRCqowgBAU6EUQ7TCPeetBb+t1Bdo=; b=ugLgTqVELb8HKNrtoqWmpKJjeTA4rJBhkG/LIzEBHkmX0k1VjLEg3Vg72qKGa2rTM0 BMyMR3NRrLmgjwsAFIBvgV1zD8VqJM7+HKZo+0j9DIKsliKxxNvcI/QHgNmWF/jQsX/H hupxF+fa4hfl2bHOYHNUt5+mfLrdYCvboMiLvMxn531uO2AYKB5OMI9gzHRll6cXh1oV IexujLj7zC4WQfML/vc1qOJNONfwvQh1DVls0iANwS0f0wjCqLo2tUZOpxmI81/JzFoU RoERFwWrCFVT13cWm36E2E/xvcl7A3hQY3bGl5PzoG6iM/xdS56ExyNMhFqJDq4MrSLL Upuw== X-Gm-Message-State: AOAM533dx7ZeUEQpWGL0nhvb4BVTGcvW1sdSxEgRObm7HZaq4t/Sekfp GL+xFghZtIvP3Hax91cNp7s= X-Google-Smtp-Source: ABdhPJy47Nsv2i4H/OPmjeTG+IFTltW99Dl2+E64qa4UnzF9iYY27a+pUPAga7zdZ/0Ztw3+0h5YWA== X-Received: by 2002:aca:908:: with SMTP id 8mr4438837oij.170.1589596563884; Fri, 15 May 2020 19:36:03 -0700 (PDT) Received: from localhost.localdomain ([2604:1380:4111:8b00::1]) by smtp.gmail.com with ESMTPSA id t15sm1112821oov.32.2020.05.15.19.36.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 May 2020 19:36:03 -0700 (PDT) From: Nathan Chancellor To: Zhenyu Wang , Zhi Wang , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi Date: Fri, 15 May 2020 19:35:45 -0700 Message-Id: <20200516023545.3332334-1-natechancellor@gmail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-Patchwork-Bot: notify Subject: [Intel-gfx] [PATCH] drm/i915: Mark check_shadow_context_ppgtt as maybe unused 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: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, clang-built-linux@googlegroups.com, Nathan Chancellor , intel-gvt-dev@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" When CONFIG_DRM_I915_DEBUG_GEM is not set, clang warns: drivers/gpu/drm/i915/gvt/scheduler.c:884:1: warning: function 'check_shadow_context_ppgtt' is not needed and will not be emitted [-Wunneeded-internal-declaration] check_shadow_context_ppgtt(struct execlist_ring_context *c, struct intel_vgpu_mm *m) ^ 1 warning generated. This warning is similar to -Wunused-function but rather than warning that the function is completely unused, it warns that it is used in some expression within the file but that expression will be evaluated to a constant or be optimized away in the final assembly, essentially making it appeared used but really isn't. Usually, this happens when a function or variable is only used in sizeof, where it will appear to be used but will be evaluated at compile time and not be required to be emitted. In this case, the function is only used in GEM_BUG_ON, which is defined as BUILD_BUG_ON_INVALID, which intentionally follows this pattern. To fix this warning, add __maybe_unused to make it clear that this is intentional depending on the configuration. Fixes: bec3df930fbd ("drm/i915/gvt: Support PPGTT table load command") Link: https://github.com/ClangBuiltLinux/linux/issues/1027 Signed-off-by: Nathan Chancellor Acked-by: Zhenyu Wang --- drivers/gpu/drm/i915/gvt/scheduler.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: bdecf38f228bcca73b31ada98b5b7ba1215eb9c9 diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c index f776c92de8d7..0fb1df71c637 100644 --- a/drivers/gpu/drm/i915/gvt/scheduler.c +++ b/drivers/gpu/drm/i915/gvt/scheduler.c @@ -880,7 +880,7 @@ static void update_guest_pdps(struct intel_vgpu *vgpu, gpa + i * 8, &pdp[7 - i], 4); } -static bool +static __maybe_unused bool check_shadow_context_ppgtt(struct execlist_ring_context *c, struct intel_vgpu_mm *m) { if (m->ppgtt_mm.root_entry_type == GTT_TYPE_PPGTT_ROOT_L4_ENTRY) {