From nobody Fri Apr 4 11:43:54 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 88ABF155382; Wed, 2 Apr 2025 21:59:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743631142; cv=none; b=lbksnjWWcd1KC5nB8BBk+d8qmWpZ2Ek6jDgS/gfxa2JWOktWbKjNDDGzaNMkFX5URUjfPHbxJu8Qhmo42jVUi9N64OrJ1RNYiJMsICxzeHgTKX9GUHhDo8NP9gpCc6lZ4XA3ZevuqNxyOdUc+eYDhLUfQMJD4HMVDm8plTzGtS8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743631142; c=relaxed/simple; bh=0BXP9Sttv9k8REO+ljfXfz32urOtrGdhguS+/WAW0jA=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=me7tUOUa9s0ihOjDssAbpffeOIRbH07VcKARtkz+Uo6oVEvyANunE9TzyAbLZooQOvM6Xwj6mFhh6JTgPkkb/Rpv7RlqFAh2Mn+AyatG6pxhZve+rEyOt3+BaCAfcpVVbOA2mSk+BaoHa40l6v9h/Xz90vPvoqGPqDe71BQINEQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hJJ3Qkza; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hJJ3Qkza" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31D46C4CEE7; Wed, 2 Apr 2025 21:59:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1743631142; bh=0BXP9Sttv9k8REO+ljfXfz32urOtrGdhguS+/WAW0jA=; h=Date:From:To:Cc:Subject:From; b=hJJ3QkzafMZCUvkyswDqA/xuoQh8r0ItuHa0MzoW9hLNxLeHxMNOLepDMEvRbuFjK dzXruQbPrWwfVhR5i7NbG4yFlAGY5DIPQVgjAHJs53QufguQk3K5e/09zZIAXh8FlH 40yg3pn5v2t2640k760GjlbyhPmc9LqTsgkjLb4LzjQUfeb7jJx7w+fpiyvzCIj3To JzDzg+uUg7aNOXzPWwxPqgmYgKCAcQVWmb8D7y2yMBGp5SKFKQwotMloIxi2yCNVr3 /4+gxZntVCiUCrgU87AxoAcxtc3aN81LwpQkffEgrkWk7QLx9mdEwmYb9NmbScgw+A m81lgmgcuhN6Q== Date: Wed, 2 Apr 2025 15:58:59 -0600 From: "Gustavo A. R. Silva" To: Lyude Paul , Danilo Krummrich , David Airlie , Simona Vetter Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH v2][next] drm/nouveau: disp: Avoid -Wflex-array-member-not-at-end warning Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" -Wflex-array-member-not-at-end was introduced in GCC-14, and we are getting ready to enable it, globally. Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of a flexible structure where the size of the flexible-array member is known at compile-time, and refactor the rest of the code, accordingly. So, with these changes, fix the following warning: drivers/gpu/drm/nouveau/dispnv50/disp.c:779:47: warning: structure containi= ng a flexible array member is not at the end of another structure [-Wflex-a= rray-member-not-at-end] Signed-off-by: Gustavo A. R. Silva --- Changes in v2: - Calculate the size of `data[]` using ` __struct_size(args) - sizeof(*arg= s)`. v1: - Link: https://lore.kernel.org/linux-hardening/ZsZLFS1CsHkKjw+C@elsanto/ drivers/gpu/drm/nouveau/dispnv50/disp.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouv= eau/dispnv50/disp.c index 504cb3f2054b..725331638a15 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -775,10 +775,8 @@ nv50_hdmi_enable(struct drm_encoder *encoder, struct n= ouveau_crtc *nv_crtc, union hdmi_infoframe infoframe =3D { 0 }; const u8 rekey =3D 56; /* binary driver, and tegra, constant */ u32 max_ac_packet; - struct { - struct nvif_outp_infoframe_v0 infoframe; - u8 data[17]; - } args =3D { 0 }; + DEFINE_RAW_FLEX(struct nvif_outp_infoframe_v0, args, data, 17); + const u8 data_len =3D __struct_size(args) - sizeof(*args); int ret, size; =20 max_ac_packet =3D mode->htotal - mode->hdisplay; @@ -815,29 +813,29 @@ nv50_hdmi_enable(struct drm_encoder *encoder, struct = nouveau_crtc *nv_crtc, return; =20 /* AVI InfoFrame. */ - args.infoframe.version =3D 0; - args.infoframe.head =3D nv_crtc->index; + args->version =3D 0; + args->head =3D nv_crtc->index; =20 if (!drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi, &nv_connect= or->base, mode)) { drm_hdmi_avi_infoframe_quant_range(&infoframe.avi, &nv_connector->base, = mode, HDMI_QUANTIZATION_RANGE_FULL); =20 - size =3D hdmi_infoframe_pack(&infoframe, args.data, ARRAY_SIZE(args.data= )); + size =3D hdmi_infoframe_pack(&infoframe, args->data, data_len); } else { size =3D 0; } =20 - nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_AVI, &args.= infoframe, size); + nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_AVI, args, = size); =20 /* Vendor InfoFrame. */ - memset(&args.data, 0, sizeof(args.data)); + memset(args->data, 0, data_len); if (!drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi, &nv_connector->base, mode)) - size =3D hdmi_infoframe_pack(&infoframe, args.data, ARRAY_SIZE(args.data= )); + size =3D hdmi_infoframe_pack(&infoframe, args->data, data_len); else size =3D 0; =20 - nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_VSI, &args.= infoframe, size); + nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_VSI, args, = size); =20 nv_encoder->hdmi.enabled =3D true; } --=20 2.43.0