From nobody Wed Dec 17 12:44:22 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 305D8EE4993 for ; Sun, 20 Aug 2023 12:38:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230225AbjHTMiw (ORCPT ); Sun, 20 Aug 2023 08:38:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231136AbjHTMis (ORCPT ); Sun, 20 Aug 2023 08:38:48 -0400 Received: from wxsgout04.xfusion.com (wxsgout04.xfusion.com [36.139.87.180]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4534E30DA for ; Sun, 20 Aug 2023 05:36:52 -0700 (PDT) Received: from wuxshcsitd00600.xfusion.com (unknown [10.32.133.213]) by wxsgout04.xfusion.com (SkyGuard) with ESMTPS id 4RTFSV37CMz9v7dp; Sun, 20 Aug 2023 20:35:22 +0800 (CST) Received: from localhost (10.82.147.3) by wuxshcsitd00600.xfusion.com (10.32.133.213) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Sun, 20 Aug 2023 20:36:46 +0800 Date: Sun, 20 Aug 2023 20:36:45 +0800 From: Wang Jinchao To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter , , , CC: Subject: [Intel-gfx] [PATCH v3] drm/i915: Fix Kconfig error for CONFIG_DRM_I915 Message-ID: Reply-To: MIME-Version: 1.0 Content-Disposition: inline X-Originating-IP: [10.82.147.3] X-ClientProxiedBy: wuxshcsitd00601.xfusion.com (10.32.135.241) To wuxshcsitd00600.xfusion.com (10.32.133.213) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When CONFIG_DRM_I915 is set to 'y' and CONFIG_BACKLIGHT_CLASS_DEVICE is set to 'm', we encountered an ld.lld error during the build process: ld.lld: error: undefined symbol: backlight_device_get_by_name >>> referenced by intel_backlight.c:955 >>> vmlinux.o:(intel_backlight_device_register) ld.lld: error: undefined symbol: backlight_device_register >>> referenced by intel_backlight.c:971 >>> vmlinux.o:(intel_backlight_device_register) ld.lld: error: undefined symbol: backlight_device_unregister >>> referenced by intel_backlight.c:999 >>> vmlinux.o:(intel_backlight_device_unregister) This issue occurred because intel_backlight_device_register and intel_backlight_device_unregister were enclosed within \#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) and #endif directives. However, according to Kconfig, CONFIG_DRM_I915 will select BACKLIGHT_CLASS_DEVICE only if ACPI is enabled. This led to an error when ACPI is not enabled. Change IS_ENABLED to IS_REACHABLE and use IS_REACHABLE to encompass the implementation of intel_connector_register() to solve this issue. Signed-off-by: Wang Jinchao --- drivers/gpu/drm/i915/display/intel_backlight.c | 2 +- drivers/gpu/drm/i915/display/intel_backlight.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/d= rm/i915/display/intel_backlight.c index 2e8f17c04522..d812cdc74a84 100644 --- a/drivers/gpu/drm/i915/display/intel_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_backlight.c @@ -795,7 +795,7 @@ void intel_backlight_enable(const struct intel_crtc_sta= te *crtc_state, mutex_unlock(&i915->display.backlight.lock); } =20 -#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) +#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE) static u32 intel_panel_get_backlight(struct intel_connector *connector) { struct drm_i915_private *i915 =3D to_i915(connector->base.dev); diff --git a/drivers/gpu/drm/i915/display/intel_backlight.h b/drivers/gpu/d= rm/i915/display/intel_backlight.h index 339643f63897..207fe1c613d8 100644 --- a/drivers/gpu/drm/i915/display/intel_backlight.h +++ b/drivers/gpu/drm/i915/display/intel_backlight.h @@ -36,7 +36,7 @@ u32 intel_backlight_invert_pwm_level(struct intel_connect= or *connector, u32 leve u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 le= vel); u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 = val); =20 -#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) +#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE) int intel_backlight_device_register(struct intel_connector *connector); void intel_backlight_device_unregister(struct intel_connector *connector); #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */ --=20 2.40.0