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charset="utf-8" DRM_MSM unconditionally selects QCOM_UBWC_CONFIG, which calls SMEM APIs, causing a link error on non-Qcom platforms (e.g. SOC_IMX5): arm-linux-gnueabihf-ld: ubwc_config.c:(.text+0x2c): undefined reference to 'qcom_smem_is_available' arm-linux-gnueabihf-ld: ubwc_config.c:(.text+0x4c): undefined reference to 'qcom_smem_dram_get_hbb' Make QCOM_UBWC_CONFIG depend on QCOM_SMEM to make the requirement explicit, and guard the select in DRM_MSM with ARCH_QCOM && QCOM_SMEM so it is only selected when its dependency is met. Fixes: 1b445022d1d0 ("soc: qcom: ubwc: Get HBB from SMEM") Signed-off-by: Daniel Baluta --- drivers/gpu/drm/msm/Kconfig | 2 +- drivers/soc/qcom/Kconfig | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig index 09469d56513b0..1670dbc9464c6 100644 --- a/drivers/gpu/drm/msm/Kconfig +++ b/drivers/gpu/drm/msm/Kconfig @@ -22,7 +22,7 @@ config DRM_MSM select TMPFS select QCOM_SCM select QCOM_PAS - select QCOM_UBWC_CONFIG + select QCOM_UBWC_CONFIG if ARCH_QCOM && QCOM_SMEM select WANT_DEV_COREDUMP select SND_SOC_HDMI_CODEC if SND_SOC select SYNC_FILE diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig index fd4d4ecd2df0f..e0629e9328c87 100644 --- a/drivers/soc/qcom/Kconfig +++ b/drivers/soc/qcom/Kconfig @@ -321,6 +321,7 @@ config QCOM_QMI_HELPERS =20 config QCOM_UBWC_CONFIG tristate + depends on QCOM_SMEM help Most Qualcomm SoCs feature a number of Universal Bandwidth Compression (UBWC) engines across various IP blocks, which need to be initialized --=20 2.45.2 From nobody Tue Sep 29 04:11:29 2026 Received: from DU2PR03CU002.outbound.protection.outlook.com (mail-northeuropeazon11011062.outbound.protection.outlook.com [52.101.65.62]) (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 84401470438; 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charset="utf-8" VIDEO_QCOM_IRIS unconditionally selects QCOM_UBWC_CONFIG, violating the Kconfig rule that a selecting symbol must carry all dependencies of the selected one. QCOM_UBWC_CONFIG now depends on QCOM_SMEM, so with COMPILE_TEST and QCOM_SMEM=3Dn Kconfig forces QCOM_UBWC_CONFIG=3Dy and the build fails with an undefined reference to qcom_smem_is_available. Guard the select the same way DRM_MSM already does. Fixes: c43207553867 ("media: iris: retrieve UBWC platform configuration") Signed-off-by: Daniel Baluta --- drivers/media/platform/qcom/iris/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/qcom/iris/Kconfig b/drivers/media/platf= orm/qcom/iris/Kconfig index 388c9bbc81365..04a4440a2dd51 100644 --- a/drivers/media/platform/qcom/iris/Kconfig +++ b/drivers/media/platform/qcom/iris/Kconfig @@ -6,7 +6,7 @@ config VIDEO_QCOM_IRIS select QCOM_MDT_LOADER select QCOM_SCM select QCOM_PAS - select QCOM_UBWC_CONFIG + select QCOM_UBWC_CONFIG if ARCH_QCOM && QCOM_SMEM select VIDEOBUF2_DMA_CONTIG help This is a V4L2 driver for Qualcomm iris video accelerator --=20 2.45.2 From nobody Tue Sep 29 04:11:29 2026 Received: from DU2PR03CU002.outbound.protection.outlook.com (mail-northeuropeazon11011062.outbound.protection.outlook.com [52.101.65.62]) (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 3A08E47141E; 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Received: from GVXPR04MB12316.eurprd04.prod.outlook.com (2603:10a6:150:2c6::8) by GV2PR04MB12019.eurprd04.prod.outlook.com (2603:10a6:150:30c::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.13; Wed, 12 Aug 2026 15:16:19 +0000 Received: from GVXPR04MB12316.eurprd04.prod.outlook.com ([fe80::fc6e:ca22:f065:def4]) by GVXPR04MB12316.eurprd04.prod.outlook.com ([fe80::fc6e:ca22:f065:def4%5]) with mapi id 15.21.0292.024; Wed, 12 Aug 2026 15:16:19 +0000 From: Daniel Baluta To: andersson@kernel.org, konradybcio@kernel.org Cc: robin.clark@oss.qualcomm.com, dmitry.baryshkov@oss.qualcomm.com, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, nathan@kernel.org, imx@lists.linux.dev, Daniel Baluta Subject: [PATCH v4 3/3] soc: qcom: ubwc: Use IS_REACHABLE() instead of IS_ENABLED() Date: Wed, 12 Aug 2026 18:19:34 +0300 Message-ID: <20260812151934.709198-4-daniel.baluta@nxp.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260812151934.709198-1-daniel.baluta@nxp.com> References: <20260812151934.709198-1-daniel.baluta@nxp.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: AM8P190CA0013.EURP190.PROD.OUTLOOK.COM (2603:10a6:20b:219::18) To GVXPR04MB12316.eurprd04.prod.outlook.com (2603:10a6:150:2c6::8) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GVXPR04MB12316:EE_|GV2PR04MB12019:EE_ X-MS-Office365-Filtering-Correlation-Id: 56f88a24-ba68-44ec-d850-08def884a919 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|23010399003|19092799006|6133799003|18002099003|22082099003|11063799006|56012099006|10067099003; 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charset="utf-8" When DRM_MSM=3Dy and QCOM_SMEM=3Dm, the conditional select evaluates to 'm' so QCOM_UBWC_CONFIG=3Dm. IS_ENABLED() is true for both =3Dy and =3Dm, so t= he real qcom_ubwc_config_get_data() declaration is exposed to built-in callers, which cannot resolve it at vmlinux link time. IS_REACHABLE() is false when the caller is built-in and the dependency is only a module, causing the inline stub to be used instead. Fixes: 1b445022d1d0 ("soc: qcom: ubwc: Get HBB from SMEM") Signed-off-by: Daniel Baluta --- include/linux/soc/qcom/ubwc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/soc/qcom/ubwc.h b/include/linux/soc/qcom/ubwc.h index a7372d9c25fbc..1a61238f6d4d5 100644 --- a/include/linux/soc/qcom/ubwc.h +++ b/include/linux/soc/qcom/ubwc.h @@ -36,7 +36,7 @@ struct qcom_ubwc_cfg_data { #define UBWC_5_0 0x50000000 #define UBWC_6_0 0x60000000 =20 -#if IS_ENABLED(CONFIG_QCOM_UBWC_CONFIG) +#if IS_REACHABLE(CONFIG_QCOM_UBWC_CONFIG) const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(void); #else static inline const struct qcom_ubwc_cfg_data *qcom_ubwc_config_get_data(v= oid) --=20 2.45.2